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-rw-r--r--kernel/trace/trace_functions_graph.c570
1 files changed, 357 insertions, 213 deletions
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index dce71a5..d28687e 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1,7 +1,7 @@
/*
*
* Function graph tracer.
- * Copyright (c) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ * Copyright (c) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com>
* Mostly borrowed from function tracer which
* is Copyright (c) Steven Rostedt <srostedt@redhat.com>
*
@@ -12,6 +12,12 @@
#include <linux/fs.h>
#include "trace.h"
+#include "trace_output.h"
+
+struct fgraph_data {
+ pid_t last_pid;
+ int depth;
+};
#define TRACE_GRAPH_INDENT 2
@@ -20,9 +26,11 @@
#define TRACE_GRAPH_PRINT_CPU 0x2
#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
#define TRACE_GRAPH_PRINT_PROC 0x8
+#define TRACE_GRAPH_PRINT_DURATION 0x10
+#define TRACE_GRAPH_PRINT_ABS_TIME 0X20
static struct tracer_opt trace_opts[] = {
- /* Display overruns ? */
+ /* Display overruns? (for self-debug purpose) */
{ TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
/* Display CPU ? */
{ TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
@@ -30,23 +38,28 @@ static struct tracer_opt trace_opts[] = {
{ TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
/* Display proc name/pid */
{ TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
+ /* Display duration of execution */
+ { TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
+ /* Display absolute time of an entry */
+ { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
{ } /* Empty entry */
};
static struct tracer_flags tracer_flags = {
/* Don't display overruns and proc by default */
- .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD,
+ .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
+ TRACE_GRAPH_PRINT_DURATION,
.opts = trace_opts
};
/* pid on the last trace processed */
-static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
+
/* Add a function return address to the trace stack on thread info.*/
int
-ftrace_push_return_trace(unsigned long ret, unsigned long long time,
- unsigned long func, int *depth)
+ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
{
+ unsigned long long calltime;
int index;
if (!current->ret_stack)
@@ -58,11 +71,13 @@ ftrace_push_return_trace(unsigned long ret, unsigned long long time,
return -EBUSY;
}
+ calltime = trace_clock_local();
+
index = ++current->curr_ret_stack;
barrier();
current->ret_stack[index].ret = ret;
current->ret_stack[index].func = func;
- current->ret_stack[index].calltime = time;
+ current->ret_stack[index].calltime = calltime;
*depth = index;
return 0;
@@ -104,7 +119,7 @@ unsigned long ftrace_return_to_handler(void)
unsigned long ret;
ftrace_pop_return_trace(&trace, &ret);
- trace.rettime = cpu_clock(raw_smp_processor_id());
+ trace.rettime = trace_clock_local();
ftrace_graph_return(&trace);
if (unlikely(!ret)) {
@@ -119,12 +134,7 @@ unsigned long ftrace_return_to_handler(void)
static int graph_trace_init(struct trace_array *tr)
{
- int cpu, ret;
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
-
- ret = register_ftrace_graph(&trace_graph_return,
+ int ret = register_ftrace_graph(&trace_graph_return,
&trace_graph_entry);
if (ret)
return ret;
@@ -187,15 +197,15 @@ print_graph_cpu(struct trace_seq *s, int cpu)
static enum print_line_t
print_graph_proc(struct trace_seq *s, pid_t pid)
{
- int i;
- int ret;
- int len;
- char comm[8];
- int spaces = 0;
+ char comm[TASK_COMM_LEN];
/* sign + log10(MAX_INT) + '\0' */
char pid_str[11];
+ int spaces = 0;
+ int ret;
+ int len;
+ int i;
- strncpy(comm, trace_find_cmdline(pid), 7);
+ trace_find_cmdline(pid, comm);
comm[7] = '\0';
sprintf(pid_str, "%d", pid);
@@ -228,17 +238,25 @@ print_graph_proc(struct trace_seq *s, pid_t pid)
/* If the pid changed since the last trace, output this event */
static enum print_line_t
-verif_pid(struct trace_seq *s, pid_t pid, int cpu)
+verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data)
{
pid_t prev_pid;
+ pid_t *last_pid;
int ret;
- if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
+ if (!data)
+ return TRACE_TYPE_HANDLED;
+
+ last_pid = &(per_cpu_ptr(data, cpu)->last_pid);
+
+ if (*last_pid == pid)
return TRACE_TYPE_HANDLED;
- prev_pid = last_pid[cpu];
- last_pid[cpu] = pid;
+ prev_pid = *last_pid;
+ *last_pid = pid;
+ if (prev_pid == -1)
+ return TRACE_TYPE_HANDLED;
/*
* Context-switch trace line:
