linux-kernel - Re: [PATCH] memcg: Fix documentation

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Date:	Wed, 8 Apr 2009 17:37:47 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	bharata@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] memcg: Fix documentation

On Wed, 8 Apr 2009 14:03:27 +0530
Bharata B Rao <bharata@...ux.vnet.ibm.com> wrote:

> > > -a. Enable control of both RSS (mapped) and Page Cache (unmapped) pages
> > > +a. Enable control of RSS (mapped), Page Cache (unmapped) and Swap cache
> > > +   (unmapped) pages.
> >       Enable control of Anonymous memory, Page Cache and Swap Cache. 
> > ?
> 
> I feel without the terms 'mapped' and 'unmaapped', the story of the memory
> controller is not complete :)
> 
Hmm ?.
     Anonymoys memory, File Cache(both of mapped/unmapped), SwapCache.
(At doing user support, explaining SwapCache is difficult sometimes ;)

I don't have serious concern, anyway.


> > 
> > > +pgpgin		- # of pages paged in (equivalent to # of charging events).
> > > +pgpgout		- # of pages paged out (equivalent to # of uncharging events).
> > > +active_anon	- # of bytes of anonymous memory on active lru list.
> >                                 anonymous memory + shared memory(tmpfs) + SwapCache.
> 
> Ok.
> 
> >                           Seeing acitive/inactive_file, how about swap-backed memory ?
> 
> Not sure what you are hinting at here.
> 
Ah, sorry. I just thought swap-backed v.s. file-backed pages explains all.

Thanks,
-Kame

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