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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-06 09:30:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-06 09:30:52 -0700
commit4aed2fd8e3181fea7c09ba79cf64e7e3f4413bf9 (patch)
tree1f69733e5daab4915a76a41de0e4d1dc61e12cfb /kernel/trace
parent3a3527b6461b1298cc53ce72f336346739297ac8 (diff)
parentfc9ea5a1e53ee54f681e226d735008e2a6f8f470 (diff)
downloadop-kernel-dev-4aed2fd8e3181fea7c09ba79cf64e7e3f4413bf9.zip
op-kernel-dev-4aed2fd8e3181fea7c09ba79cf64e7e3f4413bf9.tar.gz
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (162 commits) tracing/kprobes: unregister_trace_probe needs to be called under mutex perf: expose event__process function perf events: Fix mmap offset determination perf, powerpc: fsl_emb: Restore setting perf_sample_data.period perf, powerpc: Convert the FSL driver to use local64_t perf tools: Don't keep unreferenced maps when unmaps are detected perf session: Invalidate last_match when removing threads from rb_tree perf session: Free the ref_reloc_sym memory at the right place x86,mmiotrace: Add support for tracing STOS instruction perf, sched migration: Librarize task states and event headers helpers perf, sched migration: Librarize the GUI class perf, sched migration: Make the GUI class client agnostic perf, sched migration: Make it vertically scrollable perf, sched migration: Parameterize cpu height and spacing perf, sched migration: Fix key bindings perf, sched migration: Ignore unhandled task states perf, sched migration: Handle ignored migrate out events perf: New migration tool overview tracing: Drop cpparg() macro perf: Use tracepoint_synchronize_unregister() to flush any pending tracepoint call ... Fix up trivial conflicts in Makefile and drivers/cpufreq/cpufreq.c
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/Kconfig68
-rw-r--r--kernel/trace/Makefile4
-rw-r--r--kernel/trace/ftrace.c5
-rw-r--r--kernel/trace/kmemtrace.c529
-rw-r--r--kernel/trace/ring_buffer.c40
-rw-r--r--kernel/trace/trace.c127
-rw-r--r--kernel/trace/trace.h90
-rw-r--r--kernel/trace/trace_boot.c185
-rw-r--r--kernel/trace/trace_clock.c5
-rw-r--r--kernel/trace/trace_entries.h94
-rw-r--r--kernel/trace/trace_event_perf.c27
-rw-r--r--kernel/trace/trace_events.c299
-rw-r--r--kernel/trace/trace_events_filter.c27
-rw-r--r--kernel/trace/trace_export.c8
-rw-r--r--kernel/trace/trace_functions.c6
-rw-r--r--kernel/trace/trace_functions_graph.c3
-rw-r--r--kernel/trace/trace_irqsoff.c3
-rw-r--r--kernel/trace/trace_kprobe.c383
-rw-r--r--kernel/trace/trace_ksym.c508
-rw-r--r--kernel/trace/trace_output.c69
-rw-r--r--kernel/trace/trace_sched_wakeup.c7
-rw-r--r--kernel/trace/trace_selftest.c87
-rw-r--r--kernel/trace/trace_stack.c6
-rw-r--r--kernel/trace/trace_syscalls.c7
-rw-r--r--kernel/trace/trace_sysprof.c329
25 files changed, 572 insertions, 2344 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8b1797c..c7683fd 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -194,15 +194,6 @@ config PREEMPT_TRACER
enabled. This option and the irqs-off timing option can be
used together or separately.)
-config SYSPROF_TRACER
- bool "Sysprof Tracer"
- depends on X86
- select GENERIC_TRACER
- select CONTEXT_SWITCH_TRACER
- help
- This tracer provides the trace needed by the 'Sysprof' userspace
- tool.
-
config SCHED_TRACER
bool "Scheduling Latency Tracer"
select GENERIC_TRACER
@@ -229,23 +220,6 @@ config FTRACE_SYSCALLS
help
Basic tracer to catch the syscall entry and exit events.
-config BOOT_TRACER
- bool "Trace boot initcalls"
- select GENERIC_TRACER
- select CONTEXT_SWITCH_TRACER
- help
- This tracer helps developers to optimize boot times: it records
- the timings of the initcalls and traces key events and the identity
- of tasks that can cause boot delays, such as context-switches.
-
- Its aim is to be parsed by the scripts/bootgraph.pl tool to
- produce pretty graphics about boot inefficiencies, giving a visual
- representation of the delays during initcalls - but the raw
- /debug/tracing/trace text output is readable too.
-
- You must pass in initcall_debug and ftrace=initcall to the kernel
- command line to enable this on bootup.
-
config TRACE_BRANCH_PROFILING
bool
select GENERIC_TRACER
@@ -325,28 +299,6 @@ config BRANCH_TRACER
Say N if unsure.
-config KSYM_TRACER
- bool "Trace read and write access on kernel memory locations"
- depends on HAVE_HW_BREAKPOINT
- select TRACING
- help
- This tracer helps find read and write operations on any given kernel
- symbol i.e. /proc/kallsyms.
-
-config PROFILE_KSYM_TRACER
- bool "Profile all kernel memory accesses on 'watched' variables"
- depends on KSYM_TRACER
- help
- This tracer profiles kernel accesses on variables watched through the
- ksym tracer ftrace plugin. Depending upon the hardware, all read
- and write operations on kernel variables can be monitored for
- accesses.
-
- The results will be displayed in:
- /debugfs/tracing/profile_ksym
-
- Say N if unsure.
-
config STACK_TRACER
bool "Trace max stack"
depends on HAVE_FUNCTION_TRACER
@@ -371,26 +323,6 @@ config STACK_TRACER
Say N if unsure.
-config KMEMTRACE
- bool "Trace SLAB allocations"
- select GENERIC_TRACER
- help
- kmemtrace provides tracing for slab allocator functions, such as
- kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
- data is then fed to the userspace application in order to analyse
- allocation hotspots, internal fragmentation and so on, making it
- possible to see how well an allocator performs, as well as debug
- and profile kernel code.
-
- This requires an userspace application to use. See
- Documentation/trace/kmemtrace.txt for more information.
-
- Saying Y will make the kernel somewhat larger and slower. However,
- if you disable kmemtrace at run-time or boot-time, the performance
- impact is minimal (depending on the arch the kernel is built for).
-
- If unsure, say N.
-
config WORKQUEUE_TRACER
bool "Trace workqueues"
select GENERIC_TRACER
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 4215530..53f3381 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_TRACING) += trace_output.o
obj-$(CONFIG_TRACING) += trace_stat.o
obj-$(CONFIG_TRACING) += trace_printk.o
obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
-obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
@@ -38,10 +37,8 @@ obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
obj-$(CONFIG_NOP_TRACER) += trace_nop.o
obj-$(CONFIG_STACK_TRACER) += trace_stack.o
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
-obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
-obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
ifeq ($(CONFIG_BLOCK),y)
@@ -55,7 +52,6 @@ obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
endif
obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
-obj-$(CONFIG_KSYM_TRACER) += trace_ksym.o
obj-$(CONFIG_EVENT_TRACING) += power-traces.o
ifeq ($(CONFIG_TRACING),y)
obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 6d2cb14..0d88ce9 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1883,7 +1883,6 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
struct hlist_head *hhd;
struct hlist_node *n;
unsigned long key;
- int resched;
key = hash_long(ip, FTRACE_HASH_BITS);
@@ -1897,12 +1896,12 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
* period. This syncs the hash iteration and freeing of items
* on the hash. rcu_read_lock is too dangerous here.
*/
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
hlist_for_each_entry_rcu(entry, n, hhd, node) {
if (entry->ip == ip)
entry->ops->func(ip, parent_ip, &entry->data);
}
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
}
static struct ftrace_ops trace_probe_ops __read_mostly =
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
deleted file mode 100644
index bbfc1bb..0000000
--- a/kernel/trace/kmemtrace.c
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * Memory allocator tracing
- *
- * Copyright (C) 2008 Eduard - Gabriel Munteanu
- * Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- */
-
-#include <linux/tracepoint.h>
-#include <linux/seq_file.h>
-#include <linux/debugfs.h>
-#include <linux/dcache.h>
-#include <linux/fs.h>
-
-#include <linux/kmemtrace.h>
-
-#include "trace_output.h"
-#include "trace.h"
-
-/* Select an alternative, minimalistic output than the original one */
-#define TRACE_KMEM_OPT_MINIMAL 0x1
-
-static struct tracer_opt kmem_opts[] = {
- /* Default disable the minimalistic output */
- { TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
- { }
-};
-
-static struct tracer_flags kmem_tracer_flags = {
- .val = 0,
- .opts = kmem_opts
-};
-
-static struct trace_array *kmemtrace_array;
-
-/* Trace allocations */
-static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
- unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags,
- int node)
-{
- struct ftrace_event_call *call = &event_kmem_alloc;
- struct trace_array *tr = kmemtrace_array;
- struct kmemtrace_alloc_entry *entry;
- struct ring_buffer_event *event;
-
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
- if (!event)
- return;
-
- entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, 0, 0);
-
- entry->ent.type = TRACE_KMEM_ALLOC;
- entry->type_id = type_id;
- entry->call_site = call_site;
- entry->ptr = ptr;
- entry->bytes_req = bytes_req;
- entry->bytes_alloc = bytes_alloc;
- entry->gfp_flags = gfp_flags;
- entry->node = node;
-
- if (!filter_check_discard(call, entry, tr->buffer, event))
- ring_buffer_unlock_commit(tr->buffer, event);
-
- trace_wake_up();
-}
-
-static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
- unsigned long call_site,
- const void *ptr)
-{
- struct ftrace_event_call *call = &event_kmem_free;
- struct trace_array *tr = kmemtrace_array;
- struct kmemtrace_free_entry *entry;
- struct ring_buffer_event *event;
-
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
- if (!event)
- return;
- entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, 0, 0);
-
- entry->ent.type = TRACE_KMEM_FREE;
- entry->type_id = type_id;
- entry->call_site = call_site;
- entry->ptr = ptr;
-
- if (!filter_check_discard(call, entry, tr->buffer, event))
- ring_buffer_unlock_commit(tr->buffer, event);
-
- trace_wake_up();
-}
-
-static void kmemtrace_kmalloc(void *ignore,
- unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags)
-{
- kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
- bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmem_cache_alloc(void *ignore,
- unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags)
-{
- kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
- bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmalloc_node(void *ignore,
- unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags,
- int node)
-{
- kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
- bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void kmemtrace_kmem_cache_alloc_node(void *ignore,
- unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags,
- int node)
-{
- kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
- bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void
-kmemtrace_kfree(void *ignore, unsigned long call_site, const void *ptr)
-{
- kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
-}
-
-static void kmemtrace_kmem_cache_free(void *ignore,
- unsigned long call_site, const void *ptr)
-{
- kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
-}
-
-static int kmemtrace_start_probes(void)
-{
- int err;
-
- err = register_trace_kmalloc(kmemtrace_kmalloc, NULL);
- if (err)
- return err;
- err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
- if (err)
- return err;
- err = register_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
- if (err)
- return err;
- err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
- if (err)
- return err;
- err = register_trace_kfree(kmemtrace_kfree, NULL);
- if (err)
- return err;
- err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-
- return err;
-}
-
-static void kmemtrace_stop_probes(void)
-{
- unregister_trace_kmalloc(kmemtrace_kmalloc, NULL);
- unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
- unregister_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
- unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
- unregister_trace_kfree(kmemtrace_kfree, NULL);
- unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-}
-
-static int kmem_trace_init(struct trace_array *tr)
-{
- kmemtrace_array = tr;
-
- tracing_reset_online_cpus(tr);
-
- kmemtrace_start_probes();
-
- return 0;
-}
-
-static void kmem_trace_reset(struct trace_array *tr)
-{
- kmemtrace_stop_probes();
-}
-
-static void kmemtrace_headers(struct seq_file *s)
-{
- /* Don't need headers for the original kmemtrace output */
- if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
- return;
-
- seq_printf(s, "#\n");
- seq_printf(s, "# ALLOC TYPE REQ GIVEN FLAGS "
- " POINTER NODE CALLER\n");
- seq_printf(s, "# FREE | | | | "
- " | | | |\n");
- seq_printf(s, "# |\n\n");
-}
-
-/*
- * The following functions give the original output from kmemtrace,
- * plus the origin CPU, since reordering occurs in-kernel now.