@@ -250,34 +268,34 @@ verif_pid(struct trace_seq *s, pid_t pid, int cpu)
ret = trace_seq_printf(s,
" ------------------------------------------\n");
if (!ret)
- TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_PARTIAL_LINE;
ret = print_graph_cpu(s, cpu);
if (ret == TRACE_TYPE_PARTIAL_LINE)
- TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_PARTIAL_LINE;
ret = print_graph_proc(s, prev_pid);
if (ret == TRACE_TYPE_PARTIAL_LINE)
- TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_PARTIAL_LINE;
ret = trace_seq_printf(s, " => ");
if (!ret)
- TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_PARTIAL_LINE;
ret = print_graph_proc(s, pid);
if (ret == TRACE_TYPE_PARTIAL_LINE)
- TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_PARTIAL_LINE;
ret = trace_seq_printf(s,
"\n ------------------------------------------\n\n");
if (!ret)
- TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_PARTIAL_LINE;
- return ret;
+ return TRACE_TYPE_HANDLED;
}
-static bool
-trace_branch_is_leaf(struct trace_iterator *iter,
+static struct ftrace_graph_ret_entry *
+get_return_for_leaf(struct trace_iterator *iter,
struct ftrace_graph_ent_entry *curr)
{
struct ring_buffer_iter *ring_iter;
@@ -286,65 +304,123 @@ trace_branch_is_leaf(struct trace_iterator *iter,
ring_iter = iter->buffer_iter[iter->cpu];
- if (!ring_iter)
- return false;
-
- event = ring_buffer_iter_peek(ring_iter, NULL);
+ /* First peek to compare current entry and the next one */
+ if (ring_iter)
+ event = ring_buffer_iter_peek(ring_iter, NULL);
+ else {
+ /* We need to consume the current entry to see the next one */
+ ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
+ event = ring_buffer_peek(iter->tr->buffer, iter->cpu,
+ NULL);
+ }
if (!event)
- return false;
+ return NULL;
next = ring_buffer_event_data(event);
if (next->ent.type != TRACE_GRAPH_RET)
- return false;
+ return NULL;
if (curr->ent.pid != next->ent.pid ||
curr->graph_ent.func != next->ret.func)
- return false;
+ return NULL;
+
+ /* this is a leaf, now advance the iterator */
+ if (ring_iter)
+ ring_buffer_read(ring_iter, NULL);
+
+ return next;
+}
+
+/* Signal a overhead of time execution to the output */
+static int
+print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+{
+ /* If duration disappear, we don't need anything */
+ if (!(tracer_flags.val & TRACE_GRAPH_PRINT_DURATION))
+ return 1;
+
+ /* Non nested entry or return */
+ if (duration == -1)
+ return trace_seq_printf(s, " ");
+
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+ /* Duration exceeded 100 msecs */
+ if (duration > 100000ULL)
+ return trace_seq_printf(s, "! ");
+
+ /* Duration exceeded 10 msecs */
+ if (duration > 10000ULL)
+ return trace_seq_printf(s, "+ ");
+ }
+
+ return trace_seq_printf(s, " ");
+}
+
+static int print_graph_abs_time(u64 t, struct trace_seq *s)
+{
+ unsigned long usecs_rem;
+
+ usecs_rem = do_div(t, NSEC_PER_SEC);
+ usecs_rem /= 1000;
- return true;
+ return trace_seq_printf(s, "%5lu.%06lu | ",
+ (unsigned long)t, usecs_rem);
}
static enum print_line_t
-print_graph_irq(struct trace_seq *s, unsigned long addr,
- enum trace_type type, int cpu, pid_t pid)
+print_graph_irq(struct trace_iterator *iter, unsigned long addr,
+ enum trace_type type, int cpu, pid_t pid)
{
int ret;
+ struct trace_seq *s = &iter->seq;
if (addr < (unsigned long)__irqentry_text_start ||
addr >= (unsigned long)__irqentry_text_end)
return TRACE_TYPE_UNHANDLED;
- if (type == TRACE_GRAPH_ENT) {
- ret = trace_seq_printf(s, "==========> | ");
- } else {
- /* Cpu */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
- ret = print_graph_cpu(s, cpu);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- /* Proc */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
- ret = print_graph_proc(s, pid);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ /* Absolute time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+ ret = print_graph_abs_time(iter->ts, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
- ret = trace_seq_printf(s, " | ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ /* Cpu */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+ ret = print_graph_cpu(s, cpu);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+ /* Proc */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+ ret = print_graph_proc(s, pid);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ ret = trace_seq_printf(s, " | ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
