From: Oleg Nesterov <oleg@redhat.com>
To: anfei <anfei.zhou@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
rientjes@google.com, kosaki.motohiro@jp.fujitsu.com,
nishimura@mxp.nes.nec.co.jp, kamezawa.hiroyu@jp.fujitsu.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] oom killer: break from infinite loop
Date: Mon, 29 Mar 2010 13:46:30 +0200 [thread overview]
Message-ID: <20100329114630.GA19277@redhat.com> (raw)
In-Reply-To: <20100329113113.GA11838@desktop>
On 03/29, anfei wrote:
>
> On Sun, Mar 28, 2010 at 06:28:21PM +0200, Oleg Nesterov wrote:
> > On 03/28, anfei wrote:
> > >
> > > Assume thread A and B are in the same group. If A runs into the oom,
> > > and selects B as the victim, B won't exit because at least in exit_mm(),
> > > it can not get the mm->mmap_sem semaphore which A has already got.
> >
> > I see. But still I can't understand. To me, the problem is not that
> > B can't exit, the problem is that A doesn't know it should exit. All
>
> If B can exit, its memory will be freed,
Which memory? I thought, we are talking about the memory used by ->mm ?
Oleg.
WARNING: multiple messages have this Message-ID (diff)
From: Oleg Nesterov <oleg@redhat.com>
To: anfei <anfei.zhou@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
rientjes@google.com, kosaki.motohiro@jp.fujitsu.com,
nishimura@mxp.nes.nec.co.jp, kamezawa.hiroyu@jp.fujitsu.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] oom killer: break from infinite loop
Date: Mon, 29 Mar 2010 13:46:30 +0200 [thread overview]
Message-ID: <20100329114630.GA19277@redhat.com> (raw)
In-Reply-To: <20100329113113.GA11838@desktop>
On 03/29, anfei wrote:
>
> On Sun, Mar 28, 2010 at 06:28:21PM +0200, Oleg Nesterov wrote:
> > On 03/28, anfei wrote:
> > >
> > > Assume thread A and B are in the same group. If A runs into the oom,
> > > and selects B as the victim, B won't exit because at least in exit_mm(),
> > > it can not get the mm->mmap_sem semaphore which A has already got.
> >
> > I see. But still I can't understand. To me, the problem is not that
> > B can't exit, the problem is that A doesn't know it should exit. All
>
> If B can exit, its memory will be freed,
Which memory? I thought, we are talking about the memory used by ->mm ?
Oleg.
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next prev parent reply other threads:[~2010-03-29 11:48 UTC|newest]
Thread overview: 197+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-24 16:25 [PATCH] oom killer: break from infinite loop Anfei Zhou
2010-03-24 16:25 ` Anfei Zhou
2010-03-25 2:51 ` KOSAKI Motohiro
2010-03-25 2:51 ` KOSAKI Motohiro
2010-03-26 22:08 ` Andrew Morton
2010-03-26 22:08 ` Andrew Morton
2010-03-26 22:33 ` Oleg Nesterov
2010-03-26 22:33 ` Oleg Nesterov
2010-03-28 14:55 ` anfei
2010-03-28 14:55 ` anfei
2010-03-28 16:28 ` Oleg Nesterov
2010-03-28 16:28 ` Oleg Nesterov
2010-03-28 21:21 ` David Rientjes
2010-03-28 21:21 ` David Rientjes
2010-03-29 11:21 ` Oleg Nesterov
2010-03-29 11:21 ` Oleg Nesterov
2010-03-29 20:49 ` [patch] oom: give current access to memory reserves if it has been killed David Rientjes
2010-03-29 20:49 ` David Rientjes
2010-03-30 15:46 ` Oleg Nesterov
2010-03-30 15:46 ` Oleg Nesterov
2010-03-30 20:26 ` David Rientjes
2010-03-30 20:26 ` David Rientjes
2010-03-31 17:58 ` Oleg Nesterov
2010-03-31 17:58 ` Oleg Nesterov
2010-03-31 20:47 ` Oleg Nesterov
2010-03-31 20:47 ` Oleg Nesterov
2010-04-01 8:35 ` David Rientjes
2010-04-01 8:35 ` David Rientjes
