linux-kernel - Re: [PATCH] mm/compaction: reset compaction scanner positions

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Message-ID: <5510BCAC.5010101@lge.com>
Date:	Tue, 24 Mar 2015 10:23:56 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	David Rientjes <rientjes@...gle.com>
CC:	akpm@...ux-foundation.org, vbabka@...e.cz, iamjoonsoo.kim@....com,
	mgorman@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	gunho.lee@....com, Gioh Kim <gioh.kim@....c>
Subject: Re: [PATCH] mm/compaction: reset compaction scanner positions



2015-03-24 오전 8:16에 David Rientjes 이(가) 쓴 글:
> On Sat, 21 Mar 2015, Gioh Kim wrote:
>
>> When the compaction is activated via /proc/sys/vm/compact_memory
>> it would better scan the whole zone.
>> And some platform, for instance ARM, has the start_pfn of a zone is zero.
>> Therefore the first try to compaction via /proc doesn't work.
>> It needs to force to reset compaction scanner position at first.
>>
>> Signed-off-by: Gioh Kim <gioh.kim@....c>
>
> That shouldn't be a valid email address.

It's my fault. I'm going to send patch again.

>
>> Acked-by: Vlastimil Babka <vbabka@...e.cz>
>
> Acked-by: David Rientjes <rientjes@...gle.com>
>
> I was thinking that maybe this would be better handled as part of the
> comapct_zone() logic, i.e. set cc->free_pfn and cc->migrate_pfn based on a
> helper function that understands cc->order == -1 should compact the entire
> zone.  However, after scanning the entire zone as a result of this write,
> the existing cached pfns probably don't matter anymore.  So this seems
> fine.
>
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