mm,oom_reaper: reduce find_lock_task_mm() usage
authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fri, 7 Oct 2016 23:58:45 +0000 (16:58 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 8 Oct 2016 01:46:27 +0000 (18:46 -0700)
commit7ebffa45551fe7db86a2b32bf586f124ef484e6e
tree2c58c3c7ef2d09ad69067b57488e3ef232e2914c
parent6b53491598a4d9694318e6e2b11d8c9988a483d4
mm,oom_reaper: reduce find_lock_task_mm() usage

Patch series "fortify oom killer even more", v2.

This patch (of 9):

__oom_reap_task() can be simplified a bit if it receives a valid mm from
oom_reap_task() which also uses that mm when __oom_reap_task() failed.
We can drop one find_lock_task_mm() call and also make the
__oom_reap_task() code flow easier to follow.  Moreover, this will make
later patch in the series easier to review.  Pinning mm's mm_count for
longer time is not really harmful because this will not pin much memory.

This patch doesn't introduce any functional change.

Link: http://lkml.kernel.org/r/1472119394-11342-2-git-send-email-mhocko@kernel.org
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/oom_kill.c