linux-kernel - Re: [PATCH V3 1/2] mm, vmscan: prevent kswapd livelock due to pfmemalloc-throttled process being killed

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Date:	Mon, 05 Jan 2015 21:45:32 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Vlastimil Babka <vbabka@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
CC:	linux-kernel@...r.kernel.org,
	Vladimir Davydov <vdavydov@...allels.com>,
	stable@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH V3 1/2] mm, vmscan: prevent kswapd livelock due to pfmemalloc-throttled
 process being killed

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On 01/05/2015 03:56 AM, Vlastimil Babka wrote:
> Charles Shirron and Paul Cassella from Cray Inc have reported
> kswapd stuck in a busy loop with nothing left to balance, but
> kswapd_try_to_sleep() failing to sleep. Their analysis found the
> cause to be a combination of several factors:

> Fixes: 5515061d22f0 ("mm: throttle direct reclaimers if PF_MEMALLOC
> reserves are low and swap is backed by network storage") 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz> Signed-off-by:
> Vladimir Davydov <vdavydov@...allels.com> Cc:
> <stable@...r.kernel.org>   # v3.6+ Cc: Mel Gorman
> <mgorman@...e.de> Cc: Johannes Weiner <hannes@...xchg.org> Cc:
> Michal Hocko <mhocko@...e.cz> Cc: Rik van Riel <riel@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

- -- 
All rights reversed
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