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Diffstat (limited to 'kernel/trace/trace_sched_switch.c')
-rw-r--r--kernel/trace/trace_sched_switch.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 5671db0e182..a3376478fc2 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -29,8 +29,6 @@ ctx_switch_func(void *__rq, struct task_struct *prev, struct task_struct *next)
if (!tracer_enabled)
return;
- tracing_record_cmdline(prev);
-
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
@@ -73,6 +71,9 @@ void
ftrace_ctx_switch(void *__rq, struct task_struct *prev,
struct task_struct *next)
{
+ if (unlikely(atomic_read(&trace_record_cmdline_enabled)))
+ tracing_record_cmdline(prev);
+
/*
* If tracer_switch_func only points to the local
* switch func, it still needs the ptr passed to it.
@@ -134,11 +135,13 @@ static void sched_switch_reset(struct trace_array *tr)
static void start_sched_trace(struct trace_array *tr)
{
sched_switch_reset(tr);
+ atomic_inc(&trace_record_cmdline_enabled);
tracer_enabled = 1;
}
static void stop_sched_trace(struct trace_array *tr)
{
+ atomic_dec(&trace_record_cmdline_enabled);
tracer_enabled = 0;
}