linux-kernel - Re: [RFC 4/4] mm: free reclaimed pages instantly without depending next reclaim

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Date:	Wed, 15 May 2013 16:12:20 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>
Subject: Re: [RFC 4/4] mm: free reclaimed pages instantly without depending
 next reclaim

Hey Rik,

On Tue, May 14, 2013 at 01:32:33PM -0400, Rik van Riel wrote:
> On 05/12/2013 10:10 PM, Minchan Kim wrote:
> >Normally, file I/O for reclaiming is asynchronous so that
> >when page writeback is completed, reclaimed page will be
> >rotated into LRU tail for fast reclaiming in next turn.
> >But it makes unnecessary CPU overhead and more iteration with higher
> >priority of reclaim could reclaim too many pages than needed
> >pages.
> >
> >This patch frees reclaimed pages by paging out instantly without
> >rotating back them into LRU's tail when the I/O is completed so
> >that we can get out of reclaim loop as soon as poosbile and avoid
> >unnecessary CPU overhead for moving them.
> >
> >Signed-off-by: Minchan Kim <minchan@...nel.org>
> 
> I like this approach and am looking forward to your v2 series,
> with the reworked patch 3/4.

I will do it after I finish more urgent works. :)
I am looking forward to seeing your review, then.

Thanks for the interest.

-- 
Kind regards,
Minchan Kim
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