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
..
acpi	Merge branches 'atomicio-apei', 'hotplug', 'sony-nvs-nosave' and 'thermal-netlink' into release	2012-01-23 19:47:06 -05:00
asm-generic	asm-generic: architecture independent readq/writeq for 32bit environment	2012-02-21 16:47:28 -08:00
crypto
drm	drm: Fix authentication kernel crash	2012-01-25 09:27:45 +00:00
keys	keys: add a "logon" key type	2012-01-17 22:39:40 -06:00
linux	sys_poll: fix incorrect type for 'timeout' parameter	2012-02-21 17:24:20 -08:00
math-emu
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-01-18 12:53:54 -08:00
misc
mtd
net	netprio_cgroup: fix wrong memory access when NETPRIO_CGROUP=m	2012-02-10 15:08:57 -05:00
pcmcia
rdma
rxrpc
scsi	[SCSI] libfc: Declare local functions static	2012-01-16 12:45:48 +04:00
sound	Merge branch 'fix/asoc' into for-linus	2012-01-31 15:13:14 +01:00
target	target: Change target_submit_cmd() to return void	2012-02-07 06:41:04 +00:00
trace	sched/events: Revert trace_sched_stat_sleeptime()	2012-02-22 12:06:55 +01:00
video	fbdev fixes for 3.3	2012-02-07 15:54:02 -08:00
xen	Merge branch 'for-3.3/drivers' of git://git.kernel.dk/linux-block	2012-01-15 12:48:41 -08:00
Kbuild