- */
-
-#define KMEMTRACE_USER_ALLOC 0
-#define KMEMTRACE_USER_FREE 1
-
-struct kmemtrace_user_event {
- u8 event_id;
- u8 type_id;
- u16 event_size;
- u32 cpu;
- u64 timestamp;
- unsigned long call_site;
- unsigned long ptr;
-};
-
-struct kmemtrace_user_event_alloc {
- size_t bytes_req;
- size_t bytes_alloc;
- unsigned gfp_flags;
- int node;
-};
-
-static enum print_line_t
-kmemtrace_print_alloc(struct trace_iterator *iter, int flags,
- struct trace_event *event)
-{
- struct trace_seq *s = &iter->seq;
- struct kmemtrace_alloc_entry *entry;
- int ret;
-
- trace_assign_type(entry, iter->ent);
-
- ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu "
- "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
- entry->type_id, (void *)entry->call_site, (unsigned long)entry->ptr,
- (unsigned long)entry->bytes_req, (unsigned long)entry->bytes_alloc,
- (unsigned long)entry->gfp_flags, entry->node);
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free(struct trace_iterator *iter, int flags,
- struct trace_event *event)
-{
- struct trace_seq *s = &iter->seq;
- struct kmemtrace_free_entry *entry;
- int ret;
-
- trace_assign_type(entry, iter->ent);
-
- ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu\n",
- entry->type_id, (void *)entry->call_site,
- (unsigned long)entry->ptr);
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_alloc_user(struct trace_iterator *iter, int flags,
- struct trace_event *event)
-{
- struct trace_seq *s = &iter->seq;
- struct kmemtrace_alloc_entry *entry;
- struct kmemtrace_user_event *ev;
- struct kmemtrace_user_event_alloc *ev_alloc;
-
- trace_assign_type(entry, iter->ent);
-
- ev = trace_seq_reserve(s, sizeof(*ev));
- if (!ev)
- return TRACE_TYPE_PARTIAL_LINE;
-
- ev->event_id = KMEMTRACE_USER_ALLOC;
- ev->type_id = entry->type_id;
- ev->event_size = sizeof(*ev) + sizeof(*ev_alloc);
- ev->cpu = iter->cpu;
- ev->timestamp = iter->ts;
- ev->call_site = entry->call_site;
- ev->ptr = (unsigned long)entry->ptr;
-
- ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
- if (!ev_alloc)
- return TRACE_TYPE_PARTIAL_LINE;
-
- ev_alloc->bytes_req = entry->bytes_req;
- ev_alloc->bytes_alloc = entry->bytes_alloc;
- ev_alloc->gfp_flags = entry->gfp_flags;
- ev_alloc->node = entry->node;
-
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_user(struct trace_iterator *iter, int flags,
- struct trace_event *event)
-{
- struct trace_seq *s = &iter->seq;
- struct kmemtrace_free_entry *entry;
- struct kmemtrace_user_event *ev;
-
- trace_assign_type(entry, iter->ent);
-
- ev = trace_seq_reserve(s, sizeof(*ev));
- if (!ev)
- return TRACE_TYPE_PARTIAL_LINE;
-
- ev->event_id = KMEMTRACE_USER_FREE;
- ev->type_id = entry->type_id;
- ev->event_size = sizeof(*ev);
- ev->cpu = iter->cpu;
- ev->timestamp = iter->ts;
- ev->call_site = entry->call_site;
- ev->ptr = (unsigned long)entry->ptr;
-
- return TRACE_TYPE_HANDLED;
-}
-
-/* The two other following provide a more minimalistic output */
-static enum print_line_t
-kmemtrace_print_alloc_compress(struct trace_iterator *iter)
-{
- struct kmemtrace_alloc_entry *entry;
- struct trace_seq *s = &iter->seq;
- int ret;
-
- trace_assign_type(entry, iter->ent);
-
- /* Alloc entry */
- ret = trace_seq_printf(s, " + ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Type */
- switch (entry->type_id) {
- case KMEMTRACE_TYPE_KMALLOC:
- ret = trace_seq_printf(s, "K ");
- break;
- case KMEMTRACE_TYPE_CACHE:
- ret = trace_seq_printf(s, "C ");
- break;
- case KMEMTRACE_TYPE_PAGES:
- ret = trace_seq_printf(s, "P ");
- break;
- default:
- ret = trace_seq_printf(s, "? ");
- }
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Requested */
- ret = trace_seq_printf(s, "%4zu ", entry->bytes_req);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Allocated */
- ret = trace_seq_printf(s, "%4zu ", entry->bytes_alloc);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Flags
- * TODO: would be better to see the name of the GFP flag names
- */
- ret = trace_seq_printf(s, "%08x ", entry->gfp_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Pointer to allocated */
- ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Node and call site*/
- ret = trace_seq_printf(s, "%4d %pf\n", entry->node,
- (void *)entry->call_site);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_compress(struct trace_iterator *iter)
-{
- struct kmemtrace_free_entry *entry;
- struct trace_seq *s = &iter->seq;
- int ret;
-
- trace_assign_type(entry, iter->ent);
-
- /* Free entry */
- ret = trace_seq_printf(s, " - ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Type */
- switch (entry->type_id) {
- case KMEMTRACE_TYPE_KMALLOC:
- ret = trace_seq_printf(s, "K ");
- break;
- case KMEMTRACE_TYPE_CACHE:
- ret = trace_seq_printf(s, "C ");
- break;
- case KMEMTRACE_TYPE_PAGES:
- ret = trace_seq_printf(s, "P ");
- break;
- default:
- ret = trace_seq_printf(s, "? ");
- }
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Skip requested/allocated/flags */
- ret = trace_seq_printf(s, " ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Pointer to allocated */
- ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Skip node and print call site*/
- ret = trace_seq_printf(s, " %pf\n", (void *)entry->call_site);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
-{
- struct trace_entry *entry = iter->ent;
-
- if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
- return TRACE_TYPE_UNHANDLED;
-
- switch (entry->type) {
- case TRACE_KMEM_ALLOC:
- return kmemtrace_print_alloc_compress(iter);
- case TRACE_KMEM_FREE:
- return kmemtrace_print_free_compress(iter);
- default:
- return TRACE_TYPE_UNHANDLED;
- }
-}
-
-static struct trace_event_functions kmem_trace_alloc_funcs = {
- .trace = kmemtrace_print_alloc,
- .binary = kmemtrace_print_alloc_user,
-};
-
-static struct trace_event kmem_trace_alloc = {
- .type = TRACE_KMEM_ALLOC,
- .funcs = &kmem_trace_alloc_funcs,
-};
-
-static struct trace_event_functions kmem_trace_free_funcs = {
- .trace = kmemtrace_print_free,
- .binary = kmemtrace_print_free_user,
-};
-
-static struct trace_event kmem_trace_free = {
- .type = TRACE_KMEM_FREE,
- .funcs = &kmem_trace_free_funcs,
-};
-
-static struct tracer kmem_tracer __read_mostly = {
- .name = "kmemtrace",
- .init = kmem_trace_init,
- .reset = kmem_trace_reset,
- .print_line = kmemtrace_print_line,
- .print_header = kmemtrace_headers,
- .flags = &kmem_tracer_flags
-};
-
-void kmemtrace_init(void)
-{
- /* earliest opportunity to start kmem tracing */
-}
-
-static int __init init_kmem_tracer(void)
-{
- if (!register_ftrace_event(&kmem_trace_alloc)) {
- pr_warning("Warning: could not register kmem events\n");
- return 1;
- }
-
- if (!register_ftrace_event(&kmem_trace_free)) {
- pr_warning("Warning: could not register kmem events\n");
- return 1;
- }
-
- if (register_tracer(&kmem_tracer) != 0) {
- pr_warning("Warning: could not register the kmem tracer\n");
- return 1;
- }
-
- return 0;
-}
-device_initcall(init_kmem_tracer);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 1da7b6e..3632ce8 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -443,6 +443,7 @@ int ring_buffer_print_page_header(struct trace_seq *s)
*/
struct ring_buffer_per_cpu {
int cpu;
+ atomic_t record_disabled;
struct ring_buffer *buffer;
spinlock_t reader_lock; /* serialize readers */
arch_spinlock_t lock;
@@ -462,7 +463,6 @@ struct ring_buffer_per_cpu {
unsigned long read;
u64 write_stamp;
u64 read_stamp;
- atomic_t record_disabled;
};
struct ring_buffer {
@@ -2242,8 +2242,6 @@ static void trace_recursive_unlock(void)
#endif
-static DEFINE_PER_CPU(int, rb_need_resched);
-
/**
* ring_buffer_lock_reserve - reserve a part of the buffer
* @buffer: the ring buffer to reserve from
@@ -2264,13 +2262,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
{
struct ring_buffer_per_cpu *cpu_buffer;
struct ring_buffer_event *event;
- int cpu, resched;
+ int cpu;
if (ring_buffer_flags != RB_BUFFERS_ON)
return NULL;
/* If we are tracing schedule, we don't want to recurse */
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
if (atomic_read(&buffer->record_disabled))
goto out_nocheck;
@@ -2295,21 +2293,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
if (!event)
goto out;
- /*
- * Need to store resched state on this cpu.
- * Only the first needs to.
- */
-
- if (preempt_count() == 1)
- per_cpu(rb_need_resched, cpu) = resched;
-
return event;
out:
trace_recursive_unlock();
out_nocheck:
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
@@ -2355,13 +2345,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
trace_recursive_unlock();
- /*
- * Only the last preempt count needs to restore preemption.
- */
- if (preempt_count() == 1)
- ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
- else
- preempt_enable_no_resched_notrace();
+ preempt_enable_notrace();
return 0;
}
@@ -2469,13 +2453,7 @@ void ring_buffer_discard_commit(struct ring_buffer *buffer,
trace_recursive_unlock();
- /*
- * Only the last preempt count needs to restore preemption.
- */
- if (preempt_count() == 1)
- ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
- else
- preempt_enable_no_resched_notrace();
+ preempt_enable_notrace();
}
EXPORT_SYMBOL_GPL(ring_buffer_discard_commit);
@@ -2501,12 +2479,12 @@ int ring_buffer_write(struct ring_buffer *buffer,
struct ring_buffer_event *event;
void *body;
int ret = -EBUSY;
- int cpu, resched;
+ int cpu;
if (ring_buffer_flags != RB_BUFFERS_ON)
return -EBUSY;
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
if (atomic_read(&buffer->record_disabled))
goto out;
@@ -2536,7 +2514,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
ret = 0;
out:
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
return ret;
}
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d6736b9..ed1032d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -341,7 +341,7 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
/* trace_flags holds trace_options default values */
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
- TRACE_ITER_GRAPH_TIME;
+ TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD;
static int trace_stop_count;
static DEFINE_SPINLOCK(tracing_start_lock);
@@ -425,6 +425,7 @@ static const char *trace_options[] = {
"latency-format",
"sleep-time",
"graph-time",
+ "record-cmd",
NULL
};
@@ -656,6 +657,10 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
return;
WARN_ON_ONCE(!irqs_disabled());
+ if (!current_trace->use_max_tr) {
+ WARN_ON_ONCE(1);
+ return;
+ }
arch_spin_lock(&ftrace_max_lock);
tr->buffer = max_tr.buffer;
@@ -682,6 +687,11 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
return;
WARN_ON_ONCE(!irqs_disabled());
+ if (!current_trace->use_max_tr) {
+ WARN_ON_ONCE(1);
+ return;
+ }
+
arch_spin_lock(&ftrace_max_lock);
ftrace_disable_cpu();
@@ -726,7 +736,7 @@ __acquires(kernel_lock)
return -1;
}
- if (strlen(type->name) > MAX_TRACER_SIZE) {
+ if (strlen(type->name) >= MAX_TRACER_SIZE) {
pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE);
return -1;
}
@@ -1328,61 +1338,6 @@ static void __trace_userstack(struct trace_array *tr, unsigned long flags)
#endif /* CONFIG_STACKTRACE */
-static void
-ftrace_trace_special(void *__tr,
- unsigned long arg1, unsigned long arg2, unsigned long arg3,
- int pc)
-{
- struct ftrace_event_call *call = &event_special;
- struct ring_buffer_event *event;
- struct trace_array *tr = __tr;
- struct ring_buffer *buffer = tr->buffer;
- struct special_entry *entry;
-
- event = trace_buffer_lock_reserve(buffer, TRACE_SPECIAL,
- sizeof(*entry), 0, pc);
- if (!event)
- return;
- entry = ring_buffer_event_data(event);
- entry->arg1 = arg1;
- entry->arg2 = arg2;
- entry->arg3 = arg3;
-
- if (!filter_check_discard(call, entry, buffer, event))
- trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-void
-__trace_special(void *__tr, void *__data,
- unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
- ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count());
-}
-
-void
-ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
- struct trace_array *tr = &global_trace;
- struct trace_array_cpu *data;
- unsigned long flags;
- int cpu;
- int pc;
-
- if (tracing_disabled)
- return;
-
- pc = preempt_count();
- local_irq_save(flags);
- cpu = raw_smp_processor_id();
- data = tr->data[cpu];
-
- if (likely(atomic_inc_return(&data->disabled) == 1))
- ftrace_trace_special(tr, arg1, arg2, arg3, pc);
-
- atomic_dec(&data->disabled);
- local_irq_restore(flags);
-}
-
/**
* trace_vbprintk - write binary msg to tracing buffer
*
@@ -1401,7 +1356,6 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
struct bprint_entry *entry;
unsigned long flags;
int disable;
- int resched;
int cpu, len = 0, size, pc;
if (unlikely(tracing_selftest_running || tracing_disabled))
@@ -1411,7 +1365,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
pause_graph_tracing();
pc = preempt_count();
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
cpu = raw_smp_processor_id();
data = tr->data[cpu];
@@ -1449,7 +1403,7 @@ out_unlock:
out:
atomic_dec_return(&data->disabled);
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
unpause_graph_tracing();
return len;
@@ -2386,6 +2340,7 @@ static const struct file_operations show_traces_fops = {
.open = show_traces_open,
.read = seq_read,
.release = seq_release,
+ .llseek = seq_lseek,
};
/*
@@ -2479,6 +2434,7 @@ static const struct file_operations tracing_cpumask_fops = {
.open = tracing_open_generic,
.read = tracing_cpumask_read,
.write = tracing_cpumask_write,
+ .llseek = generic_file_llseek,
};
static int tracing_trace_options_show(struct seq_file *m, void *v)
@@ -2554,6 +2510,9 @@ static void set_tracer_flags(unsigned int mask, int enabled)
trace_flags |= mask;
else
trace_flags &= ~mask;
+
+ if (mask == TRACE_ITER_RECORD_CMD)
+ trace_event_enable_cmd_record(enabled);
}
static ssize_t
@@ -2645,6 +2604,7 @@ tracing_readme_read(struct file *filp, char __user *ubuf,
static const struct file_operations tracing_readme_fops = {
.open = tracing_open_generic,
.read = tracing_readme_read,
+ .llseek = generic_file_llseek,
};
static ssize_t
@@ -2695,6 +2655,7 @@ tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
static const struct file_operations tracing_saved_cmdlines_fops = {
.open = tracing_open_generic,
.read = tracing_saved_cmdlines_read,
+ .llseek = generic_file_llseek,
};
static ssize_t
@@ -2790,6 +2751,9 @@ static int tracing_resize_ring_buffer(unsigned long size)
if (ret < 0)
return ret;
+ if (!current_trace->use_max_tr)
+ goto out;
+
ret = ring_buffer_resize(max_tr.buffer, size);
if (ret < 0) {
int r;
@@ -2817,11 +2781,14 @@ static int tracing_resize_ring_buffer(unsigned long size)
return ret;
}
+ max_tr.entries = size;
+ out:
global_trace.entries = size;
return ret;
}
+
/**
* tracing_update_buffers - used by tracing facility to expand ring buffers
*
@@ -2882,12 +2849,26 @@ static int tracing_set_tracer(const char *buf)
trace_branch_disable();
if (current_trace && current_trace->reset)
current_trace->reset(tr);
-
+ if (current_trace && current_trace->use_max_tr) {
+ /*
+ * We don't free the ring buffer. instead, resize it because
+ * The max_tr ring buffer has some state (e.g. ring->clock) and
+ * we want preserve it.
