Peter Zijlstra 8c79a045fd sched/events: Revert trace_sched_stat_sleeptime() ... Commit 1ac9bc69 ("sched/tracing: Add a new tracepoint for sleeptime") added a new sched:sched_stat_sleeptime tracepoint. It's broken: the first sample we get on a task might be bad because of a stale sleep_start value that wasn't reset at the last task switch because the tracepoint was not active. It also breaks the existing schedstat samples due to the side effects of: - se->statistics.sleep_start = 0; ... - se->statistics.block_start = 0; Nor do I see means to fix it without adding overhead to the scheduler fast path, which I'm not willing to for the sake of redundant instrumentation. Most importantly, sleep time information can already be constructed by tracing context switches and wakeups, and taking the timestamp difference between the schedule-out, the wakeup and the schedule-in. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andrew Vagin <avagin@openvz.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-pc4c9qhl8q6vg3bs4j6k0rbd@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>		2012-02-22 12:06:55 +01:00
..
9p.h	net/9p: Convert net/9p protocol dumps to tracepoints	2011-10-24 11:13:12 -05:00
asoc.h	ASoC: Add another DAPM stat for neighbour checks	2011-09-22 17:24:40 +01:00
block.h	blktrace: add FLUSH/FUA support	2011-08-11 10:36:05 +02:00
btrfs.h	Btrfs: space leak tracepoints	2012-01-16 15:29:43 -05:00
compaction.h
ext3.h
ext4.h	ext4: do not reference pa_inode from group_pa	2011-12-18 15:49:54 -05:00
gfpflags.h
gpio.h
irq.h
jbd2.h
jbd.h
kmem.h	mm-tracepoint: rename page-free events	2012-01-10 16:30:41 -08:00
kvm.h
lock.h
mce.h
module.h	include: replace linux/module.h with "struct module" wherever possible	2011-10-31 19:32:32 -04:00
napi.h
net.h
oom.h	tracepoint: add tracepoints for debugging oom_score_adj	2012-01-10 16:30:44 -08:00
power.h
rcu.h	rcu: Augment rcu_batch_end tracing for idle and callback state	2011-12-11 10:32:22 -08:00
regmap.h	regmap: Add trace event for successful cache reads	2011-11-30 20:51:09 +00:00
regulator.h
rpm.h	PM / Runtime: Introduce trace points for tracing rpm_* functions	2011-09-27 22:53:27 +02:00
sched.h	sched/events: Revert trace_sched_stat_sleeptime()	2012-02-22 12:06:55 +01:00
scsi.h
signal.h
skb.h
sock.h
syscalls.h
task.h	tracepoint: add tracepoints for debugging oom_score_adj	2012-01-10 16:30:44 -08:00
timer.h
udp.h
vmscan.h	vmscan/trace: Add 'file' info to trace_mm_vmscan_lru_isolate()	2012-01-12 20:13:08 -08:00
workqueue.h
writeback.h	writeback: fix dereferencing NULL bdi->dev on trace_writeback_queue	2012-02-06 11:17:25 +08:00
xen.h	xen/tracing: fix compile errors when tracing is disabled.	2011-07-25 15:51:02 -07:00