linux-kernel - Re: [PATCH 07/11] mm, compaction: Update compaction

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Date:	Mon, 11 Apr 2016 14:16:54 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Michal Hocko <mhocko@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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>,
	Joonsoo Kim <js1304@...il.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 07/11] mm, compaction: Update compaction_result ordering

On 04/05/2016 01:25 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
>
> compaction_result will be used as the primary feedback channel for
> compaction users. At the same time try_to_compact_pages (and potentially
> others) assume a certain ordering where a more specific feedback takes
> precendence. This gets a bit awkward when we have conflicting feedback
> from different zones. E.g one returing COMPACT_COMPLETE meaning the full
> zone has been scanned without any outcome while other returns with
> COMPACT_PARTIAL aka made some progress. The caller should get
> COMPACT_PARTIAL because that means that the compaction still can make
> some progress. The same applies for COMPACT_PARTIAL vs.
> COMPACT_PARTIAL_SKIPPED. Reorder PARTIAL to be the largest one so the
> larger the value is the more progress we have done.
>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>