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authorDavid Rientjes <rientjes@google.com>2014-01-24 03:53:34 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-24 04:36:53 +0400
commitd49ad9355420c743c736bfd1dee9eaa5b1a7722a (patch)
treeedd5f00d2e7e6b2414f7063e3393934dc74e5c9b /mm/oom_kill.c
parentc3ac14b2677e0bc130238c5d01856592ac7a584b (diff)
downloadlinux-d49ad9355420c743c736bfd1dee9eaa5b1a7722a.tar.xz
mm, oom: prefer thread group leaders for display purposes
When two threads have the same badness score, it's preferable to kill the thread group leader so that the actual process name is printed to the kernel log rather than the thread group name which may be shared amongst several processes. This was the behavior when select_bad_process() used to do for_each_process(), but it now iterates threads instead and leads to ambiguity. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 054ff47c4478..37b1b1903fb2 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -327,10 +327,14 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
break;
};
points = oom_badness(p, NULL, nodemask, totalpages);
- if (points > chosen_points) {
- chosen = p;
- chosen_points = points;
- }
+ if (!points || points < chosen_points)
+ continue;
+ /* Prefer thread group leaders for display purposes */
+ if (points == chosen_points && thread_group_leader(chosen))
+ continue;
+
+ chosen = p;
+ chosen_points = points;
}
if (chosen)
get_task_struct(chosen);