+ */
+ ring_buffer_resize(max_tr.buffer, 1);
+ max_tr.entries = 1;
+ }
destroy_trace_option_files(topts);
current_trace = t;
topts = create_trace_option_files(current_trace);
+ if (current_trace->use_max_tr) {
+ ret = ring_buffer_resize(max_tr.buffer, global_trace.entries);
+ if (ret < 0)
+ goto out;
+ max_tr.entries = global_trace.entries;
+ }
if (t->init) {
ret = tracer_init(t, tr);
@@ -3024,6 +3005,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
if (iter->trace->pipe_open)
iter->trace->pipe_open(iter);
+ nonseekable_open(inode, filp);
out:
mutex_unlock(&trace_types_lock);
return ret;
@@ -3469,7 +3451,6 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
}
tracing_start();
- max_tr.entries = global_trace.entries;
mutex_unlock(&trace_types_lock);
return cnt;
@@ -3582,18 +3563,21 @@ static const struct file_operations tracing_max_lat_fops = {
.open = tracing_open_generic,
.read = tracing_max_lat_read,
.write = tracing_max_lat_write,
+ .llseek = generic_file_llseek,
};
static const struct file_operations tracing_ctrl_fops = {
.open = tracing_open_generic,
.read = tracing_ctrl_read,
.write = tracing_ctrl_write,
+ .llseek = generic_file_llseek,
};
static const struct file_operations set_tracer_fops = {
.open = tracing_open_generic,
.read = tracing_set_trace_read,
.write = tracing_set_trace_write,
+ .llseek = generic_file_llseek,
};
static const struct file_operations tracing_pipe_fops = {
@@ -3602,17 +3586,20 @@ static const struct file_operations tracing_pipe_fops = {
.read = tracing_read_pipe,
.splice_read = tracing_splice_read_pipe,
.release = tracing_release_pipe,
+ .llseek = no_llseek,
};
static const struct file_operations tracing_entries_fops = {
.open = tracing_open_generic,
.read = tracing_entries_read,
.write = tracing_entries_write,
+ .llseek = generic_file_llseek,
};
static const struct file_operations tracing_mark_fops = {
.open = tracing_open_generic,
.write = tracing_mark_write,
+ .llseek = generic_file_llseek,
};
static const struct file_operations trace_clock_fops = {
@@ -3918,6 +3905,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
static const struct file_operations tracing_stats_fops = {
.open = tracing_open_generic,
.read = tracing_stats_read,
+ .llseek = generic_file_llseek,
};
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -3954,6 +3942,7 @@ tracing_read_dyn_info(struct file *filp, char __user *ubuf,
static const struct file_operations tracing_dyn_info_fops = {
.open = tracing_open_generic,
.read = tracing_read_dyn_info,
+ .llseek = generic_file_llseek,
};
#endif
@@ -4107,6 +4096,7 @@ static const struct file_operations trace_options_fops = {
.open = tracing_open_generic,
.read = trace_options_read,
.write = trace_options_write,
+ .llseek = generic_file_llseek,
};
static ssize_t
@@ -4158,6 +4148,7 @@ static const struct file_operations trace_options_core_fops = {
.open = tracing_open_generic,
.read = trace_options_core_read,
.write = trace_options_core_write,
+ .llseek = generic_file_llseek,
};
struct dentry *trace_create_file(const char *name,
@@ -4347,9 +4338,6 @@ static __init int tracer_init_debugfs(void)
trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
#endif
-#ifdef CONFIG_SYSPROF_TRACER
- init_tracer_sysprof_debugfs(d_tracer);
-#endif
create_trace_options_dir();
@@ -4576,16 +4564,14 @@ __init static int tracer_alloc_buffers(void)
#ifdef CONFIG_TRACER_MAX_TRACE
- max_tr.buffer = ring_buffer_alloc(ring_buf_size,
- TRACE_BUFFER_FLAGS);
+ max_tr.buffer = ring_buffer_alloc(1, TRACE_BUFFER_FLAGS);
if (!max_tr.buffer) {
printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
WARN_ON(1);
ring_buffer_free(global_trace.buffer);
goto out_free_cpumask;
}
- max_tr.entries = ring_buffer_size(max_tr.buffer);
- WARN_ON(max_tr.entries != global_trace.entries);
+ max_tr.entries = 1;
#endif
/* Allocate the first page for all buffers */
@@ -4598,9 +4584,6 @@ __init static int tracer_alloc_buffers(void)
register_tracer(&nop_trace);
current_trace = &nop_trace;
-#ifdef CONFIG_BOOT_TRACER
- register_tracer(&boot_tracer);
-#endif
/* All seems OK, enable tracing */
tracing_disabled = 0;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 0605fc0..d39b3c5 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -9,10 +9,7 @@
#include <linux/mmiotrace.h>
#include <linux/tracepoint.h>
#include <linux/ftrace.h>
-#include <trace/boot.h>
-#include <linux/kmemtrace.h>
#include <linux/hw_breakpoint.h>
-
#include <linux/trace_seq.h>
#include <linux/ftrace_event.h>
@@ -25,30 +22,17 @@ enum trace_type {
TRACE_STACK,
TRACE_PRINT,
TRACE_BPRINT,
- TRACE_SPECIAL,
TRACE_MMIO_RW,
TRACE_MMIO_MAP,
TRACE_BRANCH,
- TRACE_BOOT_CALL,
- TRACE_BOOT_RET,
TRACE_GRAPH_RET,
TRACE_GRAPH_ENT,
TRACE_USER_STACK,
- TRACE_KMEM_ALLOC,
- TRACE_KMEM_FREE,
TRACE_BLK,
- TRACE_KSYM,
__TRACE_LAST_TYPE,
};
-enum kmemtrace_type_id {
- KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
- KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */
- KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
-};
-
-extern struct tracer boot_tracer;
#undef __field
#define __field(type, item) type item;
@@ -204,23 +188,15 @@ extern void __ftrace_bad_type(void);
IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
- IF_ASSIGN(var, ent, struct special_entry, 0); \
IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
TRACE_MMIO_RW); \
IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
TRACE_MMIO_MAP); \
- IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
- IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
TRACE_GRAPH_ENT); \
IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
TRACE_GRAPH_RET); \
- IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
- TRACE_KMEM_ALLOC); \
- IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
- TRACE_KMEM_FREE); \
- IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
__ftrace_bad_type(); \
} while (0)
@@ -298,6 +274,7 @@ struct tracer {
struct tracer *next;
int print_max;
struct tracer_flags *flags;
+ int use_max_tr;
};
@@ -318,7 +295,6 @@ struct dentry *trace_create_file(const char *name,
const struct file_operations *fops);
struct dentry *tracing_init_dentry(void);
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
struct ring_buffer_event;
@@ -363,11 +339,6 @@ void tracing_sched_wakeup_trace(struct trace_array *tr,
struct task_struct *wakee,
struct task_struct *cur,
unsigned long flags, int pc);
-void trace_special(struct trace_array *tr,
- struct trace_array_cpu *data,
- unsigned long arg1,
- unsigned long arg2,
- unsigned long arg3, int pc);
void trace_function(struct trace_array *tr,
unsigned long ip,
unsigned long parent_ip,
@@ -398,8 +369,6 @@ extern cpumask_var_t __read_mostly tracing_buffer_mask;
#define for_each_tracing_cpu(cpu) \
for_each_cpu(cpu, tracing_buffer_mask)
-extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
-
extern unsigned long nsecs_to_usecs(unsigned long nsecs);
extern unsigned long tracing_thresh;
@@ -469,12 +438,8 @@ extern int trace_selftest_startup_nop(struct tracer *trace,
struct trace_array *tr);
extern int trace_selftest_startup_sched_switch(struct tracer *trace,
struct trace_array *tr);
-extern int trace_selftest_startup_sysprof(struct tracer *trace,
- struct trace_array *tr);
extern int trace_selftest_startup_branch(struct tracer *trace,
struct trace_array *tr);
-extern int trace_selftest_startup_ksym(struct tracer *trace,
- struct trace_array *tr);
#endif /* CONFIG_FTRACE_STARTUP_TEST */
extern void *head_page(struct trace_array_cpu *data);
@@ -636,6 +601,7 @@ enum trace_iterator_flags {
TRACE_ITER_LATENCY_FMT = 0x20000,
TRACE_ITER_SLEEP_TIME = 0x40000,
TRACE_ITER_GRAPH_TIME = 0x80000,
+ TRACE_ITER_RECORD_CMD = 0x100000,
};
/*
@@ -647,54 +613,6 @@ enum trace_iterator_flags {
extern struct tracer nop_trace;
-/**
- * ftrace_preempt_disable - disable preemption scheduler safe
- *
- * When tracing can happen inside the scheduler, there exists
- * cases that the tracing might happen before the need_resched
- * flag is checked. If this happens and the tracer calls
- * preempt_enable (after a disable), a schedule might take place
- * causing an infinite recursion.
- *
- * To prevent this, we read the need_resched flag before
- * disabling preemption. When we want to enable preemption we
- * check the flag, if it is set, then we call preempt_enable_no_resched.
- * Otherwise, we call preempt_enable.
- *
- * The rational for doing the above is that if need_resched is set
- * and we have yet to reschedule, we are either in an atomic location
- * (where we do not need to check for scheduling) or we are inside
- * the scheduler and do not want to resched.
- */
-static inline int ftrace_preempt_disable(void)
-{
- int resched;
-
- resched = need_resched();
- preempt_disable_notrace();
-
- return resched;
-}
-
-/**
- * ftrace_preempt_enable - enable preemption scheduler safe
- * @resched: the return value from ftrace_preempt_disable
- *
- * This is a scheduler safe way to enable preemption and not miss
- * any preemption checks. The disabled saved the state of preemption.
- * If resched is set, then we are either inside an atomic or
- * are inside the scheduler (we would have already scheduled
- * otherwise). In this case, we do not want to call normal
- * preempt_enable, but preempt_enable_no_resched instead.
- */
-static inline void ftrace_preempt_enable(int resched)
-{
- if (resched)
- preempt_enable_no_resched_notrace();
- else
- preempt_enable_notrace();
-}
-
#ifdef CONFIG_BRANCH_TRACER
extern int enable_branch_tracing(struct trace_array *tr);
extern void disable_branch_tracing(void);
@@ -785,6 +703,8 @@ struct filter_pred {
int pop_n;
};
+extern struct list_head ftrace_common_fields;
+
extern enum regex_type
filter_parse_regex(char *buff, int len, char **search, int *not);
extern void print_event_filter(struct ftrace_event_call *call,
@@ -814,6 +734,8 @@ filter_check_discard(struct ftrace_event_call *call, void *rec,
return 0;
}
+extern void trace_event_enable_cmd_record(bool enable);
+
extern struct mutex event_mutex;
extern struct list_head ftrace_events;
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
deleted file mode 100644
index c21d5f3..0000000
--- a/kernel/trace/trace_boot.c
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- * ring buffer based initcalls tracer
- *
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- *
- */
-
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/kallsyms.h>
-#include <linux/time.h>
-
-#include "trace.h"
-#include "trace_output.h"
-
-static struct trace_array *boot_trace;
-static bool pre_initcalls_finished;
-
-/* Tells the boot tracer that the pre_smp_initcalls are finished.
- * So we are ready .
- * It doesn't enable sched events tracing however.
- * You have to call enable_boot_trace to do so.
- */
-void start_boot_trace(void)
-{
- pre_initcalls_finished = true;
-}
-
-void enable_boot_trace(void)
-{
- if (boot_trace && pre_initcalls_finished)
- tracing_start_sched_switch_record();
-}
-
-void disable_boot_trace(void)
-{
- if (boot_trace && pre_initcalls_finished)
- tracing_stop_sched_switch_record();
-}
-
-static int boot_trace_init(struct trace_array *tr)
-{
- boot_trace = tr;
-
- if (!tr)
- return 0;
-
- tracing_reset_online_cpus(tr);
-
- tracing_sched_switch_assign_trace(tr);
- return 0;
-}
-
-static enum print_line_t
-initcall_call_print_line(struct trace_iterator *iter)
-{
- struct trace_entry *entry = iter->ent;
- struct trace_seq *s = &iter->seq;
- struct trace_boot_call *field;
- struct boot_trace_call *call;
- u64 ts;
- unsigned long nsec_rem;
- int ret;
-
- trace_assign_type(field, entry);
- call = &field->boot_call;
- ts = iter->ts;
- nsec_rem = do_div(ts, NSEC_PER_SEC);
-
- ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n",
- (unsigned long)ts, nsec_rem, call->func, call->caller);
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- else
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-initcall_ret_print_line(struct trace_iterator *iter)
-{
- struct trace_entry *entry = iter->ent;
- struct trace_seq *s = &iter->seq;
- struct trace_boot_ret *field;
- struct boot_trace_ret *init_ret;
- u64 ts;
- unsigned long nsec_rem;
- int ret;
-
- trace_assign_type(field, entry);
- init_ret = &field->boot_ret;
- ts = iter->ts;
- nsec_rem = do_div(ts, NSEC_PER_SEC);
-
- ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
- "returned %d after %llu msecs\n",
- (unsigned long) ts,
- nsec_rem,
- init_ret->func, init_ret->result, init_ret->duration);
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- else
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t initcall_print_line(struct trace_iterator *iter)
-{
- struct trace_entry *entry = iter->ent;
-
- switch (entry->type) {
- case TRACE_BOOT_CALL:
- return initcall_call_print_line(iter);
- case TRACE_BOOT_RET:
- return initcall_ret_print_line(iter);
- default:
- return TRACE_TYPE_UNHANDLED;
- }
-}
-
-struct tracer boot_tracer __read_mostly =
-{
- .name = "initcall",
- .init = boot_trace_init,
- .reset = tracing_reset_online_cpus,
- .print_line = initcall_print_line,
-};
-
-void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
-{
- struct ftrace_event_call *call = &event_boot_call;
- struct ring_buffer_event *event;
- struct ring_buffer *buffer;
- struct trace_boot_call *entry;
- struct trace_array *tr = boot_trace;
-
- if (!tr || !pre_initcalls_finished)
- return;
-
- /* Get its name now since this function could
- * disappear because it is in the .init section.
- */
- sprint_symbol(bt->func, (unsigned long)fn);
- preempt_disable();
-
- buffer = tr->buffer;
- event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_CALL,
- sizeof(*entry), 0, 0);
- if (!event)
- goto out;
- entry = ring_buffer_event_data(event);
- entry->boot_call = *bt;
- if (!filter_check_discard(call, entry, buffer, event))
- trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
- preempt_enable();
-}
-
-void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
-{
- struct ftrace_event_call *call = &event_boot_ret;
- struct ring_buffer_event *event;
- struct ring_buffer *buffer;
- struct trace_boot_ret *entry;
- struct trace_array *tr = boot_trace;
-
- if (!tr || !pre_initcalls_finished)
- return;
-
- sprint_symbol(bt->func, (unsigned long)fn);
- preempt_disable();
-
- buffer = tr->buffer;
- event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_RET,
- sizeof(*entry), 0, 0);
- if (!event)
- goto out;
- entry = ring_buffer_event_data(event);
- entry->boot_ret = *bt;
- if (!filter_check_discard(call, entry, buffer, event))
- trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
- preempt_enable();
-}
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 9d589d8..52fda6c 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -32,16 +32,15 @@
u64 notrace trace_clock_local(void)
{
u64 clock;
- int resched;
/*
* sched_clock() is an architecture implemented, fast, scalable,
* lockless clock. It is not guaranteed to be coherent across
* CPUs, nor across CPU idle events.
