linux-kernel - Re: [patch 0/8] mm: thrash detection-based file cache sizing v5

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Message-ID: <5284F201.4040607@redhat.com>
Date:	Thu, 14 Nov 2013 10:53:37 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Bob Liu <lliubbo@...il.com>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Michel Lespinasse <walken@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Metin Doslu <metin@...usdata.com>,
	Vlastimil Babka <vbabka@...e.cz>, Tejun Heo <tj@...nel.org>,
	Linux-MM <linux-mm@...ck.org>, linux-fsdevel@...r.kernel.org,
	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/8] mm: thrash detection-based file cache sizing v5

On 11/12/2013 05:30 AM, Bob Liu wrote:
> Hi Johannes,
>
> On Fri, Oct 11, 2013 at 5:46 AM, Johannes Weiner <hannes@...xchg.org> wrote:
>>          Future
>>
>> Right now we have a fixed ratio (50:50) between inactive and active
>> list but we already have complaints about working sets exceeding half
>> of memory being pushed out of the cache by simple used-once streaming
>> in the background.  Ultimately, we want to adjust this ratio and allow
>> for a much smaller inactive list.  These patches are an essential step
>> in this direction because they decouple the VMs ability to detect
>> working set changes from the inactive list size.  This would allow us
>> to base the inactive list size on something more sensible, like the
>> combined readahead window size for example.
>>
>
> I found that this patchset have the similar purpose as
> Zcache(http://lwn.net/Articles/562254/) in some way.

Sorry, but that is unrelated.

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