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ftrace: clean up enable logic for sched_switch 

Unify sched_switch and sched_wakeup's action to following logic:
Do record_cmdline when start_cmdline_record() is called.
Start tracing events when the tracer is started.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
LKML-Reference: <49D1C596.5050203@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Zhaolei 2009-03-31 15:26:14 +08:00 committed by Ingo Molnar
parent 597af81537
commit dcef788eb9
1 changed files with 8 additions and 8 deletions
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16
kernel/trace/trace_sched_switch.c
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@ -29,13 +29,13 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
int cpu;
int pc;
if (!sched_ref || sched_stopped)
if (unlikely(!sched_ref))
return;
tracing_record_cmdline(prev);
tracing_record_cmdline(next);
if (!tracer_enabled)
if (!tracer_enabled || sched_stopped)
return;
pc = preempt_count();
@ -56,15 +56,15 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
unsigned long flags;
int cpu, pc;
if (!likely(tracer_enabled))
if (unlikely(!sched_ref))
return;
tracing_record_cmdline(current);
if (!tracer_enabled || sched_stopped)
return;
pc = preempt_count();
tracing_record_cmdline(current);
if (sched_stopped)
return;
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = ctx_trace->data[cpu];