linux-kernel - Re: [patch 05/19] split LRU lists into anon & file sets

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Message-ID: <20080110032631.GE15547@balbir.in.ibm.com>
Date:	Thu, 10 Jan 2008 08:56:31 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Lee Schermerhorn <Lee.Schermerhorn@...com>
Subject: Re: [patch 05/19] split LRU lists into anon & file sets

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2008-01-10 11:36:18]:

> On Thu, 10 Jan 2008 07:51:33 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> 
> > > >  #define PAGE_CGROUP_FLAG_CACHE	(0x1)	/* charged as cache */
> > > >  #define PAGE_CGROUP_FLAG_ACTIVE (0x2)	/* page is active in this cgroup */
> > > > +#define PAGE_CGROUP_FLAG_FILE	(0x4)	/* page is file system backed */
> > > > 
> > > 
> > > Now, we don't have control_type and a feature for accounting only CACHE.
> > > Balbir-san, do you have some new plan ?
> > >
> > 
> > Hi, KAMEZAWA-San,
> > 
> > The control_type feature is gone. We still have cached page
> > accounting, but we do not allow control of only RSS pages anymore. We
> > need to control both RSS+cached pages. I do not understand your
> > question about new plan? Is it about adding back control_type?
> > 
> Ah, just wanted to confirm that we can drop PAGE_CGROUP_FLAG_CACHE
> if page_file_cache() function and split-LRU is introduced.
> 

Earlier we would have had a problem, since we even accounted for swap
cache with PAGE_CGROUP_FLAG_CACHE and I think page_file_cache() does
not account swap cache pages with page_file_cache(). Our accounting
is based on mapped vs unmapped whereas the new code from Rik accounts
file vs anonymous. I suspect we could live a little while longer
with PAGE_CGROUP_FLAG_CACHE and then if we do not need it at all,
we can mark it down for removal. What do you think?


-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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