linux-kernel - Re: [PATCH v2 0/5] Assorted compaction cleanups and optimizations

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Message-ID: <55BB94B3.7090603@suse.cz>
Date:	Fri, 31 Jul 2015 17:30:59 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Mel Gorman <mgorman@...e.de>,
	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v2 0/5] Assorted compaction cleanups and optimizations

On 07/31/2015 05:28 PM, Vlastimil Babka wrote:
> v2 changes:
>   - dropped Patch 6 as adjusting to Joonsoo's objection would be too
>     complicated and the results didn't justify it
>   - don't check for compound order > 0 in patches 4 and 5 as suggested by
>     Michal Nazarewicz. Negative values are handled by converting to unsinged
>     int, the pfn calculations work fine with 0 and it's unlikely to see 0
>     due to a race when we just checked PageCompound().

ah, also patch 3 calls reset_cached_positions() from 
__reset_isolation_suitable() as v1 missed a callsite by doing it 
separately (spotted by Joonsoo)

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