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tracing: have latency tracers set the latency format

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The latency tracers (irqsoff, preemptoff, preemptirqsoff, and wakeup)
are pretty useless with the default output format. This patch makes them
automatically enable the latency format when they are selected. They
also record the state of the latency option, and if it was not enabled
when selected, they disable it on reset.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt
2009-03-04 22:15:30 -05:00
parent 27d48be844
commit e9d25fe6ea
2 changed files with 16 additions and 0 deletions
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kernel/trace/trace_sched_wakeup.c
+8
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@@ -32,6 +32,8 @@ static raw_spinlock_t wakeup_lock =
static void __wakeup_reset(struct trace_array *tr);
static int save_lat_flag;
#ifdef CONFIG_FUNCTION_TRACER
/*
* irqsoff uses its own tracer function to keep the overhead down:
@@ -324,6 +326,9 @@ static void stop_wakeup_tracer(struct trace_array *tr)
static int __wakeup_tracer_init(struct trace_array *tr)
{
save_lat_flag = trace_flags & TRACE_ITER_LATENCY_FMT;
trace_flags |= TRACE_ITER_LATENCY_FMT;
tracing_max_latency = 0;
wakeup_trace = tr;
start_wakeup_tracer(tr);
@@ -347,6 +352,9 @@ static void wakeup_tracer_reset(struct trace_array *tr)
stop_wakeup_tracer(tr);
/* make sure we put back any tasks we are tracing */
wakeup_reset(tr);
if (!save_lat_flag)
trace_flags &= ~TRACE_ITER_LATENCY_FMT;
}
static void wakeup_tracer_start(struct trace_array *tr)