linux-kernel - Re: [RFC 3/8] vmscan: make isolate_lru

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Message-ID: <BANLkTik9c7MVoHH+hjn7SHqMhW-6d4eoLg@mail.gmail.com>
Date:	Thu, 28 Apr 2011 08:18:54 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC 3/8] vmscan: make isolate_lru_page with filter aware

On Wed, Apr 27, 2011 at 5:03 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Wed, 27 Apr 2011 01:25:20 +0900
> Minchan Kim <minchan.kim@...il.com> wrote:
>
>> In some __zone_reclaim case, we don't want to shrink mapped page.
>> Nonetheless, we have isolated mapped page and re-add it into
>> LRU's head. It's unnecessary CPU overhead and makes LRU churning.
>>
>> Of course, when we isolate the page, the page might be mapped but
>> when we try to migrate the page, the page would be not mapped.
>> So it could be migrated. But race is rare and although it happens,
>> it's no big deal.
>>
>> Cc: Christoph Lameter <cl@...ux.com>
>> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
>> Cc: Mel Gorman <mgorman@...e.de>
>> Cc: Rik van Riel <riel@...hat.com>
>> Cc: Andrea Arcangeli <aarcange@...hat.com>
>> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
>
>
> Hmm, it seems mm/memcontrol.c::mem_cgroup_isolate_pages() should be updated, too.
>
> But it's okay you start from global LRU.

Yes. That's exactly what  I want. :)
I am supposed to consider memcg after concept is approved.

>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Thanks fore the review, Kame.
-- 
Kind regards,
Minchan Kim
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