Mel, does the patch below fix this bug for you? (Note: you will need to
enable CONFIG_SCHEDSTATS=y too.)
if yes, then Linus please pull this single fix from:
git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git
| Ingo Molnar (1):
| sched: fix profile=sleep
|
| sched_fair.c | 10 ++++++++++
| 1 file changed, 10 insertions(+)
risk is low: the new code only runs with CONFIG_SCHEDSTATS=y
(default:off) and profile=sleep (default:off), so it ought to be fairly
safe to add at this point. (and we had very similar code in v2.6.22
anyway)
Ingo
------------------------->
Subject: sched: fix profile=sleep
From: Ingo Molnar <mingo@elte.hu>
fix sleep profiling - we lost this chunk in the CFS merge.
Found-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/sched_fair.c | 10 ++++++++++
1 file changed, 10 insertions(+)
Index: linux/kernel/sched_fair.c
===================================================================
--- linux.orig/kernel/sched_fair.c
+++ linux/kernel/sched_fair.c
@@ -639,6 +639,16 @@ static void enqueue_sleeper(struct cfs_r
se->block_start = 0;
se->sum_sleep_runtime += delta;
+
+ /*
+ * Blocking time is in units of nanosecs, so shift by 20 to
+ * get a milliseconds-range estimation of the amount of
+ * time that the task spent sleeping:
+ */
+ if (unlikely(prof_on == SLEEP_PROFILING)) {
+ profile_hits(SLEEP_PROFILING, (void *)get_wchan(tsk),
+ delta >> 20);
+ }
}
#endif
}
-
