[for-next][PATCH 1/2] tracing: Robustify wait loop
From: Peter Zijlstra
The pending nested sleep debugging triggered on the potential stale
TASK_INTERRUPTIBLE in this code.
While there, fix the loop such that we won't revert to a while(1)
yield() 'spin' loop if we ever get a spurious wakeup.
And fix the actual issue by properly terminating the 'wait' loop by
setting TASK_RUNNING.
Link:
http://lkml.kernel.org/p/20141008165110.ga14...@worktop.programming.kicks-ass.net
Reported-by: Fengguang Wu
Signed-off-by: Peter Zijlstra (Intel)
Signed-off-by: Steven Rostedt
---
kernel/trace/trace_events.c | 5 -
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index ef06ce7e9cf8..0cc51edde3a8 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2513,8 +2513,11 @@ static __init int event_test_thread(void *unused)
kfree(test_malloc);
set_current_state(TASK_INTERRUPTIBLE);
- while (!kthread_should_stop())
+ while (!kthread_should_stop()) {
schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
+ }
+ __set_current_state(TASK_RUNNING);
return 0;
}
--
2.0.1
--
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[for-next][PATCH 1/2] tracing: Robustify wait loop
From: Peter Zijlstra pet...@infradead.org
The pending nested sleep debugging triggered on the potential stale
TASK_INTERRUPTIBLE in this code.
While there, fix the loop such that we won't revert to a while(1)
yield() 'spin' loop if we ever get a spurious wakeup.
And fix the actual issue by properly terminating the 'wait' loop by
setting TASK_RUNNING.
Link:
http://lkml.kernel.org/p/20141008165110.ga14...@worktop.programming.kicks-ass.net
Reported-by: Fengguang Wu fengguang...@intel.com
Signed-off-by: Peter Zijlstra (Intel) pet...@infradead.org
Signed-off-by: Steven Rostedt rost...@goodmis.org
---
kernel/trace/trace_events.c | 5 -
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index ef06ce7e9cf8..0cc51edde3a8 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2513,8 +2513,11 @@ static __init int event_test_thread(void *unused)
kfree(test_malloc);
set_current_state(TASK_INTERRUPTIBLE);
- while (!kthread_should_stop())
+ while (!kthread_should_stop()) {
schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
+ }
+ __set_current_state(TASK_RUNNING);
return 0;
}
--
2.0.1
--
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the body of a message to majord...@vger.kernel.org
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