*/
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
clock = sched_clock();
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
return clock;
}
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index dc008c1..e3dfeca 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -151,23 +151,6 @@ FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
);
/*
- * Special (free-form) trace entry:
- */
-FTRACE_ENTRY(special, special_entry,
-
- TRACE_SPECIAL,
-
- F_STRUCT(
- __field( unsigned long, arg1 )
- __field( unsigned long, arg2 )
- __field( unsigned long, arg3 )
- ),
-
- F_printk("(%08lx) (%08lx) (%08lx)",
- __entry->arg1, __entry->arg2, __entry->arg3)
-);
-
-/*
* Stack-trace entry:
*/
@@ -271,33 +254,6 @@ FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
__entry->map_id, __entry->opcode)
);
-FTRACE_ENTRY(boot_call, trace_boot_call,
-
- TRACE_BOOT_CALL,
-
- F_STRUCT(
- __field_struct( struct boot_trace_call, boot_call )
- __field_desc( pid_t, boot_call, caller )
- __array_desc( char, boot_call, func, KSYM_SYMBOL_LEN)
- ),
-
- F_printk("%d %s", __entry->caller, __entry->func)
-);
-
-FTRACE_ENTRY(boot_ret, trace_boot_ret,
-
- TRACE_BOOT_RET,
-
- F_STRUCT(
- __field_struct( struct boot_trace_ret, boot_ret )
- __array_desc( char, boot_ret, func, KSYM_SYMBOL_LEN)
- __field_desc( int, boot_ret, result )
- __field_desc( unsigned long, boot_ret, duration )
- ),
-
- F_printk("%s %d %lx",
- __entry->func, __entry->result, __entry->duration)
-);
#define TRACE_FUNC_SIZE 30
#define TRACE_FILE_SIZE 20
@@ -318,53 +274,3 @@ FTRACE_ENTRY(branch, trace_branch,
__entry->func, __entry->file, __entry->correct)
);
-FTRACE_ENTRY(kmem_alloc, kmemtrace_alloc_entry,
-
- TRACE_KMEM_ALLOC,
-
- F_STRUCT(
- __field( enum kmemtrace_type_id, type_id )
- __field( unsigned long, call_site )
- __field( const void *, ptr )
- __field( size_t, bytes_req )
- __field( size_t, bytes_alloc )
- __field( gfp_t, gfp_flags )
- __field( int, node )
- ),
-
- F_printk("type:%u call_site:%lx ptr:%p req:%zi alloc:%zi"
- " flags:%x node:%d",
- __entry->type_id, __entry->call_site, __entry->ptr,
- __entry->bytes_req, __entry->bytes_alloc,
- __entry->gfp_flags, __entry->node)
-);
-
-FTRACE_ENTRY(kmem_free, kmemtrace_free_entry,
-
- TRACE_KMEM_FREE,
-
- F_STRUCT(
- __field( enum kmemtrace_type_id, type_id )
- __field( unsigned long, call_site )
- __field( const void *, ptr )
- ),
-
- F_printk("type:%u call_site:%lx ptr:%p",
- __entry->type_id, __entry->call_site, __entry->ptr)
-);
-
-FTRACE_ENTRY(ksym_trace, ksym_trace_entry,
-
- TRACE_KSYM,
-
- F_STRUCT(
- __field( unsigned long, ip )
- __field( unsigned char, type )
- __array( char , cmd, TASK_COMM_LEN )
- __field( unsigned long, addr )
- ),
-
- F_printk("ip: %pF type: %d ksym_name: %pS cmd: %s",
- (void *)__entry->ip, (unsigned int)__entry->type,
- (void *)__entry->addr, __entry->cmd)
-);
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 8a2b73f..000e6e8 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -9,8 +9,6 @@
#include <linux/kprobes.h>
#include "trace.h"
-EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
-
static char *perf_trace_buf[4];
/*
@@ -56,13 +54,7 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
}
}
- if (tp_event->class->reg)
- ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
- else
- ret = tracepoint_probe_register(tp_event->name,
- tp_event->class->perf_probe,
- tp_event);
-
+ ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
if (ret)
goto fail;
@@ -96,9 +88,7 @@ int perf_trace_init(struct perf_event *p_event)
mutex_lock(&event_mutex);
list_for_each_entry(tp_event, &ftrace_events, list) {
if (tp_event->event.type == event_id &&
- tp_event->class &&
- (tp_event->class->perf_probe ||
- tp_event->class->reg) &&
+ tp_event->class && tp_event->class->reg &&
try_module_get(tp_event->mod)) {
ret = perf_trace_event_init(tp_event, p_event);
break;
@@ -138,18 +128,13 @@ void perf_trace_destroy(struct perf_event *p_event)
if (--tp_event->perf_refcount > 0)
goto out;
- if (tp_event->class->reg)
- tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
- else
- tracepoint_probe_unregister(tp_event->name,
- tp_event->class->perf_probe,
- tp_event);
+ tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
/*
- * Ensure our callback won't be called anymore. See
- * tracepoint_probe_unregister() and __DO_TRACE().
+ * Ensure our callback won't be called anymore. The buffers
+ * will be freed after that.
*/
- synchronize_sched();
+ tracepoint_synchronize_unregister();
free_percpu(tp_event->perf_events);
tp_event->perf_events = NULL;
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 53cffc0..09b4fa6 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -28,6 +28,7 @@
DEFINE_MUTEX(event_mutex);
LIST_HEAD(ftrace_events);
+LIST_HEAD(ftrace_common_fields);
struct list_head *
trace_get_fields(struct ftrace_event_call *event_call)
@@ -37,15 +38,11 @@ trace_get_fields(struct ftrace_event_call *event_call)
return event_call->class->get_fields(event_call);
}
-int trace_define_field(struct ftrace_event_call *call, const char *type,
- const char *name, int offset, int size, int is_signed,
- int filter_type)
+static int __trace_define_field(struct list_head *head, const char *type,
+ const char *name, int offset, int size,
+ int is_signed, int filter_type)
{
struct ftrace_event_field *field;
- struct list_head *head;
-
- if (WARN_ON(!call->class))
- return 0;
field = kzalloc(sizeof(*field), GFP_KERNEL);
if (!field)
@@ -68,7 +65,6 @@ int trace_define_field(struct ftrace_event_call *call, const char *type,
field->size = size;
field->is_signed = is_signed;
- head = trace_get_fields(call);
list_add(&field->link, head);
return 0;
@@ -80,17 +76,32 @@ err:
return -ENOMEM;
}
+
+int trace_define_field(struct ftrace_event_call *call, const char *type,
+ const char *name, int offset, int size, int is_signed,
+ int filter_type)
+{
+ struct list_head *head;
+
+ if (WARN_ON(!call->class))
+ return 0;
+
+ head = trace_get_fields(call);
+ return __trace_define_field(head, type, name, offset, size,
+ is_signed, filter_type);
+}
EXPORT_SYMBOL_GPL(trace_define_field);
#define __common_field(type, item) \
- ret = trace_define_field(call, #type, "common_" #item, \
- offsetof(typeof(ent), item), \
- sizeof(ent.item), \
- is_signed_type(type), FILTER_OTHER); \
+ ret = __trace_define_field(&ftrace_common_fields, #type, \
+ "common_" #item, \
+ offsetof(typeof(ent), item), \
+ sizeof(ent.item), \
+ is_signed_type(type), FILTER_OTHER); \
if (ret) \
return ret;
-static int trace_define_common_fields(struct ftrace_event_call *call)
+static int trace_define_common_fields(void)
{
int ret;
struct trace_entry ent;
@@ -130,6 +141,55 @@ int trace_event_raw_init(struct ftrace_event_call *call)
}
EXPORT_SYMBOL_GPL(trace_event_raw_init);
+int ftrace_event_reg(struct ftrace_event_call *call, enum trace_reg type)
+{
+ switch (type) {
+ case TRACE_REG_REGISTER:
+ return tracepoint_probe_register(call->name,
+ call->class->probe,
+ call);
+ case TRACE_REG_UNREGISTER:
+ tracepoint_probe_unregister(call->name,
+ call->class->probe,
+ call);
+ return 0;
+
+#ifdef CONFIG_PERF_EVENTS
+ case TRACE_REG_PERF_REGISTER:
+ return tracepoint_probe_register(call->name,
+ call->class->perf_probe,
+ call);
+ case TRACE_REG_PERF_UNREGISTER:
+ tracepoint_probe_unregister(call->name,
+ call->class->perf_probe,
+ call);
+ return 0;
+#endif
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ftrace_event_reg);
+
+void trace_event_enable_cmd_record(bool enable)
+{
+ struct ftrace_event_call *call;
+
+ mutex_lock(&event_mutex);
+ list_for_each_entry(call, &ftrace_events, list) {
+ if (!(call->flags & TRACE_EVENT_FL_ENABLED))
+ continue;
+
+ if (enable) {
+ tracing_start_cmdline_record();
+ call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+ } else {
+ tracing_stop_cmdline_record();
+ call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+ }
+ }
+ mutex_unlock(&event_mutex);
+}
+
static int ftrace_event_enable_disable(struct ftrace_event_call *call,
int enable)
{
@@ -139,24 +199,20 @@ static int ftrace_event_enable_disable(struct ftrace_event_call *call,
case 0:
if (call->flags & TRACE_EVENT_FL_ENABLED) {
call->flags &= ~TRACE_EVENT_FL_ENABLED;
- tracing_stop_cmdline_record();
- if (call->class->reg)
- call->class->reg(call, TRACE_REG_UNREGISTER);
- else
- tracepoint_probe_unregister(call->name,
- call->class->probe,
- call);
+ if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) {
+ tracing_stop_cmdline_record();
+ call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+ }
+ call->class->reg(call, TRACE_REG_UNREGISTER);
}
break;
case 1:
if (!(call->flags & TRACE_EVENT_FL_ENABLED)) {
- tracing_start_cmdline_record();
- if (call->class->reg)
- ret = call->class->reg(call, TRACE_REG_REGISTER);
- else
- ret = tracepoint_probe_register(call->name,
- call->class->probe,
- call);
+ if (trace_flags & TRACE_ITER_RECORD_CMD) {
+ tracing_start_cmdline_record();
+ call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+ }
+ ret = call->class->reg(call, TRACE_REG_REGISTER);
if (ret) {
tracing_stop_cmdline_record();
pr_info("event trace: Could not enable event "
@@ -194,8 +250,7 @@ static int __ftrace_set_clr_event(const char *match, const char *sub,
mutex_lock(&event_mutex);
list_for_each_entry(call, &ftrace_events, list) {
- if (!call->name || !call->class ||
- (!call->class->probe && !call->class->reg))
+ if (!call->name || !call->class || !call->class->reg)
continue;
if (match &&
@@ -321,7 +376,7 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
* The ftrace subsystem is for showing formats only.
* They can not be enabled or disabled via the event files.
*/
- if (call->class && (call->class->probe || call->class->reg))
+ if (call->class && call->class->reg)
return call;
}
@@ -474,8 +529,7 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
mutex_lock(&event_mutex);
list_for_each_entry(call, &ftrace_events, list) {
- if (!call->name || !call->class ||
- (!call->class->probe && !call->class->reg))
+ if (!call->name || !call->class || !call->class->reg)
continue;
if (system && strcmp(call->class->system, system) != 0)
@@ -544,32 +598,10 @@ out:
return ret;
}
-static ssize_t
-event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
- loff_t *ppos)
+static void print_event_fields(struct trace_seq *s, struct list_head *head)
{
- struct ftrace_event_call *call = filp->private_data;
struct ftrace_event_field *field;
- struct list_head *head;
- struct trace_seq *s;
- int common_field_count = 5;
- char *buf;
- int r = 0;
-
- if (*ppos)
- return 0;
-
- s = kmalloc(sizeof(*s), GFP_KERNEL);
- if (!s)
- return -ENOMEM;
-
- trace_seq_init(s);
-
- trace_seq_printf(s, "name: %s\n", call->name);
- trace_seq_printf(s, "ID: %d\n", call->event.type);
- trace_seq_printf(s, "format:\n");
- head = trace_get_fields(call);
list_for_each_entry_reverse(field, head, link) {
/*
* Smartly shows the array type(except dynamic array).
@@ -584,29 +616,54 @@ event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
array_descriptor = NULL;
if (!array_descriptor) {
- r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
+ trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
"\tsize:%u;\tsigned:%d;\n",
field->type, field->name, field->offset,
field->size, !!field->is_signed);
} else {
- r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
+ trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
"\tsize:%u;\tsigned:%d;\n",
(int)(array_descriptor - field->type),
field->type, field->name,
array_descriptor, field->offset,
field->size, !!field->is_signed);
}
+ }
+}
- if (--common_field_count == 0)
- r = trace_seq_printf(s, "\n");
+static ssize_t
+event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ struct ftrace_event_call *call = filp->private_data;
+ struct list_head *head;
+ struct trace_seq *s;
+ char *buf;
+ int r;
- if (!r)
- break;
- }
+ if (*ppos)
+ return 0;
+
+ s = kmalloc(sizeof(*s), GFP_KERNEL);
+ if (!s)
+ return -ENOMEM;
+
+ trace_seq_init(s);
+
+ trace_seq_printf(s, "name: %s\n", call->name);
+ trace_seq_printf(s, "ID: %d\n", call->event.type);
+ trace_seq_printf(s, "format:\n");
+
+ /* print common fields */
+ print_event_fields(s, &ftrace_common_fields);
- if (r)
- r = trace_seq_printf(s, "\nprint fmt: %s\n",
- call->print_fmt);
+ trace_seq_putc(s, '\n');
+
+ /* print event specific fields */
+ head = trace_get_fields(call);
+ print_event_fields(s, head);
+
+ r = trace_seq_printf(s, "\nprint fmt: %s\n", call->print_fmt);
if (!r) {
/*
@@ -963,35 +1020,31 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
return -1;
}
- if (call->class->probe || call->class->reg)
+ if (call->class->reg)
trace_create_file("enable", 0644, call->dir, call,
enable);
#ifdef CONFIG_PERF_EVENTS
- if (call->event.type && (call->class->perf_probe || call->class->reg))
+ if (call->event.type && call->class->reg)
trace_create_file("id", 0444, call->dir, call,
id);
#endif
- if (call->class->define_fields) {
- /*
- * Other events may have the same class. Only update
- * the fields if they are not already defined.
- */
- head = trace_get_fields(call);
- if (list_empty(head)) {
- ret = trace_define_common_fields(call);
- if (!ret)
- ret = call->class->define_fields(call);
- if (ret < 0) {
- pr_warning("Could not initialize trace point"
- " events/%s\n", call->name);
- return ret;
- }
+ /*
+ * Other events may have the same class. Only update
+ * the fields if they are not already defined.
+ */
+ head = trace_get_fields(call);
+ if (list_empty(head)) {
+ ret = call->class->define_fields(call);
+ if (ret < 0) {
+ pr_warning("Could not initialize trace point"
+ " events/%s\n", call->name);
+ return ret;
}
- trace_create_file("filter", 0644, call->dir, call,
- filter);
}
+ trace_create_file("filter", 0644, call->dir, call,
+ filter);
trace_create_file("format", 0444, call->dir, call,
format);
@@ -999,11 +1052,17 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
return 0;
}
-static int __trace_add_event_call(struct ftrace_event_call *call)
+static int
+__trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
+ const struct file_operations *id,
+ const struct file_operations *enable,
+ const struct file_operations *filter,
+ const struct file_operations *format)
{
struct dentry *d_events;
int ret;
+ /* The linker may leave blanks */
if (!call->name)
return -EINVAL;
@@ -1011,8 +1070,8 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
ret = call->class->raw_init(call);
if (ret < 0) {
if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "events/%s\n", call->name);
+ pr_warning("Could not initialize trace events/%s\n",
+ call->name);
return ret;
}
}
@@ -1021,11 +1080,10 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
if (!d_events)
return -ENOENT;
- ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
- &ftrace_enable_fops, &ftrace_event_filter_fops,
- &ftrace_event_format_fops);
+ ret = event_create_dir(call, d_events, id, enable, filter, format);
if (!ret)
list_add(&call->list, &ftrace_events);
+ call->mod = mod;
return ret;
}
@@ -1035,7 +1093,10 @@ int trace_add_event_call(struct ftrace_event_call *call)
{
int ret;
mutex_lock(&event_mutex);
- ret = __trace_add_event_call(call);
+ ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
+ &ftrace_enable_fops,
+ &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
mutex_unlock(&event_mutex);
return ret;
}
@@ -1152,8 +1213,6 @@ static void trace_module_add_events(struct module *mod)
{
struct ftrace_module_file_ops *file_ops = NULL;
struct ftrace_event_call *call, *start, *end;
- struct dentry *d_events;
- int ret;
start = mod->trace_events;
end = mod->trace_events + mod->num_trace_events;
@@ -1161,38 +1220,14 @@ static void trace_module_add_events(struct module *mod)
if (start == end)
return;
- d_events = event_trace_events_dir();
- if (!d_events)
+ file_ops = trace_create_file_ops(mod);
+ if (!file_ops)
return;
for_each_event(call, start, end) {
- /* The linker may leave blanks */
- if (!call->name)
- continue;
- if (call->class->raw_init) {
- ret = call->class->raw_init(call);
- if (ret < 0) {
- if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "point events/%s\n", call->name);
- continue;
- }
- }
- /*
- * This module has events, create file ops for this module
- * if not already done.
