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tracing/fastboot: use sched switch tracer from boot tracer

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Impact: enhance boot trace output with scheduling events

Use the sched_switch tracer from the boot tracer.

We also can trace schedule events inside the initcalls.
Sched tracing is disabled after the initcall has finished and
then reenabled before the next one is started.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2008-10-31 13:20:08 +01:00 • committed by Ingo Molnar
parent e55f605c14
commit d7ad44b697
4 changed files with 12 additions and 3 deletions
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6
kernel/trace/trace_sched_switch.c
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@ -127,6 +127,7 @@ static void tracing_start_sched_switch(void)
long ref;
mutex_lock(&tracepoint_mutex);
tracer_enabled = 1;
ref = atomic_inc_return(&sched_ref);
if (ref == 1)
tracing_sched_register();
@ -138,6 +139,7 @@ static void tracing_stop_sched_switch(void)
long ref;
mutex_lock(&tracepoint_mutex);
tracer_enabled = 0;
ref = atomic_dec_and_test(&sched_ref);
if (ref)
tracing_sched_unregister();
@ -158,12 +160,10 @@ static void start_sched_trace(struct trace_array *tr)
{
sched_switch_reset(tr);
tracing_start_cmdline_record();
tracer_enabled = 1;
}
static void stop_sched_trace(struct trace_array *tr)
{
tracer_enabled = 0;
tracing_stop_cmdline_record();
}
@ -190,7 +190,7 @@ static void sched_switch_trace_ctrl_update(struct trace_array *tr)
stop_sched_trace(tr);
}
static struct tracer sched_switch_trace __read_mostly =
struct tracer sched_switch_trace __read_mostly =
{
.name = "sched_switch",
.init = sched_switch_trace_init,