From: Mel Gorman <mgorman@suse.de>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Vlastimil Babka <vbabka@suse.cz>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Rik van Riel <riel@redhat.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH] mm, vmscan: do not loop on too_many_isolated for ever
Date: Thu, 9 Mar 2017 14:31:48 +0000 [thread overview]
Message-ID: <20170309143148.ewpatb26g6lzsx6a@suse.de> (raw)
In-Reply-To: <20170307133057.26182-1-mhocko@kernel.org>
On Tue, Mar 07, 2017 at 02:30:57PM +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
>
> Tetsuo Handa has reported [1][2] that direct reclaimers might get stuck
> in too_many_isolated loop basically for ever because the last few pages
> on the LRU lists are isolated by the kswapd which is stuck on fs locks
> when doing the pageout or slab reclaim. This in turn means that there is
> nobody to actually trigger the oom killer and the system is basically
> unusable.
>
> too_many_isolated has been introduced by 35cd78156c49 ("vmscan: throttle
> direct reclaim when too many pages are isolated already") to prevent
> from pre-mature oom killer invocations because back then no reclaim
> progress could indeed trigger the OOM killer too early. But since the
> oom detection rework 0a0337e0d1d1 ("mm, oom: rework oom detection")
> the allocation/reclaim retry loop considers all the reclaimable pages
> and throttles the allocation at that layer so we can loosen the direct
> reclaim throttling.
>
> Make shrink_inactive_list loop over too_many_isolated bounded and returns
> immediately when the situation hasn't resolved after the first sleep.
> Replace congestion_wait by a simple schedule_timeout_interruptible because
> we are not really waiting on the IO congestion in this path.
>
> Please note that this patch can theoretically cause the OOM killer to
> trigger earlier while there are many pages isolated for the reclaim
> which makes progress only very slowly. This would be obvious from the oom
> report as the number of isolated pages are printed there. If we ever hit
> this should_reclaim_retry should consider those numbers in the evaluation
> in one way or another.
>
> [1] http://lkml.kernel.org/r/201602092349.ACG81273.OSVtMJQHLOFOFF@I-love.SAKURA.ne.jp
> [2] http://lkml.kernel.org/r/201702212335.DJB30777.JOFMHSFtVLQOOF@I-love.SAKURA.ne.jp
>
> Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Mel Gorman <mgorman@suse.de>
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2017-03-09 14:32 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-07 13:30 [PATCH] mm, vmscan: do not loop on too_many_isolated for ever Michal Hocko
2017-03-07 19:52 ` Rik van Riel
2017-03-08 9:21 ` Michal Hocko
2017-03-08 15:54 ` Rik van Riel
2017-03-09 9:12 ` Michal Hocko
2017-03-09 14:16 ` Rik van Riel
2017-03-09 14:59 ` Michal Hocko
2017-03-09 18:05 ` Johannes Weiner
2017-03-09 22:18 ` Rik van Riel
2017-03-10 10:27 ` Michal Hocko
2017-03-10 10:20 ` Michal Hocko
2017-03-10 11:44 ` Tetsuo Handa
2017-03-21 10:37 ` Tetsuo Handa
2017-04-23 10:24 ` Tetsuo Handa
2017-04-24 12:39 ` Stanislaw Gruszka
2017-04-24 13:06 ` Tetsuo Handa
2017-04-25 6:33 ` Stanislaw Gruszka
2017-06-30 0:14 ` Tetsuo Handa
2017-06-30 13:32 ` Michal Hocko
2017-06-30 15:59 ` Tetsuo Handa
2017-06-30 16:19 ` Michal Hocko
2017-07-01 11:43 ` Tetsuo Handa
2017-07-05 8:19 ` Michal Hocko
2017-07-05 8:20 ` Michal Hocko
2017-07-06 10:48 ` Tetsuo Handa
2017-03-09 14:31 ` Mel Gorman [this message]
2017-07-10 7:48 Michal Hocko
2017-07-10 13:16 ` Vlastimil Babka
2017-07-10 13:58 ` Rik van Riel
2017-07-10 16:58 ` Johannes Weiner
2017-07-10 17:09 ` Michal Hocko
2017-07-19 22:20 ` Andrew Morton
2017-07-20 6:56 ` Michal Hocko
2017-07-21 23:01 ` Andrew Morton
2017-07-24 6:50 ` Michal Hocko
2017-07-20 1:54 ` Hugh Dickins
2017-07-20 10:44 ` Tetsuo Handa
2017-07-24 7:01 ` Hugh Dickins
2017-07-24 11:12 ` Tetsuo Handa
2017-07-20 13:22 ` Michal Hocko
2017-07-24 7:03 ` Hugh Dickins
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