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tracing/ftrace: types and naming corrections for sched tracer

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Impact: cleanup

This patch applies some corrections suggested by Steven Rostedt.

Change the type of shed_ref into int since it is used
into a Mutex, we don't need it anymore as an atomic
variable in the sched_switch tracer.
Also change the name of the register mutex.

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 13:28:58 +01:00 committed by Ingo Molnar
parent d7ad44b697
commit efade6e782
1 changed files with 13 additions and 17 deletions
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30
kernel/trace/trace_sched_switch.c
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@ -16,8 +16,8 @@
static struct trace_array *ctx_trace;
static int __read_mostly tracer_enabled;
static atomic_t sched_ref;
static DEFINE_MUTEX(tracepoint_mutex);
static int sched_ref;
static DEFINE_MUTEX(sched_register_mutex);
static void
probe_sched_switch(struct rq *__rq, struct task_struct *prev,
@ -28,7 +28,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
int cpu;
int pc;
if (!atomic_read(&sched_ref))
if (!sched_ref)
return;
tracing_record_cmdline(prev);
@ -124,26 +124,22 @@ static void tracing_sched_unregister(void)
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)
mutex_lock(&sched_register_mutex);
if (!(sched_ref++)) {
tracer_enabled = 1;
tracing_sched_register();
mutex_unlock(&tracepoint_mutex);
}
mutex_unlock(&sched_register_mutex);
}
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)
mutex_lock(&sched_register_mutex);
if (!(--sched_ref)) {
tracing_sched_unregister();
mutex_unlock(&tracepoint_mutex);
tracer_enabled = 0;
}
mutex_unlock(&sched_register_mutex);
}
void tracing_start_cmdline_record(void)