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ANDROID: trace: sched: add sched blocked tracepoint which dumps out context of sleep.

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Declare war on uninterruptible sleep. Add a tracepoint which
walks the kernel stack and dumps the first non-scheduler function
called before the scheduler is invoked.

Bug: 120445457
Change-Id: I19e965d5206329360a92cbfe2afcc8c30f65c229
Signed-off-by: Riley Andrews <riandrews@google.com>
[astrachan: deleted an unnecessary whitespace change]
Signed-off-by: Alistair Strachan <astrachan@google.com>
Bug: 170916884
Signed-off-by: Todd Kjos <tkjos@google.com>
This commit is contained in:
Riley Andrews 2015-10-02 00:39:53 -07:00 • committed by Todd Kjos
commit 8540985fd2
2 changed files with 25 additions and 0 deletions
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1
kernel/sched/fair.c
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@ -973,6 +973,7 @@ update_stats_enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
}
trace_sched_stat_blocked(tsk, delta);
trace_sched_blocked_reason(tsk);
/*
* Blocking time is in units of nanosecs, so shift by