- */
- if (!file_ops) {
- file_ops = trace_create_file_ops(mod);
- if (!file_ops)
- return;
- }
- call->mod = mod;
- ret = event_create_dir(call, d_events,
+ __trace_add_event_call(call, mod,
&file_ops->id, &file_ops->enable,
&file_ops->filter, &file_ops->format);
- if (!ret)
- list_add(&call->list, &ftrace_events);
}
}
@@ -1319,25 +1354,14 @@ static __init int event_trace_init(void)
trace_create_file("enable", 0644, d_events,
NULL, &ftrace_system_enable_fops);
+ if (trace_define_common_fields())
+ pr_warning("tracing: Failed to allocate common fields");
+
for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
- /* The linker may leave blanks */
- if (!call->name)
- continue;
- if (call->class->raw_init) {
- ret = call->class->raw_init(call);
- if (ret < 0) {
- if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "point events/%s\n", call->name);
- continue;
- }
- }
- ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
+ __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
&ftrace_enable_fops,
&ftrace_event_filter_fops,
&ftrace_event_format_fops);
- if (!ret)
- list_add(&call->list, &ftrace_events);
}
while (true) {
@@ -1524,12 +1548,11 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip)
struct ftrace_entry *entry;
unsigned long flags;
long disabled;
- int resched;
int cpu;
int pc;
pc = preempt_count();
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
cpu = raw_smp_processor_id();
disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
@@ -1551,7 +1574,7 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip)
out:
atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
}
static struct ftrace_ops trace_ops __initdata =
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 57bb1bb..36d4010 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -497,12 +497,10 @@ void print_subsystem_event_filter(struct event_subsystem *system,
}
static struct ftrace_event_field *
-find_event_field(struct ftrace_event_call *call, char *name)
+__find_event_field(struct list_head *head, char *name)
{
struct ftrace_event_field *field;
- struct list_head *head;
- head = trace_get_fields(call);
list_for_each_entry(field, head, link) {
if (!strcmp(field->name, name))
return field;
@@ -511,6 +509,20 @@ find_event_field(struct ftrace_event_call *call, char *name)
return NULL;
}
+static struct ftrace_event_field *
+find_event_field(struct ftrace_event_call *call, char *name)
+{
+ struct ftrace_event_field *field;
+ struct list_head *head;
+
+ field = __find_event_field(&ftrace_common_fields, name);
+ if (field)
+ return field;
+
+ head = trace_get_fields(call);
+ return __find_event_field(head, name);
+}
+
static void filter_free_pred(struct filter_pred *pred)
{
if (!pred)
@@ -627,9 +639,6 @@ static int init_subsystem_preds(struct event_subsystem *system)
int err;
list_for_each_entry(call, &ftrace_events, list) {
- if (!call->class || !call->class->define_fields)
- continue;
-
if (strcmp(call->class->system, system->name) != 0)
continue;
@@ -646,9 +655,6 @@ static void filter_free_subsystem_preds(struct event_subsystem *system)
struct ftrace_event_call *call;
list_for_each_entry(call, &ftrace_events, list) {
- if (!call->class || !call->class->define_fields)
- continue;
-
if (strcmp(call->class->system, system->name) != 0)
continue;
@@ -1251,9 +1257,6 @@ static int replace_system_preds(struct event_subsystem *system,
list_for_each_entry(call, &ftrace_events, list) {
struct event_filter *filter = call->filter;
- if (!call->class || !call->class->define_fields)
- continue;
-
if (strcmp(call->class->system, system->name) != 0)
continue;
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 8536e2a..4ba44de 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -125,12 +125,6 @@ ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
#include "trace_entries.h"
-static int ftrace_raw_init_event(struct ftrace_event_call *call)
-{
- INIT_LIST_HEAD(&call->class->fields);
- return 0;
-}
-
#undef __entry
#define __entry REC
@@ -158,7 +152,7 @@ static int ftrace_raw_init_event(struct ftrace_event_call *call)
struct ftrace_event_class event_class_ftrace_##call = { \
.system = __stringify(TRACE_SYSTEM), \
.define_fields = ftrace_define_fields_##call, \
- .raw_init = ftrace_raw_init_event, \
+ .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
}; \
\
struct ftrace_event_call __used \
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index b3f3776..16aee4d 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -54,14 +54,14 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
- int cpu, resched;
+ int cpu;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
pc = preempt_count();
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
local_save_flags(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
@@ -71,7 +71,7 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
trace_function(tr, ip, parent_ip, flags, pc);
atomic_dec(&data->disabled);
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
}
static void
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 79f4bac..6bff236 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -641,7 +641,8 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
/* Print nsecs (we don't want to exceed 7 numbers) */
if (len < 7) {
- snprintf(nsecs_str, 8 - len, "%03lu", nsecs_rem);
+ snprintf(nsecs_str, min(sizeof(nsecs_str), 8UL - len), "%03lu",
+ nsecs_rem);
ret = trace_seq_printf(s, ".%s", nsecs_str);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 6fd486e..73a6b06 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -649,6 +649,7 @@ static struct tracer irqsoff_tracer __read_mostly =
#endif
.open = irqsoff_trace_open,
.close = irqsoff_trace_close,
+ .use_max_tr = 1,
};
# define register_irqsoff(trace) register_tracer(&trace)
#else
@@ -681,6 +682,7 @@ static struct tracer preemptoff_tracer __read_mostly =
#endif
.open = irqsoff_trace_open,
.close = irqsoff_trace_close,
+ .use_max_tr = 1,
};
# define register_preemptoff(trace) register_tracer(&trace)
#else
@@ -715,6 +717,7 @@ static struct tracer preemptirqsoff_tracer __read_mostly =
#endif
.open = irqsoff_trace_open,
.close = irqsoff_trace_close,
+ .use_max_tr = 1,
};
# define register_preemptirqsoff(trace) register_tracer(&trace)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index f52b5f5..8b27c98 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -30,6 +30,8 @@
#include <linux/ptrace.h>
#include <linux/perf_event.h>
#include <linux/stringify.h>
+#include <linux/limits.h>
+#include <linux/uaccess.h>
#include <asm/bitsperlong.h>
#include "trace.h"
@@ -38,6 +40,7 @@
#define MAX_TRACE_ARGS 128
#define MAX_ARGSTR_LEN 63
#define MAX_EVENT_NAME_LEN 64
+#define MAX_STRING_SIZE PATH_MAX
#define KPROBE_EVENT_SYSTEM "kprobes"
/* Reserved field names */
@@ -58,14 +61,16 @@ const char *reserved_field_names[] = {
};
/* Printing function type */
-typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *);
+typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *,
+ void *);
#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
/* Printing in basic type function template */
#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast) \
static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \
- const char *name, void *data)\
+ const char *name, \
+ void *data, void *ent)\
{ \
return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\
} \
@@ -80,6 +85,49 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int)
DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long)
DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long)
+/* data_rloc: data relative location, compatible with u32 */
+#define make_data_rloc(len, roffs) \
+ (((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
+#define get_rloc_len(dl) ((u32)(dl) >> 16)
+#define get_rloc_offs(dl) ((u32)(dl) & 0xffff)
+
+static inline void *get_rloc_data(u32 *dl)
+{
+ return (u8 *)dl + get_rloc_offs(*dl);
+}
+
+/* For data_loc conversion */
+static inline void *get_loc_data(u32 *dl, void *ent)
+{
+ return (u8 *)ent + get_rloc_offs(*dl);
+}
+
+/*
+ * Convert data_rloc to data_loc:
+ * data_rloc stores the offset from data_rloc itself, but data_loc
+ * stores the offset from event entry.
+ */
+#define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs))
+
+/* For defining macros, define string/string_size types */
+typedef u32 string;
+typedef u32 string_size;
+
+/* Print type function for string type */
+static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
+ const char *name,
+ void *data, void *ent)
+{
+ int len = *(u32 *)data >> 16;
+
+ if (!len)
+ return trace_seq_printf(s, " %s=(fault)", name);
+ else
+ return trace_seq_printf(s, " %s=\"%s\"", name,
+ (const char *)get_loc_data(data, ent));
+}
+static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
+
/* Data fetch function type */
typedef void (*fetch_func_t)(struct pt_regs *, void *, void *);
@@ -94,32 +142,38 @@ static __kprobes void call_fetch(struct fetch_param *fprm,
return fprm->fn(regs, fprm->data, dest);
}
-#define FETCH_FUNC_NAME(kind, type) fetch_##kind##_##type
+#define FETCH_FUNC_NAME(method, type) fetch_##method##_##type
/*
* Define macro for basic types - we don't need to define s* types, because
* we have to care only about bitwidth at recording time.
*/
-#define DEFINE_BASIC_FETCH_FUNCS(kind) \
-DEFINE_FETCH_##kind(u8) \
-DEFINE_FETCH_##kind(u16) \
-DEFINE_FETCH_##kind(u32) \
-DEFINE_FETCH_##kind(u64)
-
-#define CHECK_BASIC_FETCH_FUNCS(kind, fn) \
- ((FETCH_FUNC_NAME(kind, u8) == fn) || \
- (FETCH_FUNC_NAME(kind, u16) == fn) || \
- (FETCH_FUNC_NAME(kind, u32) == fn) || \
- (FETCH_FUNC_NAME(kind, u64) == fn))
+#define DEFINE_BASIC_FETCH_FUNCS(method) \
+DEFINE_FETCH_##method(u8) \
+DEFINE_FETCH_##method(u16) \
+DEFINE_FETCH_##method(u32) \
+DEFINE_FETCH_##method(u64)
+
+#define CHECK_FETCH_FUNCS(method, fn) \
+ (((FETCH_FUNC_NAME(method, u8) == fn) || \
+ (FETCH_FUNC_NAME(method, u16) == fn) || \
+ (FETCH_FUNC_NAME(method, u32) == fn) || \
+ (FETCH_FUNC_NAME(method, u64) == fn) || \
+ (FETCH_FUNC_NAME(method, string) == fn) || \
+ (FETCH_FUNC_NAME(method, string_size) == fn)) \
+ && (fn != NULL))
/* Data fetch function templates */
#define DEFINE_FETCH_reg(type) \
static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, \
- void *offset, void *dest) \
+ void *offset, void *dest) \
{ \
*(type *)dest = (type)regs_get_register(regs, \
(unsigned int)((unsigned long)offset)); \
}
DEFINE_BASIC_FETCH_FUNCS(reg)
+/* No string on the register */
+#define fetch_reg_string NULL
+#define fetch_reg_string_size NULL
#define DEFINE_FETCH_stack(type) \
static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
@@ -129,6 +183,9 @@ static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
(unsigned int)((unsigned long)offset)); \
}
DEFINE_BASIC_FETCH_FUNCS(stack)
+/* No string on the stack entry */
+#define fetch_stack_string NULL
+#define fetch_stack_string_size NULL
#define DEFINE_FETCH_retval(type) \
static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
@@ -137,6 +194,9 @@ static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
*(type *)dest = (type)regs_return_value(regs); \
}
DEFINE_BASIC_FETCH_FUNCS(retval)
+/* No string on the retval */
+#define fetch_retval_string NULL
+#define fetch_retval_string_size NULL
#define DEFINE_FETCH_memory(type) \
static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
@@ -149,6 +209,62 @@ static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
*(type *)dest = retval; \
}
DEFINE_BASIC_FETCH_FUNCS(memory)
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+ void *addr, void *dest)
+{
+ long ret;
+ int maxlen = get_rloc_len(*(u32 *)dest);
+ u8 *dst = get_rloc_data(dest);
+ u8 *src = addr;
+ mm_segment_t old_fs = get_fs();
+ if (!maxlen)
+ return;
+ /*
+ * Try to get string again, since the string can be changed while
+ * probing.
