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Diffstat (limited to 'kernel/trace/trace_sched_switch.c')
-rw-r--r--kernel/trace/trace_sched_switch.c27
1 files changed, 13 insertions, 14 deletions
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index df175cb4564..9117cea6f1a 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -18,6 +18,7 @@ static struct trace_array *ctx_trace;
static int __read_mostly tracer_enabled;
static int sched_ref;
static DEFINE_MUTEX(sched_register_mutex);
+static int sched_stopped;
static void
probe_sched_switch(struct rq *__rq, struct task_struct *prev,
@@ -28,7 +29,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
int cpu;
int pc;
- if (!sched_ref)
+ if (!sched_ref || sched_stopped)
return;
tracing_record_cmdline(prev);
@@ -43,7 +44,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
data = ctx_trace->data[cpu];
if (likely(!atomic_read(&data->disabled)))
- tracing_sched_switch_trace(ctx_trace, data, prev, next, flags, pc);
+ tracing_sched_switch_trace(ctx_trace, prev, next, flags, pc);
local_irq_restore(flags);
}
@@ -61,12 +62,15 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
pc = preempt_count();
tracing_record_cmdline(current);
+ if (sched_stopped)
+ return;
+
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = ctx_trace->data[cpu];
if (likely(!atomic_read(&data->disabled)))
- tracing_sched_wakeup_trace(ctx_trace, data, wakee, current,
+ tracing_sched_wakeup_trace(ctx_trace, wakee, current,
flags, pc);
local_irq_restore(flags);
@@ -93,7 +97,7 @@ static int tracing_sched_register(void)
ret = register_trace_sched_switch(probe_sched_switch);
if (ret) {
pr_info("sched trace: Couldn't activate tracepoint"
- " probe to kernel_sched_schedule\n");
+ " probe to kernel_sched_switch\n");
goto fail_deprobe_wake_new;
}
@@ -185,12 +189,6 @@ void tracing_sched_switch_assign_trace(struct trace_array *tr)
ctx_trace = tr;
}
-static void start_sched_trace(struct trace_array *tr)
-{
- tracing_reset_online_cpus(tr);
- tracing_start_sched_switch_record();
-}
-
static void stop_sched_trace(struct trace_array *tr)
{
tracing_stop_sched_switch_record();
@@ -199,7 +197,8 @@ static void stop_sched_trace(struct trace_array *tr)
static int sched_switch_trace_init(struct trace_array *tr)
{
ctx_trace = tr;
- start_sched_trace(tr);
+ tracing_reset_online_cpus(tr);
+ tracing_start_sched_switch_record();
return 0;
}
@@ -211,13 +210,12 @@ static void sched_switch_trace_reset(struct trace_array *tr)
static void sched_switch_trace_start(struct trace_array *tr)
{
- tracing_reset_online_cpus(tr);
- tracing_start_sched_switch();
+ sched_stopped = 0;
}
static void sched_switch_trace_stop(struct trace_array *tr)
{
- tracing_stop_sched_switch();
+ sched_stopped = 1;
}
static struct tracer sched_switch_trace __read_mostly =
@@ -227,6 +225,7 @@ static struct tracer sched_switch_trace __read_mostly =
.reset = sched_switch_trace_reset,
.start = sched_switch_trace_start,
.stop = sched_switch_trace_stop,
+ .wait_pipe = poll_wait_pipe,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_sched_switch,
#endif