oom: /proc/<pid>/oom_score treat kernel thread honestly
authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Tue, 10 Aug 2010 00:19:37 +0000 (17:19 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 10 Aug 2010 03:45:01 +0000 (20:45 -0700)
commit26ebc984913b6a8d86d724b3a79d2ed4ed574612
tree9d293c6f8b1bc5120beaa173590dcd83cd0e2eb0
parentf88ccad5886d5a864b8b0d48c666ee9998dec53f
oom: /proc/<pid>/oom_score treat kernel thread honestly

If a kernel thread is using use_mm(), badness() returns a positive value.
This is not a big issue because caller take care of it correctly.  But
there is one exception, /proc/<pid>/oom_score calls badness() directly and
doesn't care that the task is a regular process.

Another example, /proc/1/oom_score return !0 value.  But it's unkillable.
This incorrectness makes administration a little confusing.

This patch fixes it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/base.c
mm/oom_kill.c