linux-kernel - Re: RFC: Easy-Reclaimable LRU list

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Message-ID: <4FE82555.2010704@parallels.com>
Date:	Mon, 25 Jun 2012 12:46:13 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	John Stultz <john.stultz@...aro.org>,
	Pekka Enberg <penberg@...nel.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: RFC:  Easy-Reclaimable LRU list

On 06/19/2012 09:49 AM, Minchan Kim wrote:
> Hi everybody!
>
> Recently, there are some efforts to handle system memory pressure.
>
> 1) low memory notification - [1]
> 2) fallocate(VOLATILE) - [2]
> 3) fadvise(NOREUSE) - [3]
>
> For them, I would like to add new LRU list, aka "Ereclaimable" which is opposite of "unevictable".
> Reclaimable LRU list includes_easy_  reclaimable pages.
> For example, easy reclaimable pages are following as.
>
> 1. invalidated but remained LRU list.
> 2. pageout pages for reclaim(PG_reclaim pages)
> 3. fadvise(NOREUSE)
> 4. fallocate(VOLATILE)
>
> Their pages shouldn't stir normal LRU list and compaction might not migrate them, even.
What about other things moving memory like CMA ?



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