From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: kosaki.motohiro@jp.fujitsu.com,
Andrew Morton <akpm@linux-foundation.org>,
Neil Brown <neilb@suse.de>, Wu Fengguang <fengguang.wu@intel.com>,
Rik van Riel <riel@redhat.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"Li, Shaohua" <shaohua.li@intel.com>
Subject: Re: Deadlock possibly caused by too_many_isolated.
Date: Tue, 19 Oct 2010 10:21:32 +0900 (JST) [thread overview]
Message-ID: <20101019102114.A1B9.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <AANLkTin38qJ-U3B7XwMh-3aR9zRs21LgR1yHfqYifxrn@mail.gmail.com>
> On Tue, Oct 19, 2010 at 9:57 AM, KOSAKI Motohiro
> <kosaki.motohiro@jp.fujitsu.com> wrote:
> >> > I think there are two bugs here.
> >> > The raid1 bug that Torsten mentions is certainly real (and has been around
> >> > for an embarrassingly long time).
> >> > The bug that I identified in too_many_isolated is also a real bug and can be
> >> > triggered without md/raid1 in the mix.
> >> > So this is not a 'full fix' for every bug in the kernel :-), but it could
> >> > well be a full fix for this particular bug.
> >> >
> >>
> >> Can we just delete the too_many_isolated() logic? (Crappy comment
> >> describes what the code does but not why it does it).
> >
> > if my remember is correct, we got bug report that LTP may makes misterious
> > OOM killer invocation about 1-2 years ago. because, if too many parocess are in
> > reclaim path, all of reclaimable pages can be isolated and last reclaimer found
> > the system don't have any reclaimable pages and lead to invoke OOM killer.
> > We have strong motivation to avoid false positive oom. then, some discusstion
> > made this patch.
> >
> > if my remember is incorrect, I hope Wu or Rik fix me.
>
> AFAIR, it's right.
>
> How about this?
>
> It's rather aggressive throttling than old(ie, it considers not lru
> type granularity but zone )
> But I think it can prevent unnecessary OOM problem and solve deadlock problem.
Can you please elaborate your intention? Do you think Wu's approach is wrong?
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next prev parent reply other threads:[~2010-10-19 1:21 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-14 23:11 Neil Brown
2010-09-15 0:30 ` Rik van Riel
2010-09-15 2:23 ` Neil Brown
2010-09-15 2:37 ` Wu Fengguang
2010-09-15 2:54 ` Wu Fengguang
2010-09-15 3:06 ` Wu Fengguang
2010-09-15 3:13 ` Wu Fengguang
2010-09-15 3:18 ` Shaohua Li
2010-09-15 3:31 ` Wu Fengguang
2010-09-15 3:17 ` Neil Brown
2010-09-15 3:47 ` Wu Fengguang
2010-09-15 8:28 ` Wu Fengguang
2010-09-15 8:44 ` Neil Brown
2010-10-18 4:14 ` Neil Brown
2010-10-18 5:04 ` KOSAKI Motohiro
2010-10-18 10:58 ` Torsten Kaiser
2010-10-18 23:11 ` Neil Brown
2010-10-19 8:43 ` Torsten Kaiser
2010-10-19 10:06 ` Torsten Kaiser
2010-10-20 5:57 ` Wu Fengguang
2010-10-20 7:05 ` KOSAKI Motohiro
2010-10-20 9:27 ` Wu Fengguang
2010-10-20 13:03 ` Jens Axboe
2010-10-22 5:37 ` Wu Fengguang
2010-10-22 8:07 ` Wu Fengguang
2010-10-22 8:09 ` Jens Axboe
2010-10-24 16:52 ` Wu Fengguang
2010-10-25 6:40 ` Neil Brown
2010-10-25 7:26 ` Wu Fengguang
2010-10-20 7:25 ` Torsten Kaiser
2010-10-20 9:01 ` Wu Fengguang
2010-10-20 10:07 ` Torsten Kaiser
2010-10-20 14:23 ` Minchan Kim
2010-10-20 15:35 ` Torsten Kaiser
2010-10-20 23:31 ` Minchan Kim
2010-10-18 16:15 ` Wu Fengguang
2010-10-18 21:58 ` Andrew Morton
2010-10-18 22:31 ` Neil Brown
2010-10-18 22:41 ` Andrew Morton
2010-10-19 0:57 ` KOSAKI Motohiro
2010-10-19 1:15 ` Minchan Kim
2010-10-19 1:21 ` KOSAKI Motohiro [this message]
2010-10-19 1:32 ` Minchan Kim
2010-10-19 2:03 ` KOSAKI Motohiro
2010-10-19 2:16 ` Minchan Kim
2010-10-19 2:54 ` KOSAKI Motohiro
2010-10-19 2:35 ` Wu Fengguang
2010-10-19 2:52 ` Minchan Kim
2010-10-19 3:05 ` Wu Fengguang
2010-10-19 3:09 ` Minchan Kim
2010-10-19 3:13 ` KOSAKI Motohiro
2010-10-19 5:11 ` Minchan Kim
2010-10-19 3:21 ` Shaohua Li
2010-10-19 7:15 ` Shaohua Li
2010-10-19 7:34 ` Minchan Kim
2010-10-19 2:24 ` Wu Fengguang
2010-10-19 2:37 ` KOSAKI Motohiro
2010-10-19 2:37 ` Minchan Kim
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