linux-kernel - Re: [RFC 11/13] mm, compaction: add the ultimate direct compaction priority

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Message-ID: <573C6418.3010408@suse.cz>
Date:	Wed, 18 May 2016 14:46:16 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Johannes Weiner <hannes@...xchg.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC 11/13] mm, compaction: add the ultimate direct compaction
 priority

On 05/16/2016 09:17 AM, Vlastimil Babka wrote:
>> >Wouldn't it be better to pull the prio check into compaction_deferred
>> >directly? There are more callers and I am not really sure all of them
>> >would behave consistently.
> I'll check, thanks.

Hm so the other callers of compaction_deferred() are in the context 
where there's no direct compaction priority set. They would have to pass 
something like DEF_COMPACT_PRIORITY. That starts getting subtle so I'd 
rather not go that way.