+ */
+ set_fs(KERNEL_DS);
+ pagefault_disable();
+ do
+ ret = __copy_from_user_inatomic(dst++, src++, 1);
+ while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
+ dst[-1] = '\0';
+ pagefault_enable();
+ set_fs(old_fs);
+
+ if (ret < 0) { /* Failed to fetch string */
+ ((u8 *)get_rloc_data(dest))[0] = '\0';
+ *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
+ } else
+ *(u32 *)dest = make_data_rloc(src - (u8 *)addr,
+ get_rloc_offs(*(u32 *)dest));
+}
+/* Return the length of string -- including null terminal byte */
+static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+ void *addr, void *dest)
+{
+ int ret, len = 0;
+ u8 c;
+ mm_segment_t old_fs = get_fs();
+
+ set_fs(KERNEL_DS);
+ pagefault_disable();
+ do {
+ ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
+ len++;
+ } while (c && ret == 0 && len < MAX_STRING_SIZE);
+ pagefault_enable();
+ set_fs(old_fs);
+
+ if (ret < 0) /* Failed to check the length */
+ *(u32 *)dest = 0;
+ else
+ *(u32 *)dest = len;
+}
/* Memory fetching by symbol */
struct symbol_cache {
@@ -203,6 +319,8 @@ static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\
*(type *)dest = 0; \
}
DEFINE_BASIC_FETCH_FUNCS(symbol)
+DEFINE_FETCH_symbol(string)
+DEFINE_FETCH_symbol(string_size)
/* Dereference memory access function */
struct deref_fetch_param {
@@ -224,12 +342,14 @@ static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\
*(type *)dest = 0; \
}
DEFINE_BASIC_FETCH_FUNCS(deref)
+DEFINE_FETCH_deref(string)
+DEFINE_FETCH_deref(string_size)
static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
{
- if (CHECK_BASIC_FETCH_FUNCS(deref, data->orig.fn))
+ if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
free_deref_fetch_param(data->orig.data);
- else if (CHECK_BASIC_FETCH_FUNCS(symbol, data->orig.fn))
+ else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
free_symbol_cache(data->orig.data);
kfree(data);
}
@@ -240,23 +360,43 @@ static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
-#define ASSIGN_FETCH_FUNC(kind, type) \
- .kind = FETCH_FUNC_NAME(kind, type)
-
-#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
- {.name = #ptype, \
- .size = sizeof(ftype), \
- .is_signed = sign, \
- .print = PRINT_TYPE_FUNC_NAME(ptype), \
- .fmt = PRINT_TYPE_FMT_NAME(ptype), \
-ASSIGN_FETCH_FUNC(reg, ftype), \
-ASSIGN_FETCH_FUNC(stack, ftype), \
-ASSIGN_FETCH_FUNC(retval, ftype), \
-ASSIGN_FETCH_FUNC(memory, ftype), \
-ASSIGN_FETCH_FUNC(symbol, ftype), \
-ASSIGN_FETCH_FUNC(deref, ftype), \
+/* Fetch types */
+enum {
+ FETCH_MTD_reg = 0,
+ FETCH_MTD_stack,
+ FETCH_MTD_retval,
+ FETCH_MTD_memory,
+ FETCH_MTD_symbol,
+ FETCH_MTD_deref,
+ FETCH_MTD_END,
+};
+
+#define ASSIGN_FETCH_FUNC(method, type) \
+ [FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
+
+#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
+ {.name = _name, \
+ .size = _size, \
+ .is_signed = sign, \
+ .print = PRINT_TYPE_FUNC_NAME(ptype), \
+ .fmt = PRINT_TYPE_FMT_NAME(ptype), \
+ .fmttype = _fmttype, \
+ .fetch = { \
+ASSIGN_FETCH_FUNC(reg, ftype), \
+ASSIGN_FETCH_FUNC(stack, ftype), \
+ASSIGN_FETCH_FUNC(retval, ftype), \
+ASSIGN_FETCH_FUNC(memory, ftype), \
+ASSIGN_FETCH_FUNC(symbol, ftype), \
+ASSIGN_FETCH_FUNC(deref, ftype), \
+ } \
}
+#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
+ __ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
+
+#define FETCH_TYPE_STRING 0
+#define FETCH_TYPE_STRSIZE 1
+
/* Fetch type information table */
static const struct fetch_type {
const char *name; /* Name of type */
@@ -264,14 +404,16 @@ static const struct fetch_type {
int is_signed; /* Signed flag */
print_type_func_t print; /* Print functions */
const char *fmt; /* Fromat string */
+ const char *fmttype; /* Name in format file */
/* Fetch functions */
- fetch_func_t reg;
- fetch_func_t stack;
- fetch_func_t retval;
- fetch_func_t memory;
- fetch_func_t symbol;
- fetch_func_t deref;
+ fetch_func_t fetch[FETCH_MTD_END];
} fetch_type_table[] = {
+ /* Special types */
+ [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
+ sizeof(u32), 1, "__data_loc char[]"),
+ [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
+ string_size, sizeof(u32), 0, "u32"),
+ /* Basic types */
ASSIGN_FETCH_TYPE(u8, u8, 0),
ASSIGN_FETCH_TYPE(u16, u16, 0),
ASSIGN_FETCH_TYPE(u32, u32, 0),
@@ -302,12 +444,28 @@ static __kprobes void fetch_stack_address(struct pt_regs *regs,
*(unsigned long *)dest = kernel_stack_pointer(regs);
}
+static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
+ fetch_func_t orig_fn)
+{
+ int i;
+
+ if (type != &fetch_type_table[FETCH_TYPE_STRING])
+ return NULL; /* Only string type needs size function */
+ for (i = 0; i < FETCH_MTD_END; i++)
+ if (type->fetch[i] == orig_fn)
+ return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
+
+ WARN_ON(1); /* This should not happen */
+ return NULL;
+}
+
/**
* Kprobe event core functions
*/
struct probe_arg {
struct fetch_param fetch;
+ struct fetch_param fetch_size;
unsigned int offset; /* Offset from argument entry */
const char *name; /* Name of this argument */
const char *comm; /* Command of this argument */
@@ -429,9 +587,9 @@ error:
static void free_probe_arg(struct probe_arg *arg)
{
- if (CHECK_BASIC_FETCH_FUNCS(deref, arg->fetch.fn))
+ if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
free_deref_fetch_param(arg->fetch.data);
- else if (CHECK_BASIC_FETCH_FUNCS(symbol, arg->fetch.fn))
+ else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
free_symbol_cache(arg->fetch.data);
kfree(arg->name);
kfree(arg->comm);
@@ -548,7 +706,7 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
if (strcmp(arg, "retval") == 0) {
if (is_return)
- f->fn = t->retval;
+ f->fn = t->fetch[FETCH_MTD_retval];
else
ret = -EINVAL;
} else if (strncmp(arg, "stack", 5) == 0) {
@@ -562,7 +720,7 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
if (ret || param > PARAM_MAX_STACK)
ret = -EINVAL;
else {
- f->fn = t->stack;
+ f->fn = t->fetch[FETCH_MTD_stack];
f->data = (void *)param;
}
} else
@@ -588,7 +746,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
case '%': /* named register */
ret = regs_query_register_offset(arg + 1);
if (ret >= 0) {
- f->fn = t->reg;
+ f->fn = t->fetch[FETCH_MTD_reg];
f->data = (void *)(unsigned long)ret;
ret = 0;
}
@@ -598,7 +756,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
ret = strict_strtoul(arg + 1, 0, &param);
if (ret)
break;
- f->fn = t->memory;
+ f->fn = t->fetch[FETCH_MTD_memory];
f->data = (void *)param;
} else {
ret = split_symbol_offset(arg + 1, &offset);
@@ -606,7 +764,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
break;
f->data = alloc_symbol_cache(arg + 1, offset);
if (f->data)
- f->fn = t->symbol;
+ f->fn = t->fetch[FETCH_MTD_symbol];
}
break;
case '+': /* deref memory */
@@ -636,14 +794,17 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
if (ret)
kfree(dprm);
else {
- f->fn = t->deref;
+ f->fn = t->fetch[FETCH_MTD_deref];
f->data = (void *)dprm;
}
}
break;
}
- if (!ret && !f->fn)
+ if (!ret && !f->fn) { /* Parsed, but do not find fetch method */
+ pr_info("%s type has no corresponding fetch method.\n",
+ t->name);
ret = -EINVAL;
+ }
return ret;
}
@@ -652,6 +813,7 @@ static int parse_probe_arg(char *arg, struct trace_probe *tp,
struct probe_arg *parg, int is_return)
{
const char *t;
+ int ret;
if (strlen(arg) > MAX_ARGSTR_LEN) {
pr_info("Argument is too long.: %s\n", arg);
@@ -674,7 +836,13 @@ static int parse_probe_arg(char *arg, struct trace_probe *tp,
}
parg->offset = tp->size;
tp->size += parg->type->size;
- return __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
+ ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
+ if (ret >= 0) {
+ parg->fetch_size.fn = get_fetch_size_function(parg->type,
+ parg->fetch.fn);
+ parg->fetch_size.data = parg->fetch.data;
+ }
+ return ret;
}
/* Return 1 if name is reserved or already used by another argument */
@@ -757,14 +925,17 @@ static int create_trace_probe(int argc, char **argv)
pr_info("Delete command needs an event name.\n");
return -EINVAL;
}
+ mutex_lock(&probe_lock);
tp = find_probe_event(event, group);
if (!tp) {
+ mutex_unlock(&probe_lock);
pr_info("Event %s/%s doesn't exist.\n", group, event);
return -ENOENT;
}
/* delete an event */
unregister_trace_probe(tp);
free_trace_probe(tp);
+ mutex_unlock(&probe_lock);
return 0;
}
@@ -1043,6 +1214,54 @@ static const struct file_operations kprobe_profile_ops = {
.release = seq_release,
};
+/* Sum up total data length for dynamic arraies (strings) */
+static __kprobes int __get_data_size(struct trace_probe *tp,
+ struct pt_regs *regs)
+{
+ int i, ret = 0;
+ u32 len;
+
+ for (i = 0; i < tp->nr_args; i++)
+ if (unlikely(tp->args[i].fetch_size.fn)) {
+ call_fetch(&tp->args[i].fetch_size, regs, &len);
+ ret += len;
+ }
+
+ return ret;
+}
+
+/* Store the value of each argument */
+static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
+ struct pt_regs *regs,
+ u8 *data, int maxlen)
+{
+ int i;
+ u32 end = tp->size;
+ u32 *dl; /* Data (relative) location */
+
+ for (i = 0; i < tp->nr_args; i++) {
+ if (unlikely(tp->args[i].fetch_size.fn)) {
+ /*
+ * First, we set the relative location and
+ * maximum data length to *dl
+ */
+ dl = (u32 *)(data + tp->args[i].offset);
+ *dl = make_data_rloc(maxlen, end - tp->args[i].offset);
+ /* Then try to fetch string or dynamic array data */
+ call_fetch(&tp->args[i].fetch, regs, dl);
+ /* Reduce maximum length */
+ end += get_rloc_len(*dl);
+ maxlen -= get_rloc_len(*dl);
+ /* Trick here, convert data_rloc to data_loc */
+ *dl = convert_rloc_to_loc(*dl,
+ ent_size + tp->args[i].offset);
+ } else
+ /* Just fetching data normally */
+ call_fetch(&tp->args[i].fetch, regs,
+ data + tp->args[i].offset);
+ }
+}
+
/* Kprobe handler */
static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
{
@@ -1050,8 +1269,7 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
struct kprobe_trace_entry_head *entry;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
- u8 *data;
- int size, i, pc;
+ int size, dsize, pc;
unsigned long irq_flags;
struct ftrace_event_call *call = &tp->call;
@@ -1060,7 +1278,8 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
local_save_flags(irq_flags);
pc = preempt_count();
- size = sizeof(*entry) + tp->size;
+ dsize = __get_data_size(tp, regs);
+ size = sizeof(*entry) + tp->size + dsize;
event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
size, irq_flags, pc);
@@ -1069,9 +1288,7 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
entry = ring_buffer_event_data(event);
entry->ip = (unsigned long)kp->addr;
- data = (u8 *)&entry[1];
- for (i = 0; i < tp->nr_args; i++)
- call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+ store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
if (!filter_current_check_discard(buffer, call, entry, event))
trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
@@ -1085,15 +1302,15 @@ static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
struct kretprobe_trace_entry_head *entry;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
- u8 *data;
- int size, i, pc;
+ int size, pc, dsize;
unsigned long irq_flags;
struct ftrace_event_call *call = &tp->call;
local_save_flags(irq_flags);
pc = preempt_count();
- size = sizeof(*entry) + tp->size;
+ dsize = __get_data_size(tp, regs);
+ size = sizeof(*entry) + tp->size + dsize;
event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
size, irq_flags, pc);
@@ -1103,9 +1320,7 @@ static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
entry = ring_buffer_event_data(event);
entry->func = (unsigned long)tp->rp.kp.addr;
entry->ret_ip = (unsigned long)ri->ret_addr;
- data = (u8 *)&entry[1];
- for (i = 0; i < tp->nr_args; i++)
- call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+ store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
if (!filter_current_check_discard(buffer, call, entry, event))
trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
@@ -1137,7 +1352,7 @@ print_kprobe_event(struct trace_iterator *iter, int flags,
data = (u8 *)&field[1];
for (i = 0; i < tp->nr_args; i++)
if (!tp->args[i].type->print(s, tp->args[i].name,
- data + tp->args[i].offset))
+ data + tp->args[i].offset, field))
goto partial;
if (!trace_seq_puts(s, "\n"))
@@ -1179,7 +1394,7 @@ print_kretprobe_event(struct trace_iterator *iter, int flags,
data = (u8 *)&field[1];
for (i = 0; i < tp->nr_args; i++)
if (!tp->args[i].type->print(s, tp->args[i].name,
- data + tp->args[i].offset))
+ data + tp->args[i].offset, field))
goto partial;
if (!trace_seq_puts(s, "\n"))
@@ -1214,11 +1429,6 @@ static void probe_event_disable(struct ftrace_event_call *call)
}
}
-static int probe_event_raw_init(struct ftrace_event_call *event_call)
-{
- return 0;
-}
-
#undef DEFINE_FIELD
#define DEFINE_FIELD(type, item, name, is_signed) \
do { \
@@ -1239,7 +1449,7 @@ static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
/* Set argument names as fields */
for (i = 0; i < tp->nr_args; i++) {
- ret = trace_define_field(event_call, tp->args[i].type->name,
+ ret = trace_define_field(event_call, tp->args[i].type->fmttype,
tp->args[i].name,
sizeof(field) + tp->args[i].offset,
tp->args[i].type->size,
@@ -1261,7 +1471,7 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
/* Set argument names as fields */
for (i = 0; i < tp->nr_args; i++) {
- ret = trace_define_field(event_call, tp->args[i].type->name,
+ ret = trace_define_field(event_call, tp->args[i].type->fmttype,
tp->args[i].name,
sizeof(field) + tp->args[i].offset,
tp->args[i].type->size,
@@ -1301,8 +1511,13 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
for (i = 0; i < tp->nr_args; i++) {
- pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
- tp->args[i].name);
+ if (strcmp(tp->args[i].type->name, "string") == 0)
+ pos += snprintf(buf + pos, LEN_OR_ZERO,
+ ", __get_str(%s)",
+ tp->args[i].name);
+ else
+ pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
+ tp->args[i].name);
}
#undef LEN_OR_ZERO
@@ -1339,11 +1554,11 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
struct ftrace_event_call *call = &tp->call;
struct kprobe_trace_entry_head *entry;
struct hlist_head *head;
- u8 *data;
- int size, __size, i;
+ int size, __size, dsize;
int rctx;
- __size = sizeof(*entry) + tp->size;
+ dsize = __get_data_size(tp, regs);
+ __size = sizeof(*entry) + tp->size + dsize;
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
@@ -1355,9 +1570,8 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
return;
entry->ip = (unsigned long)kp->addr;
- data = (u8 *)&entry[1];
- for (i = 0; i < tp->nr_args; i++)
- call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+ memset(&entry[1], 0, dsize);
+ store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
head = this_cpu_ptr(call->perf_events);
perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head);
@@ -1371,11 +1585,11 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
struct ftrace_event_call *call = &tp->call;
struct kretprobe_trace_entry_head *entry;
struct hlist_head *head;
- u8 *data;
- int size, __size, i;
+ int size, __size, dsize;
int rctx;
- __size = sizeof(*entry) + tp->size;
+ dsize = __get_data_size(tp, regs);
+ __size = sizeof(*entry) + tp->size + dsize;
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
@@ -1388,9 +1602,7 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
entry->func = (unsigned long)tp->rp.kp.addr;
entry->ret_ip = (unsigned long)ri->ret_addr;
- data = (u8 *)&entry[1];
- for (i = 0; i < tp->nr_args; i++)
- call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+ store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
head = this_cpu_ptr(call->perf_events);
perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head);
@@ -1486,15 +1698,12 @@ static int register_probe_event(struct trace_probe *tp)
int ret;
/* Initialize ftrace_event_call */
+ INIT_LIST_HEAD(&call->class->fields);
if (probe_is_return(tp)) {
- INIT_LIST_HEAD(&call->class->fields);
call->event.funcs = &kretprobe_funcs;
- call->class->raw_init = probe_event_raw_init;
call->class->define_fields = kretprobe_event_define_fields;
} else {
- INIT_LIST_HEAD(&call->class->fields);
call->event.funcs = &kprobe_funcs;
- call->class->raw_init = probe_event_raw_init;
call->class->define_fields = kprobe_event_define_fields;
}
if (set_print_fmt(tp) < 0)
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
deleted file mode 100644
index 8eaf007..0000000
--- a/kernel/trace/trace_ksym.c
+++ /dev/null
@@ -1,508 +0,0 @@
-/*
- * trace_ksym.c - Kernel Symbol Tracer
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) IBM Corporation, 2009
- */
-
-#include <linux/kallsyms.h>
-#include <linux/uaccess.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-
-#include "trace_output.h"
-#include "trace.h"
-
-#include <linux/hw_breakpoint.h>
-#include <asm/hw_breakpoint.h>
-
-#include <asm/atomic.h>
-
-#define KSYM_TRACER_OP_LEN 3 /* rw- */
-
-struct trace_ksym {
- struct perf_event **ksym_hbp;
- struct perf_event_attr attr;
-#ifdef CONFIG_PROFILE_KSYM_TRACER
- atomic64_t counter;
-#endif
- struct hlist_node ksym_hlist;
-};
-
-static struct trace_array *ksym_trace_array;
-
-static unsigned int ksym_tracing_enabled;
-
-static HLIST_HEAD(ksym_filter_head);
-
-static DEFINE_MUTEX(ksym_tracer_mutex);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-
-#define MAX_UL_INT 0xffffffff
-
-void ksym_collect_stats(unsigned long hbp_hit_addr)
-{
- struct hlist_node *node;
- struct trace_ksym *entry;
-
- rcu_read_lock();
- hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
- if (entry->attr.bp_addr == hbp_hit_addr) {
- atomic64_inc(&entry->counter);
- break;
- }
- }
- rcu_read_unlock();
-}
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-void ksym_hbp_handler(struct perf_event *hbp, int nmi,
- struct perf_sample_data *data,
- struct pt_regs *regs)
-{
- struct ring_buffer_event *event;
- struct ksym_trace_entry *entry;
- struct ring_buffer *buffer;
- int pc;
-
- if (!ksym_tracing_enabled)
- return;
-
- buffer = ksym_trace_array->buffer;
-
- pc = preempt_count();
-
- event = trace_buffer_lock_reserve(buffer, TRACE_KSYM,
- sizeof(*entry), 0, pc);
- if (!event)
- return;
-
- entry = ring_buffer_event_data(event);
- entry->ip = instruction_pointer(regs);
- entry->type = hw_breakpoint_type(hbp);
- entry->addr = hw_breakpoint_addr(hbp);
- strlcpy(entry->cmd, current->comm, TASK_COMM_LEN);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
- ksym_collect_stats(hw_breakpoint_addr(hbp));
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
- trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-/* Valid access types are represented as
- *
- * rw- : Set Read/Write Access Breakpoint
- * -w- : Set Write Access Breakpoint
- * --- : Clear Breakpoints
- * --x : Set Execution Break points (Not available yet)
- *
- */
-static int ksym_trace_get_access_type(char *str)
-{
- int access = 0;
-
- if (str[0] == 'r')
- access |= HW_BREAKPOINT_R;
-
- if (str[1] == 'w')
- access |= HW_BREAKPOINT_W;
-
- if (str[2] == 'x')
- access |= HW_BREAKPOINT_X;
-
- switch (access) {
- case HW_BREAKPOINT_R:
- case HW_BREAKPOINT_W:
- case HW_BREAKPOINT_W | HW_BREAKPOINT_R:
- return access;
- default:
- return -EINVAL;
- }
-}
-
-/*
- * There can be several possible malformed requests and we attempt to capture
- * all of them. We enumerate some of the rules
- * 1. We will not allow kernel symbols with ':' since it is used as a delimiter.
