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

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Message-ID: <CAHGf_=rqTnmm-kTBZQs8NwOX2yKh=fxJ58-uPcL6cb7K3tk9Og@mail.gmail.com>
Date:	Sun, 24 Jun 2012 07:09:30 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	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>,
	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 Sat, Jun 23, 2012 at 11:53 AM, Rik van Riel <riel@...hat.com> wrote:
> 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.

100% agree.


>> 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.

Do we really need SwapBacked bit? Actually swap-backed is
per-superblock attribute and don't change dynamically (i.e. no race
happen). thus this bit
might be able to move into page->mapping or page->mapping->host.
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