2010-04-01 8:57 ` [patch -mm] oom: hold tasklist_lock when dumping tasks David Rientjes
2010-04-01 14:27 ` Oleg Nesterov
2010-04-01 19:16 ` David Rientjes
2010-04-01 13:59 ` [patch] oom: give current access to memory reserves if it has been killed Oleg Nesterov
2010-04-01 14:00 ` Oleg Nesterov
2010-04-01 19:12 ` David Rientjes
2010-04-01 19:12 ` David Rientjes
2010-04-02 11:14 ` Oleg Nesterov
2010-04-02 11:14 ` Oleg Nesterov
2010-04-02 18:30 ` [PATCH -mm 0/4] oom: linux has threads Oleg Nesterov
2010-04-02 18:30 ` Oleg Nesterov
2010-04-02 18:31 ` [PATCH -mm 1/4] oom: select_bad_process: check PF_KTHREAD instead of !mm to skip kthreads Oleg Nesterov
2010-04-02 18:31 ` Oleg Nesterov
2010-04-02 19:05 ` David Rientjes
2010-04-02 19:05 ` David Rientjes
2010-04-02 18:32 ` [PATCH -mm 2/4] oom: select_bad_process: PF_EXITING check should take ->mm into account Oleg Nesterov
2010-04-02 18:32 ` Oleg Nesterov
2010-04-06 11:42 ` anfei
2010-04-06 11:42 ` anfei
2010-04-06 12:18 ` Oleg Nesterov
2010-04-06 12:18 ` Oleg Nesterov
2010-04-06 13:05 ` anfei
2010-04-06 13:05 ` anfei
2010-04-06 13:38 ` Oleg Nesterov
2010-04-06 13:38 ` Oleg Nesterov
2010-04-02 18:32 ` [PATCH -mm 3/4] oom: introduce find_lock_task_mm() to fix !mm false positives Oleg Nesterov
2010-04-02 18:32 ` Oleg Nesterov
2010-04-02 18:33 ` [PATCH -mm 4/4] oom: oom_forkbomb_penalty: move thread_group_cputime() out of task_lock() Oleg Nesterov
2010-04-02 18:33 ` Oleg Nesterov
2010-04-02 19:04 ` David Rientjes
2010-04-02 19:04 ` David Rientjes
2010-04-05 14:23 ` [PATCH -mm] oom: select_bad_process: never choose tasks with badness == 0 Oleg Nesterov
2010-04-05 14:23 ` Oleg Nesterov
2010-04-02 19:02 ` [patch] oom: give current access to memory reserves if it has been killed David Rientjes
2010-04-02 19:02 ` David Rientjes
2010-04-02 19:14 ` Oleg Nesterov
2010-04-02 19:14 ` Oleg Nesterov
2010-04-02 19:46 ` David Rientjes
2010-04-02 19:46 ` David Rientjes
2010-04-02 19:54 ` [patch -mm] oom: exclude tasks with badness score of 0 from being selected David Rientjes
2010-04-02 19:54 ` David Rientjes
2010-04-02 21:04 ` Oleg Nesterov
2010-04-02 21:04 ` Oleg Nesterov
2010-04-02 21:22 ` [patch -mm v2] " David Rientjes
2010-04-02 21:22 ` David Rientjes
2010-04-02 20:55 ` [patch] oom: give current access to memory reserves if it has been killed Oleg Nesterov
2010-04-02 20:55 ` Oleg Nesterov
2010-03-31 21:07 ` David Rientjes
2010-03-31 21:07 ` David Rientjes
2010-03-31 22:50 ` Oleg Nesterov
2010-03-31 22:50 ` Oleg Nesterov
2010-03-31 23:30 ` Oleg Nesterov
2010-03-31 23:30 ` Oleg Nesterov
2010-03-31 23:48 ` David Rientjes
2010-03-31 23:48 ` David Rientjes
2010-04-01 14:39 ` Oleg Nesterov
2010-04-01 14:39 ` Oleg Nesterov
2010-04-01 18:58 ` David Rientjes
2010-04-01 18:58 ` David Rientjes
2010-04-01 8:25 ` David Rientjes
2010-04-01 8:25 ` David Rientjes
2010-04-01 15:26 ` Oleg Nesterov
2010-04-01 15:26 ` Oleg Nesterov
2010-04-08 21:08 ` David Rientjes
2010-04-08 21:08 ` David Rientjes
2010-04-09 12:38 ` Oleg Nesterov
2010-04-09 12:38 ` Oleg Nesterov
2010-03-30 16:39 ` [PATCH] oom: fix the unsafe proc_oom_score()->badness() call Oleg Nesterov
2010-03-30 16:39 ` Oleg Nesterov
2010-03-30 17:43 ` [PATCH -mm] proc: don't take ->siglock for /proc/pid/oom_adj Oleg Nesterov
2010-03-30 17:43 ` Oleg Nesterov
2010-03-30 20:30 ` David Rientjes
2010-03-30 20:30 ` David Rientjes
2010-03-31 9:17 ` Oleg Nesterov
2010-03-31 9:17 ` Oleg Nesterov
2010-03-31 18:59 ` Oleg Nesterov
2010-03-31 18:59 ` Oleg Nesterov
2010-03-31 21:14 ` David Rientjes
