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Commit efade6e7 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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tracing/ftrace: types and naming corrections for sched tracer 



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: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent d7ad44b6

kernel/trace/trace_sched_switch.c

+13 −17
Original line number Diff line number Diff line
@@ -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);

	mutex_lock(&sched_register_mutex);

	if (!(sched_ref++)) {

		tracer_enabled = 1;

	ref = atomic_inc_return(&sched_ref);

	if (ref == 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)