- /* No overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = trace_seq_printf(s, " ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ /* No overhead */
+ ret = print_graph_overhead(-1, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ if (type == TRACE_GRAPH_ENT)
+ ret = trace_seq_printf(s, "==========>");
+ else
+ ret = trace_seq_printf(s, "<==========");
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Don't close the duration column if haven't one */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+ trace_seq_printf(s, " |");
+ ret = trace_seq_printf(s, "\n");
- ret = trace_seq_printf(s, "<========== |\n");
- }
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
@@ -363,7 +439,7 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
sprintf(msecs_str, "%lu", (unsigned long) duration);
/* Print msecs */
- ret = trace_seq_printf(s, msecs_str);
+ ret = trace_seq_printf(s, "%s", msecs_str);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
@@ -396,52 +472,47 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
}
-/* Signal a overhead of time execution to the output */
-static int
-print_graph_overhead(unsigned long long duration, struct trace_seq *s)
-{
- /* Duration exceeded 100 msecs */
- if (duration > 100000ULL)
- return trace_seq_printf(s, "! ");
-
- /* Duration exceeded 10 msecs */
- if (duration > 10000ULL)
- return trace_seq_printf(s, "+ ");
-
- return trace_seq_printf(s, " ");
-}
-
/* Case of a leaf function on its call entry */
static enum print_line_t
print_graph_entry_leaf(struct trace_iterator *iter,
- struct ftrace_graph_ent_entry *entry, struct trace_seq *s)
+ struct ftrace_graph_ent_entry *entry,
+ struct ftrace_graph_ret_entry *ret_entry, struct trace_seq *s)
{
- struct ftrace_graph_ret_entry *ret_entry;
+ struct fgraph_data *data = iter->private;
struct ftrace_graph_ret *graph_ret;
- struct ring_buffer_event *event;
struct ftrace_graph_ent *call;
unsigned long long duration;
int ret;
int i;
- event = ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
- ret_entry = ring_buffer_event_data(event);
graph_ret = &ret_entry->ret;
call = &entry->graph_ent;
duration = graph_ret->rettime - graph_ret->calltime;
- /* Overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = print_graph_overhead(duration, s);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
+ if (data) {
+ int cpu = iter->cpu;
+ int *depth = &(per_cpu_ptr(data, cpu)->depth);
+
+ /*
+ * Comments display at + 1 to depth. Since
+ * this is a leaf function, keep the comments
+ * equal to this depth.
+ */
+ *depth = call->depth - 1;
}
- /* Duration */
- ret = print_graph_duration(duration, s);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
+ /* Overhead */
+ ret = print_graph_overhead(duration, s);
+ if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
+ /* Duration */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+ ret = print_graph_duration(duration, s);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
ret = trace_seq_printf(s, " ");
@@ -461,33 +532,34 @@ print_graph_entry_leaf(struct trace_iterator *iter,
}
static enum print_line_t
-print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
- struct trace_seq *s, pid_t pid, int cpu)
+print_graph_entry_nested(struct trace_iterator *iter,
+ struct ftrace_graph_ent_entry *entry,
+ struct trace_seq *s, int cpu)
{
- int i;
- int ret;
struct ftrace_graph_ent *call = &entry->graph_ent;
+ struct fgraph_data *data = iter->private;
+ int ret;
+ int i;
- /* No overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = trace_seq_printf(s, " ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
+ if (data) {
+ int cpu = iter->cpu;
+ int *depth = &(per_cpu_ptr(data, cpu)->depth);
+
+ *depth = call->depth;
}
- /* Interrupt */
- ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
- if (ret == TRACE_TYPE_UNHANDLED) {
- /* No time */
+ /* No overhead */
+ ret = print_graph_overhead(-1, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* No time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
ret = trace_seq_printf(s, " | ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- } else {
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
}
-
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
ret = trace_seq_printf(s, " ");
@@ -503,20 +575,40 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- return TRACE_TYPE_HANDLED;
+ /*
+ * we already consumed the current entry to check the next one
+ * and see if this is a leaf.