2010-03-31 21:14 ` David Rientjes
2010-03-31 23:00 ` Oleg Nesterov
2010-03-31 23:00 ` Oleg Nesterov
2010-04-01 8:32 ` David Rientjes
2010-04-01 8:32 ` David Rientjes
2010-04-01 15:37 ` Oleg Nesterov
2010-04-01 15:37 ` Oleg Nesterov
2010-04-01 19:04 ` David Rientjes
2010-04-01 19:04 ` David Rientjes
2010-03-30 20:32 ` [PATCH] oom: fix the unsafe proc_oom_score()->badness() call David Rientjes
2010-03-30 20:32 ` David Rientjes
2010-03-31 9:16 ` Oleg Nesterov
2010-03-31 9:16 ` Oleg Nesterov
2010-03-31 20:17 ` Oleg Nesterov
2010-03-31 20:17 ` Oleg Nesterov
2010-04-01 7:41 ` David Rientjes
2010-04-01 7:41 ` David Rientjes
2010-04-01 13:13 ` [PATCH 0/1] oom: fix the unsafe usage of badness() in proc_oom_score() Oleg Nesterov
2010-04-01 13:13 ` Oleg Nesterov
2010-04-01 13:13 ` [PATCH 1/1] " Oleg Nesterov
2010-04-01 13:13 ` Oleg Nesterov
2010-04-01 19:03 ` David Rientjes
2010-04-01 19:03 ` David Rientjes
2010-03-29 14:06 ` [PATCH] oom killer: break from infinite loop anfei
2010-03-29 14:06 ` anfei
2010-03-29 20:01 ` David Rientjes
2010-03-29 20:01 ` David Rientjes
2010-03-30 14:29 ` anfei
2010-03-30 14:29 ` anfei
2010-03-30 20:29 ` David Rientjes
2010-03-30 20:29 ` David Rientjes
2010-03-31 0:57 ` KAMEZAWA Hiroyuki
2010-03-31 0:57 ` KAMEZAWA Hiroyuki
2010-03-31 6:07 ` David Rientjes
2010-03-31 6:07 ` David Rientjes
2010-03-31 6:13 ` KAMEZAWA Hiroyuki
2010-03-31 6:13 ` KAMEZAWA Hiroyuki
2010-03-31 6:30 ` Balbir Singh
2010-03-31 6:30 ` Balbir Singh
2010-03-31 6:31 ` KAMEZAWA Hiroyuki
2010-03-31 6:31 ` KAMEZAWA Hiroyuki
2010-03-31 7:04 ` David Rientjes
2010-03-31 7:04 ` David Rientjes
2010-03-31 6:32 ` David Rientjes
2010-03-31 6:32 ` David Rientjes
2010-03-31 7:08 ` [patch -mm] memcg: make oom killer a no-op when no killable task can be found David Rientjes
2010-03-31 7:08 ` KAMEZAWA Hiroyuki
2010-03-31 8:04 ` Balbir Singh
2010-03-31 10:38 ` David Rientjes
2010-04-04 23:28 ` David Rientjes
2010-04-05 21:30 ` Andrew Morton
2010-04-05 22:40 ` David Rientjes
2010-04-05 22:49 ` Andrew Morton
2010-04-05 23:01 ` David Rientjes
2010-04-06 12:08 ` KOSAKI Motohiro
2010-04-06 21:47 ` David Rientjes
2010-04-07 0:20 ` KAMEZAWA Hiroyuki
2010-04-07 13:29 ` KOSAKI Motohiro
2010-04-08 18:05 ` David Rientjes
2010-04-21 19:17 ` Andrew Morton
2010-04-21 22:04 ` David Rientjes
2010-04-22 0:23 ` KAMEZAWA Hiroyuki
2010-04-22 8:34 ` David Rientjes
2010-04-27 22:58 ` [patch -mm] oom: reintroduce and deprecate oom_kill_allocating_task David Rientjes
2010-04-28 0:57 ` KAMEZAWA Hiroyuki
2010-04-22 7:23 ` [patch -mm] memcg: make oom killer a no-op when no killable task can be found Nick Piggin
2010-04-22 7:25 ` KAMEZAWA Hiroyuki
2010-04-22 10:09 ` Nick Piggin
2010-04-22 10:27 ` KAMEZAWA Hiroyuki
2010-04-22 21:11 ` David Rientjes
2010-04-22 10:28 ` David Rientjes
2010-04-22 15:39 ` Nick Piggin
2010-04-22 21:09 ` David Rientjes
2010-05-04 23:55 ` David Rientjes
2010-04-08 17:36 ` David Rientjes
2010-04-02 10:17 ` [PATCH] oom killer: break from infinite loop Mel Gorman
2010-04-02 10:17 ` Mel Gorman
2010-04-04 23:26 ` David Rientjes
2010-04-04 23:26 ` David Rientjes
2010-04-05 10:47 ` Mel Gorman
2010-04-05 10:47 ` Mel Gorman
2010-04-06 22:40 ` David Rientjes
2010-04-06 22:40 ` David Rientjes
2010-03-29 11:31 ` anfei
2010-03-29 11:31 ` anfei
2010-03-29 11:46 ` Oleg Nesterov [this message]
2010-03-29 11:46 ` Oleg Nesterov
2010-03-29 12:09 ` anfei
2010-03-29 12:09 ` anfei
2010-03-28 2:46 ` David Rientjes
2010-03-28 2:46 ` David Rientjes
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