linux-kernel - Re: [PATCH 1/5] mm, compaction: pass classzone_idx and alloc

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Message-ID: <544E0C43.3030009@suse.cz>
Date:	Mon, 27 Oct 2014 10:11:31 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
	Mel Gorman <mgorman@...e.de>,
	Michal Nazarewicz <mina86@...a86.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 1/5] mm, compaction: pass classzone_idx and alloc_flags
 to watermark checking

On 10/27/2014 07:46 AM, Joonsoo Kim wrote:
> On Tue, Oct 07, 2014 at 05:33:35PM +0200, Vlastimil Babka wrote:
> 
> Hello,
> 
> compaction_suitable() has one more zone_watermark_ok(). Why is it
> unchanged?

Hi,

it's a check whether there are enough free pages to perform compaction,
which means enough migration targets and temporary copies during
migration. These allocations are not affected by the flags of the
process that makes the high-order allocation.

> Thanks.
> 

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