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-rw-r--r--kernel/trace/kmemtrace.c319
-rw-r--r--kernel/trace/trace.h6
2 files changed, 228 insertions, 97 deletions
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
index ae201b3..5011f4d 100644
--- a/kernel/trace/kmemtrace.c
+++ b/kernel/trace/kmemtrace.c
@@ -6,14 +6,16 @@
* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
*/
-#include <linux/dcache.h>
+#include <linux/tracepoint.h>
+#include <linux/seq_file.h>
#include <linux/debugfs.h>
+#include <linux/dcache.h>
#include <linux/fs.h>
-#include <linux/seq_file.h>
+
#include <trace/kmemtrace.h>
-#include "trace.h"
#include "trace_output.h"
+#include "trace.h"
/* Select an alternative, minimalistic output than the original one */
#define TRACE_KMEM_OPT_MINIMAL 0x1
@@ -25,14 +27,156 @@ static struct tracer_opt kmem_opts[] = {
};
static struct tracer_flags kmem_tracer_flags = {
- .val = 0,
- .opts = kmem_opts
+ .val = 0,
+ .opts = kmem_opts
};
-
-static bool kmem_tracing_enabled __read_mostly;
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 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;
+
+ 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 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;
+
+ ring_buffer_unlock_commit(tr->buffer, event);
+
+ trace_wake_up();
+}
+
+static void kmemtrace_kmalloc(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(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(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(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(unsigned long call_site, const void *ptr)
+{
+ kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
+}
+
+static void kmemtrace_kmem_cache_free(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);
+ if (err)
+ return err;
+ err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
+ if (err)
+ return err;
+ err = register_trace_kmalloc_node(kmemtrace_kmalloc_node);
+ if (err)
+ return err;
+ err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
+ if (err)
+ return err;
+ err = register_trace_kfree(kmemtrace_kfree);
+ if (err)
+ return err;
+ err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
+
+ return err;
+}
+
+static void kmemtrace_stop_probes(void)
+{
+ unregister_trace_kmalloc(kmemtrace_kmalloc);
+ unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
+ unregister_trace_kmalloc_node(kmemtrace_kmalloc_node);
+ unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
+ unregister_trace_kfree(kmemtrace_kfree);
+ unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
+}
+
static int kmem_trace_init(struct trace_array *tr)
{
int cpu;
@@ -41,14 +185,14 @@ static int kmem_trace_init(struct trace_array *tr)
for_each_cpu_mask(cpu, cpu_possible_map)
tracing_reset(tr, cpu);
- kmem_tracing_enabled = true;
+ kmemtrace_start_probes();
return 0;
}
static void kmem_trace_reset(struct trace_array *tr)
{
- kmem_tracing_enabled = false;
+ kmemtrace_stop_probes();
}
static void kmemtrace_headers(struct seq_file *s)
@@ -66,47 +210,84 @@ static void kmemtrace_headers(struct seq_file *s)
}
/*
- * The two following functions give the original output from kmemtrace,
- * or something close to....perhaps they need some missing things
+ * 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_original(struct trace_iterator *iter,
- struct kmemtrace_alloc_entry *entry)
+kmemtrace_print_alloc_user(struct trace_iterator *iter,
+ struct kmemtrace_alloc_entry *entry)
{
+ struct kmemtrace_user_event_alloc *ev_alloc;
struct trace_seq *s = &iter->seq;
- int ret;
+ struct kmemtrace_user_event *ev;
+
+ ev = trace_seq_reserve(s, sizeof(*ev));
+ if (!ev)
+ return TRACE_TYPE_PARTIAL_LINE;
- /* Taken from the old linux/kmemtrace.h */
- ret = trace_seq_printf(s, "type_id %d call_site %lu ptr %lu "
- "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
