KAMEZAWA Hiroyuki 43d2b11324 tracepoint: add tracepoints for debugging oom_score_adj ... oom_score_adj is used for guarding processes from OOM-Killer. One of problem is that it's inherited at fork(). When a daemon set oom_score_adj and make children, it's hard to know where the value is set. This patch adds some tracepoints useful for debugging. This patch adds 3 trace points. - creating new task - renaming a task (exec) - set oom_score_adj To debug, users need to enable some trace pointer. Maybe filtering is useful as # EVENT=/sys/kernel/debug/tracing/events/task/ # echo "oom_score_adj != 0" > $EVENT/task_newtask/filter # echo "oom_score_adj != 0" > $EVENT/task_rename/filter # echo 1 > $EVENT/enable # EVENT=/sys/kernel/debug/tracing/events/oom/ # echo 1 > $EVENT/enable output will be like this. # grep oom /sys/kernel/debug/tracing/trace bash-7699 [007] d..3 5140.744510: oom_score_adj_update: pid=7699 comm=bash oom_score_adj=-1000 bash-7699 [007] ...1 5151.818022: task_newtask: pid=7729 comm=bash clone_flags=1200011 oom_score_adj=-1000 ls-7729 [003] ...2 5151.818504: task_rename: pid=7729 oldcomm=bash newcomm=ls oom_score_adj=-1000 bash-7699 [002] ...1 5175.701468: task_newtask: pid=7730 comm=bash clone_flags=1200011 oom_score_adj=-1000 grep-7730 [007] ...2 5175.701993: task_rename: pid=7730 oldcomm=bash newcomm=grep oom_score_adj=-1000 Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-01-10 16:30:44 -08:00
..
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	writeback: remove .nonblocking and .encountered_congestion	2011-06-08 08:25:23 +08:00
compaction.h	mm: compaction: add trace events for memory compaction activity	2011-01-13 17:32:33 -08:00
ext3.h	ext3: Add fixed tracepoints	2011-06-25 17:29:51 +02:00
ext4.h	ext4: optimize ext4_ext_convert_to_initialized()	2011-10-27 11:43:23 -04:00
gfpflags.h	mm: tracing: add missing GFP flags to tracing	2011-05-11 18:50:45 -07:00
gpio.h	gpio: add trace events for setting direction and value	2011-05-20 00:40:19 -06:00
irq.h	rcu: Use softirq to address performance regression	2011-06-14 15:25:39 -07:00
jbd.h	jbd: Add fixed tracepoints	2011-06-25 17:29:51 +02:00
jbd2.h	jbd2: remove jbd2_dev_to_name() from jbd2 tracepoints	2011-07-10 22:05:08 -04:00
kmem.h	mm-tracepoint: rename page-free events	2012-01-10 16:30:41 -08:00
kvm.h
lock.h
mce.h	tracing: Fix event alignment: mce:mce_record	2011-03-10 10:34:28 -05:00
module.h	include: replace linux/module.h with "struct module" wherever possible	2011-10-31 19:32:32 -04:00
napi.h
net.h	net: tracepoint of net_dev_xmit sees freed skb and causes panic	2011-06-02 14:06:31 -07:00
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/tracing: Add a new tracepoint for sleeptime	2011-12-23 17:56:17 +01:00
scsi.h	[SCSI] Include protection operation in SCSI command trace	2011-03-14 18:36:02 -05:00
signal.h
skb.h	tracing: Fix event alignment: skb:kfree_skb	2011-03-10 10:34:31 -05:00
sock.h	core: add tracepoints for queueing skb to rcvbuf	2011-06-21 16:06:10 -07:00
syscalls.h
task.h	tracepoint: add tracepoints for debugging oom_score_adj	2012-01-10 16:30:44 -08:00
timer.h
udp.h	udp: add tracepoints for queueing skb to rcvbuf	2011-06-21 16:06:10 -07:00
vmscan.h	mm: change isolate mode from #define to bitwise type	2011-10-31 17:30:44 -07:00
workqueue.h
writeback.h	writeback: show writeback reason with __print_symbolic	2011-12-18 14:20:17 +08:00
xen.h	xen/tracing: fix compile errors when tracing is disabled.	2011-07-25 15:51:02 -07:00