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authorZhaolei <zhaolei@cn.fujitsu.com>2009-03-31 15:24:51 +0800
committerIngo Molnar <mingo@elte.hu>2009-04-07 14:01:11 +0200
commit8bcae09b93e7f96f700b6bb372c2b3f2b36636dc (patch)
tree035ba58e3d2faaf639da6225b52c6d8428ac9307 /kernel/trace
parent5ac9f62267dc92c7735c642a5942d9e6c1190308 (diff)
downloadop-kernel-dev-8bcae09b93e7f96f700b6bb372c2b3f2b36636dc.zip
op-kernel-dev-8bcae09b93e7f96f700b6bb372c2b3f2b36636dc.tar.gz
ftrace: Add check of sched_stopped for probe_sched_wakeup
The wakeup tracing in sched_switch does not stop when a user disables tracing. This is because the probe_sched_wakeup() is missing the check to prevent the wakeup from being traced. Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> LKML-Reference: <49D1C543.3010307@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_sched_switch.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index de35f20..9117cea 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -62,6 +62,9 @@ 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];
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