linux-kernel - Re: [PATCH][RFCv2] mm/compaction: reset compaction scanner positions

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Message-ID: <550D5B9C.2000305@lge.com>
Date:	Sat, 21 Mar 2015 20:53:00 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	Vlastimil Babka <vbabka@...e.cz>, akpm@...ux-foundation.org,
	rientjes@...gle.com, iamjoonsoo.kim@....com, mgorman@...e.de
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, gunho.lee@....com
Subject: Re: [PATCH][RFCv2] mm/compaction: reset compaction scanner positions



2015-03-20 오후 10:49에 Vlastimil Babka 이(가) 쓴 글:
> On 03/20/2015 02:00 PM, Gioh Kim wrote:
>> I'm attaching the patch for discussion.
>> According to Vlastimil's advice, I move the reseting before compact_zone(),
>> and write more description.
>>
>> Vlastimil, can I have your name at Acked-by or Signed-off-by?
>
> Yes. But note below that whitespace seems broken in the patch.
>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
>
>> Which one do you prefer?
>
> Acked-by, as Signed-off-by is for maintainers who resend the patches towards Linus.
>
>> ------------------------- 8< ----------------------
>>
>>   From 575983c887e6478ca7cbba49a892dbc4cd69986b Mon Sep 17 00:00:00 2001
>> From: Gioh Kim <gioh.kim@....com>
>> Date: Fri, 20 Mar 2015 21:09:13 +0900
>> Subject: [PATCH] [RFCv2] mm/compaction: reset compaction scanner positions
>>
>> 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 as 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@....com>
>> ---
>>    mm/compaction.c |    8 ++++++++
>>    1 file changed, 8 insertions(+)
>>
>> diff --git a/mm/compaction.c b/mm/compaction.c
>> index 8c0d945..ccf48ce 100644
>> --- a/mm/compaction.c
>> +++ b/mm/compaction.c
>> @@ -1587,6 +1587,14 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
>>                   INIT_LIST_HEAD(&cc->freepages);
>>                   INIT_LIST_HEAD(&cc->migratepages);
>>
>> +               /*
>> +                * When called via /proc/sys/vm/compact_memory
>> +                * this makes sure we compact the whole zone regardless of
>> +                * cached scanner positions.
>> +                */
>> +               if (cc->order == -1)
>> +                       __reset_isolation_suitable(zone);
>
> Indentation seems off, some tabs vs spaces issue?

It's my email client. I'll send the patch again without [RFC].

>
>> +
>>                   if (cc->order == -1 || !compaction_deferred(zone, cc->order))
>>                           compact_zone(zone, cc);
>>
>> --
>> 1.7.9.5
>>
>>
>> --
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>>
>
>
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