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

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Date:	Sat, 23 Jun 2012 11:53:16 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Minchan Kim <minchan@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>,
	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>,
	Pekka Enberg <penberg@...nel.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: RFC:  Easy-Reclaimable LRU list

On 06/23/2012 12:45 AM, Kamezawa Hiroyuki wrote:

> I think this is interesting approach. Major concern is how to guarantee
> EReclaimable
> pages are really EReclaimable...Do you have any idea ? madviced pages
> are really EReclaimable ?

I suspect the EReclaimable pages can only be clean page
cache pages that are not mapped by any processes.

Once somebody tries to use the page, mark_page_accessed
will move it to another list.

> A (very) small concern is will you use one more page-flags for this ? ;)

This could be an issue on a 32 bit system, true.

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