linux-kernel - Re: [PATCH 0.14] oom detection rework v6

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Message-ID: <57318932.3030804@suse.cz>
Date:	Tue, 10 May 2016 09:09:38 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <js1304@...il.com>, Michal Hocko <mhocko@...nel.org>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0.14] oom detection rework v6

On 05/10/2016 08:41 AM, Joonsoo Kim wrote:
> You applied band-aid for CONFIG_COMPACTION and fixed some reported
> problem but it is also fragile. Assume almost pageblock's skipbit are
> set. In this case, compaction easily returns COMPACT_COMPLETE and your
> logic will stop retry. Compaction isn't designed to report accurate
> fragmentation state of the system so depending on it's return value
> for OOM is fragile.

Guess I'll just post a RFC now, even though it's not much tested...