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tracing: do not update tracing_max_latency when tracer is stopped

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The state of the function pair tracing_stop()/tracing_start() is
correctly considered when tracer data are updated. However, the global
and externally accessible variable tracing_max_latency is always updated
- even when tracing is stopped.

The update should only occur, if tracing was not stopped.

Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Carsten Emde 2009-09-13 01:43:07 +02:00 • committed by Steven Rostedt
parent 41dfba4367
commit b5130b1e7d
4 changed files with 14 additions and 4 deletions
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6
kernel/trace/trace_sched_wakeup.c
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@ -162,8 +162,10 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
if (!report_latency(delta))
goto out_unlock;
tracing_max_latency = delta;
update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu);
if (likely(!is_tracing_stopped())) {
tracing_max_latency = delta;
update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu);
}
out_unlock:
__wakeup_reset(wakeup_trace);