- * i.e. multiple ':' symbols disallowed. Possible uses are of the form
- * <module>:<ksym_name>:<op>.
- * 2. No delimiter symbol ':' in the input string
- * 3. Spurious operator symbols or symbols not in their respective positions
- * 4. <ksym_name>:--- i.e. clear breakpoint request when ksym_name not in file
- * 5. Kernel symbol not a part of /proc/kallsyms
- * 6. Duplicate requests
- */
-static int parse_ksym_trace_str(char *input_string, char **ksymname,
- unsigned long *addr)
-{
- int ret;
-
- *ksymname = strsep(&input_string, ":");
- *addr = kallsyms_lookup_name(*ksymname);
-
- /* Check for malformed request: (2), (1) and (5) */
- if ((!input_string) ||
- (strlen(input_string) != KSYM_TRACER_OP_LEN) ||
- (*addr == 0))
- return -EINVAL;;
-
- ret = ksym_trace_get_access_type(input_string);
-
- return ret;
-}
-
-int process_new_ksym_entry(char *ksymname, int op, unsigned long addr)
-{
- struct trace_ksym *entry;
- int ret = -ENOMEM;
-
- entry = kzalloc(sizeof(struct trace_ksym), GFP_KERNEL);
- if (!entry)
- return -ENOMEM;
-
- hw_breakpoint_init(&entry->attr);
-
- entry->attr.bp_type = op;
- entry->attr.bp_addr = addr;
- entry->attr.bp_len = HW_BREAKPOINT_LEN_4;
-
- entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr,
- ksym_hbp_handler);
-
- if (IS_ERR(entry->ksym_hbp)) {
- ret = PTR_ERR(entry->ksym_hbp);
- if (ret == -ENOSPC) {
- printk(KERN_ERR "ksym_tracer: Maximum limit reached."
- " No new requests for tracing can be accepted now.\n");
- } else {
- printk(KERN_INFO "ksym_tracer request failed. Try again"
- " later!!\n");
- }
- goto err;
- }
-
- hlist_add_head_rcu(&(entry->ksym_hlist), &ksym_filter_head);
-
- return 0;
-
-err:
- kfree(entry);
-
- return ret;
-}
-
-static ssize_t ksym_trace_filter_read(struct file *filp, char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- struct trace_ksym *entry;
- struct hlist_node *node;
- struct trace_seq *s;
- ssize_t cnt = 0;
- int ret;
-
- s = kmalloc(sizeof(*s), GFP_KERNEL);
- if (!s)
- return -ENOMEM;
- trace_seq_init(s);
-
- mutex_lock(&ksym_tracer_mutex);
-
- hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) {
- ret = trace_seq_printf(s, "%pS:",
- (void *)(unsigned long)entry->attr.bp_addr);
- if (entry->attr.bp_type == HW_BREAKPOINT_R)
- ret = trace_seq_puts(s, "r--\n");
- else if (entry->attr.bp_type == HW_BREAKPOINT_W)
- ret = trace_seq_puts(s, "-w-\n");
- else if (entry->attr.bp_type == (HW_BREAKPOINT_W | HW_BREAKPOINT_R))
- ret = trace_seq_puts(s, "rw-\n");
- WARN_ON_ONCE(!ret);
- }
-
- cnt = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
-
- mutex_unlock(&ksym_tracer_mutex);
-
- kfree(s);
-
- return cnt;
-}
-
-static void __ksym_trace_reset(void)
-{
- struct trace_ksym *entry;
- struct hlist_node *node, *node1;
-
- mutex_lock(&ksym_tracer_mutex);
- hlist_for_each_entry_safe(entry, node, node1, &ksym_filter_head,
- ksym_hlist) {
- unregister_wide_hw_breakpoint(entry->ksym_hbp);
- hlist_del_rcu(&(entry->ksym_hlist));
- synchronize_rcu();
- kfree(entry);
- }
- mutex_unlock(&ksym_tracer_mutex);
-}
-
-static ssize_t ksym_trace_filter_write(struct file *file,
- const char __user *buffer,
- size_t count, loff_t *ppos)
-{
- struct trace_ksym *entry;
- struct hlist_node *node;
- char *buf, *input_string, *ksymname = NULL;
- unsigned long ksym_addr = 0;
- int ret, op, changed = 0;
-
- buf = kzalloc(count + 1, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- ret = -EFAULT;
- if (copy_from_user(buf, buffer, count))
- goto out;
-
- buf[count] = '\0';
- input_string = strstrip(buf);
-
- /*
- * Clear all breakpoints if:
- * 1: echo > ksym_trace_filter
- * 2: echo 0 > ksym_trace_filter
- * 3: echo "*:---" > ksym_trace_filter
- */
- if (!input_string[0] || !strcmp(input_string, "0") ||
- !strcmp(input_string, "*:---")) {
- __ksym_trace_reset();
- ret = 0;
- goto out;
- }
-
- ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr);
- if (ret < 0)
- goto out;
-
- mutex_lock(&ksym_tracer_mutex);
-
- ret = -EINVAL;
- hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) {
- if (entry->attr.bp_addr == ksym_addr) {
- /* Check for malformed request: (6) */
- if (entry->attr.bp_type != op)
- changed = 1;
- else
- goto out_unlock;
- break;
- }
- }
- if (changed) {
- unregister_wide_hw_breakpoint(entry->ksym_hbp);
- entry->attr.bp_type = op;
- ret = 0;
- if (op > 0) {
- entry->ksym_hbp =
- register_wide_hw_breakpoint(&entry->attr,
- ksym_hbp_handler);
- if (IS_ERR(entry->ksym_hbp))
- ret = PTR_ERR(entry->ksym_hbp);
- else
- goto out_unlock;
- }
- /* Error or "symbol:---" case: drop it */
- hlist_del_rcu(&(entry->ksym_hlist));
- synchronize_rcu();
- kfree(entry);
- goto out_unlock;
- } else {
- /* Check for malformed request: (4) */
- if (op)
- ret = process_new_ksym_entry(ksymname, op, ksym_addr);
- }
-out_unlock:
- mutex_unlock(&ksym_tracer_mutex);
-out:
- kfree(buf);
- return !ret ? count : ret;
-}
-
-static const struct file_operations ksym_tracing_fops = {
- .open = tracing_open_generic,
- .read = ksym_trace_filter_read,
- .write = ksym_trace_filter_write,
-};
-
-static void ksym_trace_reset(struct trace_array *tr)
-{
- ksym_tracing_enabled = 0;
- __ksym_trace_reset();
-}
-
-static int ksym_trace_init(struct trace_array *tr)
-{
- int cpu, ret = 0;
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
- ksym_tracing_enabled = 1;
- ksym_trace_array = tr;
-
- return ret;
-}
-
-static void ksym_trace_print_header(struct seq_file *m)
-{
- seq_puts(m,
- "# TASK-PID CPU# Symbol "
- "Type Function\n");
- seq_puts(m,
- "# | | | "
- " | |\n");
-}
-
-static enum print_line_t ksym_trace_output(struct trace_iterator *iter)
-{
- struct trace_entry *entry = iter->ent;
- struct trace_seq *s = &iter->seq;
- struct ksym_trace_entry *field;
- char str[KSYM_SYMBOL_LEN];
- int ret;
-
- if (entry->type != TRACE_KSYM)
- return TRACE_TYPE_UNHANDLED;
-
- trace_assign_type(field, entry);
-
- ret = trace_seq_printf(s, "%11s-%-5d [%03d] %pS", field->cmd,
- entry->pid, iter->cpu, (char *)field->addr);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- switch (field->type) {
- case HW_BREAKPOINT_R:
- ret = trace_seq_printf(s, " R ");
- break;
- case HW_BREAKPOINT_W:
- ret = trace_seq_printf(s, " W ");
- break;
- case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
- ret = trace_seq_printf(s, " RW ");
- break;
- default:
- return TRACE_TYPE_PARTIAL_LINE;
- }
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- sprint_symbol(str, field->ip);
- ret = trace_seq_printf(s, "%s\n", str);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- return TRACE_TYPE_HANDLED;
-}
-
-struct tracer ksym_tracer __read_mostly =
-{
- .name = "ksym_tracer",
- .init = ksym_trace_init,
- .reset = ksym_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
- .selftest = trace_selftest_startup_ksym,
-#endif
- .print_header = ksym_trace_print_header,
- .print_line = ksym_trace_output
-};
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-static int ksym_profile_show(struct seq_file *m, void *v)
-{
- struct hlist_node *node;
- struct trace_ksym *entry;
- int access_type = 0;
- char fn_name[KSYM_NAME_LEN];
-
- seq_puts(m, " Access Type ");
- seq_puts(m, " Symbol Counter\n");
- seq_puts(m, " ----------- ");
- seq_puts(m, " ------ -------\n");
-
- rcu_read_lock();
- hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
-
- access_type = entry->attr.bp_type;
-
- switch (access_type) {
- case HW_BREAKPOINT_R:
- seq_puts(m, " R ");
- break;
- case HW_BREAKPOINT_W:
- seq_puts(m, " W ");
- break;
- case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
- seq_puts(m, " RW ");
- break;
- default:
- seq_puts(m, " NA ");
- }
-
- if (lookup_symbol_name(entry->attr.bp_addr, fn_name) >= 0)
- seq_printf(m, " %-36s", fn_name);
- else
- seq_printf(m, " %-36s", "<NA>");
- seq_printf(m, " %15llu\n",
- (unsigned long long)atomic64_read(&entry->counter));
- }
- rcu_read_unlock();
-
- return 0;
-}
-
-static int ksym_profile_open(struct inode *node, struct file *file)
-{
- return single_open(file, ksym_profile_show, NULL);
-}
-
-static const struct file_operations ksym_profile_fops = {
- .open = ksym_profile_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-__init static int init_ksym_trace(void)
-{
- struct dentry *d_tracer;
-
- d_tracer = tracing_init_dentry();
-
- trace_create_file("ksym_trace_filter", 0644, d_tracer,
- NULL, &ksym_tracing_fops);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
- trace_create_file("ksym_profile", 0444, d_tracer,
- NULL, &ksym_profile_fops);
-#endif
-
- return register_tracer(&ksym_tracer);
-}
-device_initcall(init_ksym_trace);
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 57c1b45..02272ba 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -16,9 +16,6 @@
DECLARE_RWSEM(trace_event_mutex);
-DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
-EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
-
static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
static int next_event_type = __TRACE_LAST_TYPE + 1;
@@ -1069,65 +1066,6 @@ static struct trace_event trace_wake_event = {
.funcs = &trace_wake_funcs,
};
-/* TRACE_SPECIAL */
-static enum print_line_t trace_special_print(struct trace_iterator *iter,
- int flags, struct trace_event *event)
-{
- struct special_entry *field;
-
- trace_assign_type(field, iter->ent);
-
- if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
- field->arg1,
- field->arg2,
- field->arg3))
- return TRACE_TYPE_PARTIAL_LINE;
-
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_hex(struct trace_iterator *iter,
- int flags, struct trace_event *event)
-{
- struct special_entry *field;
- struct trace_seq *s = &iter->seq;
-
- trace_assign_type(field, iter->ent);
-
- SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
- SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
- SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
-
- return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_bin(struct trace_iterator *iter,
- int flags, struct trace_event *event)
-{
- struct special_entry *field;
- struct trace_seq *s = &iter->seq;
-
- trace_assign_type(field, iter->ent);
-
- SEQ_PUT_FIELD_RET(s, field->arg1);
- SEQ_PUT_FIELD_RET(s, field->arg2);
- SEQ_PUT_FIELD_RET(s, field->arg3);
-
- return TRACE_TYPE_HANDLED;
-}
-
-static struct trace_event_functions trace_special_funcs = {
- .trace = trace_special_print,
- .raw = trace_special_print,
- .hex = trace_special_hex,
- .binary = trace_special_bin,
-};
-
-static struct trace_event trace_special_event = {
- .type = TRACE_SPECIAL,
- .funcs = &trace_special_funcs,
-};
-
/* TRACE_STACK */
static enum print_line_t trace_stack_print(struct trace_iterator *iter,
@@ -1161,9 +1099,6 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
static struct trace_event_functions trace_stack_funcs = {
.trace = trace_stack_print,
- .raw = trace_special_print,
- .hex = trace_special_hex,
- .binary = trace_special_bin,
};
static struct trace_event trace_stack_event = {
@@ -1194,9 +1129,6 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
static struct trace_event_functions trace_user_stack_funcs = {
.trace = trace_user_stack_print,
- .raw = trace_special_print,
- .hex = trace_special_hex,
- .binary = trace_special_bin,
};
static struct trace_event trace_user_stack_event = {
@@ -1314,7 +1246,6 @@ static struct trace_event *events[] __initdata = {
&trace_fn_event,
&trace_ctx_event,
&trace_wake_event,
- &trace_special_event,
&trace_stack_event,
&trace_user_stack_event,
&trace_bprint_event,
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 0e73bc2..4086eae6 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -46,7 +46,6 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
- int resched;
int cpu;
int pc;
@@ -54,7 +53,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
return;
pc = preempt_count();
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
cpu = raw_smp_processor_id();
if (cpu != wakeup_current_cpu)
@@ -74,7 +73,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
