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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2008-10-31 13:28:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-04 17:14:07 +0100 |
| commit | efade6e7821c4219818e9da08f9315dfa617048b (patch) | |
| tree | 822e2cc2491d38f082d05a015758263f9bb194b3 /kernel/trace/trace_sched_switch.c | |
| parent | tracing/fastboot: use sched switch tracer from boot tracer (diff) | |
| download | linux-efade6e7821c4219818e9da08f9315dfa617048b.tar.xz linux-efade6e7821c4219818e9da08f9315dfa617048b.zip | |
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: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_sched_switch.c')
| -rw-r--r-- | kernel/trace/trace_sched_switch.c | 30 |
1 files changed, 13 insertions, 17 deletions
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c index 9d7bdac331dd..969953bf678f 100644 --- a/kernel/trace/trace_sched_switch.c +++ b/kernel/trace/trace_sched_switch.c @@ -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) |