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Commit 5ce1b1ed authored by Ingo Molnar's avatar Ingo Molnar
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Merge branches 'tracing/ftrace' and 'tracing/function-graph-tracer' into tracing/core

parents 7e49fcce 9005f3eb
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Showing with 195 additions and 103 deletions
kernel/trace/trace_functions_graph.c
View file @ 5ce1b1ed
/*
*
* 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>
*
......@@ -21,9 +21,11 @@
#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) },
......@@ -31,17 +33,22 @@ 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 };
static int graph_trace_init(struct trace_array *tr)
{
......@@ -154,17 +161,25 @@ 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, pid_t *last_pids_cpu)
{
pid_t prev_pid;
pid_t *last_pid;
int ret;
if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
if (!last_pids_cpu)
return TRACE_TYPE_HANDLED;
last_pid = per_cpu_ptr(last_pids_cpu, cpu);
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:
......@@ -232,6 +247,31 @@ trace_branch_is_leaf(struct trace_iterator *iter,
return true;
}
/* 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 enum print_line_t
print_graph_irq(struct trace_seq *s, unsigned long addr,
enum trace_type type, int cpu, pid_t pid)
......@@ -242,9 +282,6 @@ print_graph_irq(struct trace_seq *s, unsigned long addr,
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);
......@@ -256,21 +293,29 @@ print_graph_irq(struct trace_seq *s, unsigned long addr,
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, " ");
ret = print_graph_overhead(-1, s);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
ret = trace_seq_printf(s, "<========== |\n");
}
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");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
......@@ -289,7 +334,7 @@ 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;
......@@ -322,19 +367,15 @@ 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)
static int print_graph_abs_time(u64 t, struct trace_seq *s)
{
/* Duration exceeded 100 msecs */
if (duration > 100000ULL)
return trace_seq_printf(s, "! ");
unsigned long usecs_rem;
/* Duration exceeded 10 msecs */
if (duration > 10000ULL)
return trace_seq_printf(s, "+ ");
usecs_rem = do_div(t, 1000000000);
usecs_rem /= 1000;
return trace_seq_printf(s, " ");
return trace_seq_printf(s, "%5lu.%06lu | ",
(unsigned long)t, usecs_rem);
}
/* Case of a leaf function on its call entry */
......@@ -357,16 +398,16 @@ print_graph_entry_leaf(struct trace_iterator *iter,
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;
}
/* 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++) {
......@@ -395,25 +436,17 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
struct ftrace_graph_ent *call = &entry->graph_ent;
/* 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;
}
/* Interrupt */
ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
if (ret == TRACE_TYPE_UNHANDLED) {
/* 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, " ");
......@@ -434,14 +467,29 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
static enum print_line_t
print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
struct trace_iterator *iter, int cpu)
struct trace_iterator *iter)
{
int ret;
int cpu = iter->cpu;
pid_t *last_entry = iter->private;
struct trace_entry *ent = iter->ent;
struct ftrace_graph_ent *call = &field->graph_ent;
/* Pid */
if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
if (verif_pid(s, ent->pid, cpu, last_entry) == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
/* Interrupt */
ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, 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) {
......@@ -470,16 +518,25 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
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;
int cpu = iter->cpu;
pid_t *last_pid = iter->private;
unsigned long long duration = trace->rettime - trace->calltime;
/* Pid */
if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
if (verif_pid(s, ent->pid, cpu, last_pid) == 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);
......@@ -499,16 +556,16 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
}
/* Overhead */
if (tracer_flags.val & TRACE_GRAPH_PRINT_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;
}
/* Closing brace */
for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
......@@ -542,14 +599,23 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
{
int i;
int ret;
int cpu = iter->cpu;
pid_t *last_pid = iter->private;
/* 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;
}
/* Pid */
if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
if (verif_pid(s, ent->pid, cpu, last_pid) == 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);
ret = print_graph_cpu(s, cpu);
if (ret == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
}
......@@ -566,16 +632,16 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
}
/* 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;
}
/* Indentation */
if (trace->depth > 0)
......@@ -614,13 +680,12 @@ print_graph_function(struct trace_iterator *iter)
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);
return print_graph_return(&field->ret, s, entry, iter);
}
case TRACE_PRINT: {
struct print_entry *field;
......@@ -636,28 +701,55 @@ 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, "| ");
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 on the last trace processed */
pid_t *last_pid = alloc_percpu(pid_t);
int cpu;
if (!last_pid)
pr_warning("function graph tracer: not enough memory\n");
else
for_each_possible_cpu(cpu) {
pid_t *pid = per_cpu_ptr(last_pid, cpu);
*pid = -1;
}
iter->private = last_pid;
}
static void graph_trace_close(struct trace_iterator *iter)
{
percpu_free(iter->private);
}
static struct tracer graph_trace __read_mostly = {
.name = "function_graph",
.open = graph_trace_open,
.close = graph_trace_close,
.init = graph_trace_init,
.reset = graph_trace_reset,
.print_line = print_graph_function,
......
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