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

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Message-ID: <51927531.8010507@redhat.com>
Date:	Tue, 14 May 2013 13:32:33 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan@...nel.org>
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

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.

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