out:
atomic_dec(&data->disabled);
out_enable:
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
}
static struct ftrace_ops trace_ops __read_mostly =
@@ -383,6 +382,7 @@ static struct tracer wakeup_tracer __read_mostly =
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_wakeup,
#endif
+ .use_max_tr = 1,
};
static struct tracer wakeup_rt_tracer __read_mostly =
@@ -397,6 +397,7 @@ static struct tracer wakeup_rt_tracer __read_mostly =
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_wakeup,
#endif
+ .use_max_tr = 1,
};
__init static int init_wakeup_tracer(void)
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 250e7f9..155a415 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -13,11 +13,9 @@ static inline int trace_valid_entry(struct trace_entry *entry)
case TRACE_WAKE:
case TRACE_STACK:
case TRACE_PRINT:
- case TRACE_SPECIAL:
case TRACE_BRANCH:
case TRACE_GRAPH_ENT:
case TRACE_GRAPH_RET:
- case TRACE_KSYM:
return 1;
}
return 0;
@@ -691,38 +689,6 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
}
#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
-#ifdef CONFIG_SYSPROF_TRACER
-int
-trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
-{
- unsigned long count;
- int ret;
-
- /* start the tracing */
- ret = tracer_init(trace, tr);
- if (ret) {
- warn_failed_init_tracer(trace, ret);
- return ret;
- }
-
- /* Sleep for a 1/10 of a second */
- msleep(100);
- /* stop the tracing. */
- tracing_stop();
- /* check the trace buffer */
- ret = trace_test_buffer(tr, &count);
- trace->reset(tr);
- tracing_start();
-
- if (!ret && !count) {
- printk(KERN_CONT ".. no entries found ..");
- ret = -1;
- }
-
- return ret;
-}
-#endif /* CONFIG_SYSPROF_TRACER */
-
#ifdef CONFIG_BRANCH_TRACER
int
trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
@@ -755,56 +721,3 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
}
#endif /* CONFIG_BRANCH_TRACER */
-#ifdef CONFIG_KSYM_TRACER
-static int ksym_selftest_dummy;
-
-int
-trace_selftest_startup_ksym(struct tracer *trace, struct trace_array *tr)
-{
- unsigned long count;
- int ret;
-
- /* start the tracing */
- ret = tracer_init(trace, tr);
- if (ret) {
- warn_failed_init_tracer(trace, ret);
- return ret;
- }
-
- ksym_selftest_dummy = 0;
- /* Register the read-write tracing request */
-
- ret = process_new_ksym_entry("ksym_selftest_dummy",
- HW_BREAKPOINT_R | HW_BREAKPOINT_W,
- (unsigned long)(&ksym_selftest_dummy));
-
- if (ret < 0) {
- printk(KERN_CONT "ksym_trace read-write startup test failed\n");
- goto ret_path;
- }
- /* Perform a read and a write operation over the dummy variable to
- * trigger the tracer
- */
- if (ksym_selftest_dummy == 0)
- ksym_selftest_dummy++;
-
- /* stop the tracing. */
- tracing_stop();
- /* check the trace buffer */
- ret = trace_test_buffer(tr, &count);
- trace->reset(tr);
- tracing_start();
-
- /* read & write operations - one each is performed on the dummy variable
- * triggering two entries in the trace buffer
- */
- if (!ret && count != 2) {
- printk(KERN_CONT "Ksym tracer startup test failed");
- ret = -1;
- }
-
-ret_path:
- return ret;
-}
-#endif /* CONFIG_KSYM_TRACER */
-
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index f4bc9b2..056468e 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -110,12 +110,12 @@ static inline void check_stack(void)
static void
stack_trace_call(unsigned long ip, unsigned long parent_ip)
{
- int cpu, resched;
+ int cpu;
if (unlikely(!ftrace_enabled || stack_trace_disabled))
return;
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
cpu = raw_smp_processor_id();
/* no atomic needed, we only modify this variable by this cpu */
@@ -127,7 +127,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
out:
per_cpu(trace_active, cpu)--;
/* prevent recursion in schedule */
- ftrace_preempt_enable(resched);
+ preempt_enable_notrace();
}
static struct ftrace_ops trace_ops __read_mostly =
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 34e3580..bac752f 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -23,6 +23,9 @@ static int syscall_exit_register(struct ftrace_event_call *event,
static int syscall_enter_define_fields(struct ftrace_event_call *call);
static int syscall_exit_define_fields(struct ftrace_event_call *call);
+/* All syscall exit events have the same fields */
+static LIST_HEAD(syscall_exit_fields);
+
static struct list_head *
syscall_get_enter_fields(struct ftrace_event_call *call)
{
@@ -34,9 +37,7 @@ syscall_get_enter_fields(struct ftrace_event_call *call)
static struct list_head *
syscall_get_exit_fields(struct ftrace_event_call *call)
{
- struct syscall_metadata *entry = call->data;
-
- return &entry->exit_fields;
+ return &syscall_exit_fields;
}
struct trace_event_functions enter_syscall_print_funcs = {
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
deleted file mode 100644
index a7974a5..0000000
--- a/kernel/trace/trace_sysprof.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- * trace stack traces
- *
- * Copyright (C) 2004-2008, Soeren Sandmann
- * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>
- * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
- */
-#include <linux/kallsyms.h>
-#include <linux/debugfs.h>
-#include <linux/hrtimer.h>
-#include <linux/uaccess.h>
-#include <linux/ftrace.h>
-#include <linux/module.h>
-#include <linux/irq.h>
-#include <linux/fs.h>
-
-#include <asm/stacktrace.h>
-
-#include "trace.h"
-
-static struct trace_array *sysprof_trace;
-static int __read_mostly tracer_enabled;
-
-/*
- * 1 msec sample interval by default:
- */
-static unsigned long sample_period = 1000000;
-static const unsigned int sample_max_depth = 512;
-
-static DEFINE_MUTEX(sample_timer_lock);
-/*
- * Per CPU hrtimers that do the profiling:
- */
-static DEFINE_PER_CPU(struct hrtimer, stack_trace_hrtimer);
-
-struct stack_frame {
- const void __user *next_fp;
- unsigned long return_address;
-};
-
-static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
-{
- int ret;
-
- if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
- return 0;
-
- ret = 1;
- pagefault_disable();
- if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
- ret = 0;
- pagefault_enable();
-
- return ret;
-}
-
-struct backtrace_info {
- struct trace_array_cpu *data;
- struct trace_array *tr;
- int pos;
-};
-
-static void
-backtrace_warning_symbol(void *data, char *msg, unsigned long symbol)
-{
- /* Ignore warnings */
-}
-
-static void backtrace_warning(void *data, char *msg)
-{
- /* Ignore warnings */
-}
-
-static int backtrace_stack(void *data, char *name)
-{
- /* Don't bother with IRQ stacks for now */
- return -1;
-}
-
-static void backtrace_address(void *data, unsigned long addr, int reliable)
-{
- struct backtrace_info *info = data;
-
- if (info->pos < sample_max_depth && reliable) {
- __trace_special(info->tr, info->data, 1, addr, 0);
-
- info->pos++;
- }
-}
-
-static const struct stacktrace_ops backtrace_ops = {
- .warning = backtrace_warning,
- .warning_symbol = backtrace_warning_symbol,
- .stack = backtrace_stack,
- .address = backtrace_address,
- .walk_stack = print_context_stack,
-};
-
-static int
-trace_kernel(struct pt_regs *regs, struct trace_array *tr,
- struct trace_array_cpu *data)
-{
- struct backtrace_info info;
- unsigned long bp;
- char *stack;
-
- info.tr = tr;
- info.data = data;
- info.pos = 1;
-
- __trace_special(info.tr, info.data, 1, regs->ip, 0);
-
- stack = ((char *)regs + sizeof(struct pt_regs));
-#ifdef CONFIG_FRAME_POINTER
- bp = regs->bp;
-#else
- bp = 0;
-#endif
-
- dump_trace(NULL, regs, (void *)stack, bp, &backtrace_ops, &info);
-
- return info.pos;
-}
-
-static void timer_notify(struct pt_regs *regs, int cpu)
-{
- struct trace_array_cpu *data;
- struct stack_frame frame;
- struct trace_array *tr;
- const void __user *fp;
- int is_user;
- int i;
-
- if (!regs)
- return;
-
- tr = sysprof_trace;
- data = tr->data[cpu];
- is_user = user_mode(regs);
-
- if (!current || current->pid == 0)
- return;
-
- if (is_user && current->state != TASK_RUNNING)
- return;
-
- __trace_special(tr, data, 0, 0, current->pid);
-
- if (!is_user)
- i = trace_kernel(regs, tr, data);
- else
- i = 0;
-
- /*
- * Trace user stack if we are not a kernel thread
- */
- if (current->mm && i < sample_max_depth) {
- regs = (struct pt_regs *)current->thread.sp0 - 1;
-
- fp = (void __user *)regs->bp;
-
- __trace_special(tr, data, 2, regs->ip, 0);
-
- while (i < sample_max_depth) {
- frame.next_fp = NULL;
- frame.return_address = 0;
- if (!copy_stack_frame(fp, &frame))
- break;
- if ((unsigned long)fp < regs->sp)
- break;
-
- __trace_special(tr, data, 2, frame.return_address,
- (unsigned long)fp);
- fp = frame.next_fp;
-
- i++;
- }
-
- }
-
- /*
- * Special trace entry if we overflow the max depth:
- */
- if (i == sample_max_depth)
- __trace_special(tr, data, -1, -1, -1);
-
- __trace_special(tr, data, 3, current->pid, i);
-}
-
-static enum hrtimer_restart stack_trace_timer_fn(struct hrtimer *hrtimer)
-{
- /* trace here */
- timer_notify(get_irq_regs(), smp_processor_id());
-
- hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period));
-
- return HRTIMER_RESTART;
-}
-
-static void start_stack_timer(void *unused)
-{
- struct hrtimer *hrtimer = &__get_cpu_var(stack_trace_hrtimer);
-
- hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- hrtimer->function = stack_trace_timer_fn;
-
- hrtimer_start(hrtimer, ns_to_ktime(sample_period),
- HRTIMER_MODE_REL_PINNED);
-}
-
-static void start_stack_timers(void)
-{
- on_each_cpu(start_stack_timer, NULL, 1);
-}
-
-static void stop_stack_timer(int cpu)
-{
- struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
-
- hrtimer_cancel(hrtimer);
-}
-
-static void stop_stack_timers(void)
-{
- int cpu;
-
- for_each_online_cpu(cpu)
- stop_stack_timer(cpu);
-}
-
-static void stop_stack_trace(struct trace_array *tr)
-{
- mutex_lock(&sample_timer_lock);
- stop_stack_timers();
- tracer_enabled = 0;
- mutex_unlock(&sample_timer_lock);
-}
-
-static int stack_trace_init(struct trace_array *tr)
-{
- sysprof_trace = tr;
-
- tracing_start_cmdline_record();
-
- mutex_lock(&sample_timer_lock);
- start_stack_timers();
- tracer_enabled = 1;
- mutex_unlock(&sample_timer_lock);
- return 0;
-}
-
-static void stack_trace_reset(struct trace_array *tr)
-{
- tracing_stop_cmdline_record();
- stop_stack_trace(tr);
-}
-
-static struct tracer stack_trace __read_mostly =
-{
- .name = "sysprof",
- .init = stack_trace_init,
- .reset = stack_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
- .selftest = trace_selftest_startup_sysprof,
-#endif
-};
-
-__init static int init_stack_trace(void)
-{
- return register_tracer(&stack_trace);
-}
-device_initcall(init_stack_trace);
-
-#define MAX_LONG_DIGITS 22
-
-static ssize_t
-sysprof_sample_read(struct file *filp, char __user *ubuf,
- size_t cnt, loff_t *ppos)
-{
- char buf[MAX_LONG_DIGITS];
- int r;
-
- r = sprintf(buf, "%ld\n", nsecs_to_usecs(sample_period));
-
- return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-}
-
-static ssize_t
-sysprof_sample_write(struct file *filp, const char __user *ubuf,
- size_t cnt, loff_t *ppos)
-{
- char buf[MAX_LONG_DIGITS];
- unsigned long val;
-
- if (cnt > MAX_LONG_DIGITS-1)
- cnt = MAX_LONG_DIGITS-1;
-
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
-
- buf[cnt] = 0;
-
- val = simple_strtoul(buf, NULL, 10);
- /*
- * Enforce a minimum sample period of 100 usecs:
- */
- if (val < 100)
- val = 100;
-
- mutex_lock(&sample_timer_lock);
- stop_stack_timers();
- sample_period = val * 1000;
- start_stack_timers();
- mutex_unlock(&sample_timer_lock);
-
- return cnt;
-}
-
-static const struct file_operations sysprof_sample_fops = {
- .read = sysprof_sample_read,
- .write = sysprof_sample_write,
-};
-
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
-{
-
- trace_create_file("sysprof_sample_period", 0644,
- d_tracer, NULL, &sysprof_sample_fops);
-}
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