- entry->type_id, entry->call_site, (unsigned long) entry->ptr,
- (unsigned long) entry->bytes_req, (unsigned long) entry->bytes_alloc,
- (unsigned long) entry->gfp_flags, entry->node);
+ 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;
- if (!ret)
+ 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_original(struct trace_iterator *iter,
- struct kmemtrace_free_entry *entry)
+kmemtrace_print_free_user(struct trace_iterator *iter,
+ struct kmemtrace_free_entry *entry)
{
struct trace_seq *s = &iter->seq;
- int ret;
+ struct kmemtrace_user_event *ev;
- /* Taken from the old linux/kmemtrace.h */
- ret = trace_seq_printf(s, "type_id %d call_site %lu ptr %lu\n",
- entry->type_id, entry->call_site, (unsigned long) entry->ptr);
-
- if (!ret)
+ 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,
@@ -178,7 +359,7 @@ kmemtrace_print_alloc_compress(struct trace_iterator *iter,
static enum print_line_t
kmemtrace_print_free_compress(struct trace_iterator *iter,
- struct kmemtrace_free_entry *entry)
+ struct kmemtrace_free_entry *entry)
{
struct trace_seq *s = &iter->seq;
int ret;
@@ -239,20 +420,22 @@ static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
switch (entry->type) {
case TRACE_KMEM_ALLOC: {
struct kmemtrace_alloc_entry *field;
+
trace_assign_type(field, entry);
if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
return kmemtrace_print_alloc_compress(iter, field);
else
- return kmemtrace_print_alloc_original(iter, field);
+ return kmemtrace_print_alloc_user(iter, field);
}
case TRACE_KMEM_FREE: {
struct kmemtrace_free_entry *field;
+
trace_assign_type(field, entry);
if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
return kmemtrace_print_free_compress(iter, field);
else
- return kmemtrace_print_free_original(iter, field);
+ return kmemtrace_print_free_user(iter, field);
}
default:
@@ -260,70 +443,13 @@ static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
}
}
-/* Trace allocations */
-void kmemtrace_mark_alloc_node(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 ring_buffer_event *event;
- struct kmemtrace_alloc_entry *entry;
- struct trace_array *tr = kmemtrace_array;
-
- if (!kmem_tracing_enabled)
- return;
-
- event = trace_buffer_lock_reserve(tr, TRACE_KMEM_ALLOC,
- sizeof(*entry), 0, 0);
- if (!event)
- return;
- entry = ring_buffer_event_data(event);
-
- 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;
-
- trace_buffer_unlock_commit(tr, event, 0, 0);
-}
-EXPORT_SYMBOL(kmemtrace_mark_alloc_node);
-
-void kmemtrace_mark_free(enum kmemtrace_type_id type_id,
- unsigned long call_site,
- const void *ptr)
-{
- struct ring_buffer_event *event;
- struct kmemtrace_free_entry *entry;
- struct trace_array *tr = kmemtrace_array;
-
- if (!kmem_tracing_enabled)
- return;
-
- event = trace_buffer_lock_reserve(tr, TRACE_KMEM_FREE,
- sizeof(*entry), 0, 0);
- if (!event)
- return;
- entry = ring_buffer_event_data(event);
- entry->type_id = type_id;
- entry->call_site = call_site;
- entry->ptr = ptr;
-
- trace_buffer_unlock_commit(tr, event, 0, 0);
-}
-EXPORT_SYMBOL(kmemtrace_mark_free);
-
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
+ .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)
@@ -335,5 +461,4 @@ static int __init init_kmem_tracer(void)
{
return register_tracer(&kmem_tracer);
}
-
device_initcall(init_kmem_tracer);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index cb0ce3f..cbc168f 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -182,6 +182,12 @@ struct trace_power {
struct power_trace state_data;
};
+enum kmemtrace_type_id {
+ KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
+ KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */
+ KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
+};
+
struct kmemtrace_alloc_entry {
struct trace_entry ent;
enum kmemtrace_type_id type_id;
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