+ */
+ return TRACE_TYPE_NO_CONSUME;
}
static enum print_line_t
-print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
- struct trace_iterator *iter, int cpu)
+print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
+ int type, unsigned long addr)
{
- int ret;
+ struct fgraph_data *data = iter->private;
struct trace_entry *ent = iter->ent;
+ int cpu = iter->cpu;
+ int ret;
/* Pid */
- if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+ if (verif_pid(s, ent->pid, cpu, data) == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
+ if (type) {
+ /* Interrupt */
+ ret = print_graph_irq(iter, addr, type, cpu, ent->pid);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
+ /* Absolute time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+ ret = print_graph_abs_time(iter->ts, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
/* Cpu */
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
ret = print_graph_cpu(s, cpu);
@@ -535,54 +627,65 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
return TRACE_TYPE_PARTIAL_LINE;
}
- if (trace_branch_is_leaf(iter, field))
- return print_graph_entry_leaf(iter, field, s);
+ return 0;
+}
+
+static enum print_line_t
+print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
+ struct trace_iterator *iter)
+{
+ int cpu = iter->cpu;
+ struct ftrace_graph_ent *call = &field->graph_ent;
+ struct ftrace_graph_ret_entry *leaf_ret;
+
+ if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ leaf_ret = get_return_for_leaf(iter, field);
+ if (leaf_ret)
+ return print_graph_entry_leaf(iter, field, leaf_ret, s);
else
- return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
+ return print_graph_entry_nested(iter, field, s, cpu);
}
static enum print_line_t
print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
- struct trace_entry *ent, int cpu)
+ struct trace_entry *ent, struct trace_iterator *iter)
{
- int i;
- int ret;
unsigned long long duration = trace->rettime - trace->calltime;
+ struct fgraph_data *data = iter->private;
+ pid_t pid = ent->pid;
+ int cpu = iter->cpu;
+ int ret;
+ int i;
- /* Pid */
- if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ if (data) {
+ int cpu = iter->cpu;
+ int *depth = &(per_cpu_ptr(data, cpu)->depth);
- /* Cpu */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
- ret = print_graph_cpu(s, cpu);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ /*
+ * Comments display at + 1 to depth. This is the
+ * return from a function, we now want the comments
+ * to display at the same level of the bracket.
+ */
+ *depth = trace->depth - 1;
}
- /* Proc */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
- ret = print_graph_proc(s, ent->pid);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
-
- ret = trace_seq_printf(s, " | ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ if (print_graph_prologue(iter, s, 0, 0))
+ return TRACE_TYPE_PARTIAL_LINE;
/* Overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = print_graph_overhead(duration, s);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ ret = print_graph_overhead(duration, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
/* Duration */
- ret = print_graph_duration(duration, s);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+ ret = print_graph_duration(duration, s);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
/* Closing brace */
for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
@@ -603,7 +706,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
return TRACE_TYPE_PARTIAL_LINE;
}
- ret = print_graph_irq(s, trace->func, TRACE_GRAPH_RET, cpu, ent->pid);
+ ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET, cpu, pid);
if (ret == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
@@ -611,61 +714,73 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
}
static enum print_line_t
-print_graph_comment(struct print_entry *trace, struct trace_seq *s,
- struct trace_entry *ent, struct trace_iterator *iter)
+print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
+ struct trace_iterator *iter)
{
- int i;
+ unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+ struct fgraph_data *data = iter->private;
+ struct trace_event *event;
+ int depth = 0;
int ret;
+ int i;
- /* Pid */
- if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
-
- /* Cpu */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
- ret = print_graph_cpu(s, iter->cpu);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
- }
-
- /* Proc */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
- ret = print_graph_proc(s, ent->pid);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ if (data)
+ depth = per_cpu_ptr(data, iter->cpu)->depth;
- ret = trace_seq_printf(s, " | ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ if (print_graph_prologue(iter, s, 0, 0))
+ return TRACE_TYPE_PARTIAL_LINE;
