From: David Rientjes Date: Wed, 21 Mar 2012 23:33:47 +0000 (-0700) Subject: mm, oom: do not emit oom killer warning if chosen thread is already exiting X-Git-Tag: upstream/snapshot3+hdmi~7935^2~80 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8447d950e7445cae71ad66d0e33784f8388aaf9d;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git mm, oom: do not emit oom killer warning if chosen thread is already exiting If a thread is chosen for oom kill and is already PF_EXITING, then the oom killer simply sets TIF_MEMDIE and returns. This allows the thread to have access to memory reserves so that it may quickly exit. This logic is preceeded with a comment saying there's no need to alarm the sysadmin. This patch adds truth to that statement. There's no need to emit any warning about the oom condition if the thread is already exiting since it will not be killed. In this condition, just silently return the oom killer since its only giving access to memory reserves and is otherwise a no-op. Acked-by: KOSAKI Motohiro Acked-by: KAMEZAWA Hiroyuki Signed-off-by: David Rientjes Acked-by: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/oom_kill.c b/mm/oom_kill.c index d402b2c..8561060 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -445,9 +445,6 @@ static void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, struct mm_struct *mm; unsigned int victim_points = 0; - if (printk_ratelimit()) - dump_header(p, gfp_mask, order, memcg, nodemask); - /* * If the task is already exiting, don't alarm the sysadmin or kill * its children or threads, just set TIF_MEMDIE so it can die quickly @@ -457,6 +454,9 @@ static void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, return; } + if (printk_ratelimit()) + dump_header(p, gfp_mask, order, memcg, nodemask); + task_lock(p); pr_err("%s: Kill process %d (%s) score %d or sacrifice child\n", message, task_pid_nr(p), p->comm, points);