/* No overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = trace_seq_printf(s, " ");
+ ret = print_graph_overhead(-1, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* No time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+ ret = trace_seq_printf(s, " | ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
- /* No time */
- ret = trace_seq_printf(s, " | ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
/* Indentation */
- if (trace->depth > 0)
- for (i = 0; i < (trace->depth + 1) * TRACE_GRAPH_INDENT; i++) {
+ if (depth > 0)
+ for (i = 0; i < (depth + 1) * TRACE_GRAPH_INDENT; i++) {
ret = trace_seq_printf(s, " ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
/* The comment */
- ret = trace_seq_printf(s, "/* %s", trace->buf);
+ ret = trace_seq_printf(s, "/* ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- if (ent->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
+ switch (iter->ent->type) {
+ case TRACE_BPRINT:
+ ret = trace_print_bprintk_msg_only(iter);
+ if (ret != TRACE_TYPE_HANDLED)
+ return ret;
+ break;
+ case TRACE_PRINT:
+ ret = trace_print_printk_msg_only(iter);
+ if (ret != TRACE_TYPE_HANDLED)
+ return ret;
+ break;
+ default:
+ event = ftrace_find_event(ent->type);
+ if (!event)
+ return TRACE_TYPE_UNHANDLED;
+
+ ret = event->trace(iter, sym_flags);
+ if (ret != TRACE_TYPE_HANDLED)
+ return ret;
+ }
+
+ /* Strip ending newline */
+ if (s->buffer[s->len - 1] == '\n') {
+ s->buffer[s->len - 1] = '\0';
+ s->len--;
+ }
ret = trace_seq_printf(s, " */\n");
if (!ret)
@@ -678,62 +793,91 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
enum print_line_t
print_graph_function(struct trace_iterator *iter)
{
- struct trace_seq *s = &iter->seq;
struct trace_entry *entry = iter->ent;
+ struct trace_seq *s = &iter->seq;
switch (entry->type) {
case TRACE_GRAPH_ENT: {
struct ftrace_graph_ent_entry *field;
trace_assign_type(field, entry);
- return print_graph_entry(field, s, iter,
- iter->cpu);
+ return print_graph_entry(field, s, iter);
}
case TRACE_GRAPH_RET: {
struct ftrace_graph_ret_entry *field;
trace_assign_type(field, entry);
- return print_graph_return(&field->ret, s, entry, iter->cpu);
- }
- case TRACE_PRINT: {
- struct print_entry *field;
- trace_assign_type(field, entry);
- return print_graph_comment(field, s, entry, iter);
+ return print_graph_return(&field->ret, s, entry, iter);
}
default:
- return TRACE_TYPE_UNHANDLED;
+ return print_graph_comment(s, entry, iter);
}
+
+ return TRACE_TYPE_HANDLED;
}
static void print_graph_headers(struct seq_file *s)
{
/* 1st line */
seq_printf(s, "# ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+ seq_printf(s, " TIME ");
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
- seq_printf(s, "CPU ");
+ seq_printf(s, "CPU");
if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
- seq_printf(s, "TASK/PID ");
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)
- seq_printf(s, "OVERHEAD/");
- seq_printf(s, "DURATION FUNCTION CALLS\n");
+ seq_printf(s, " TASK/PID ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+ seq_printf(s, " DURATION ");
+ seq_printf(s, " FUNCTION CALLS\n");
/* 2nd line */
seq_printf(s, "# ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+ seq_printf(s, " | ");
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
- seq_printf(s, "| ");
+ seq_printf(s, "| ");
if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
- seq_printf(s, "| | ");
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- seq_printf(s, "| ");
- seq_printf(s, "| | | | |\n");
- } else
- seq_printf(s, " | | | | |\n");
+ seq_printf(s, " | | ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+ seq_printf(s, " | | ");
+ seq_printf(s, " | | | |\n");
+}
+
+static void graph_trace_open(struct trace_iterator *iter)
+{
+ /* pid and depth on the last trace processed */
+ struct fgraph_data *data = alloc_percpu(struct fgraph_data);
+ int cpu;
+
+ if (!data)
+ pr_warning("function graph tracer: not enough memory\n");
+ else
+ for_each_possible_cpu(cpu) {
+ pid_t *pid = &(per_cpu_ptr(data, cpu)->last_pid);
+ int *depth = &(per_cpu_ptr(data, cpu)->depth);
+ *pid = -1;
+ *depth = 0;
+ }
+
+ iter->private = data;
}
+
+static void graph_trace_close(struct trace_iterator *iter)
+{
+ free_percpu(iter->private);
+}
+
static struct tracer graph_trace __read_mostly = {
- .name = "function_graph",
- .init = graph_trace_init,
- .reset = graph_trace_reset,
+ .name = "function_graph",
+ .open = graph_trace_open,
+ .close = graph_trace_close,
+ .wait_pipe = poll_wait_pipe,
+ .init = graph_trace_init,
+ .reset = graph_trace_reset,
.print_line = print_graph_function,
.print_header = print_graph_headers,
.flags = &tracer_flags,
+#ifdef CONFIG_FTRACE_SELFTEST
+ .selftest = trace_selftest_startup_function_graph,
+#endif
};
static __init int init_graph_trace(void)
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