linux-kernel - Re: [PATCH -mm] Shared Page accounting for memory cgroup (v2)

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Message-ID: <20100106030752.GI3059@balbir.in.ibm.com>
Date:	Wed, 6 Jan 2010 08:37:52 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] Shared Page accounting for memory cgroup (v2)

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2010-01-06 09:07:08]:

> On Wed, 6 Jan 2010 00:22:26 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> 
> > Hi, All,
> > 
> > No major changes from v1, except for the use of get_mm_rss().
> > Kamezawa-San felt that this can be done in user space and I responded
> > to him with my concerns of doing it in user space. The thread
> > can be found at http://thread.gmane.org/gmane.linux.kernel.mm/42367.
> > 
> > If there are no major objections, can I ask for a merge into -mm.
> > Andrew, the patches are against mmotm 10 December 2009, if there
> > are some merge conflicts, please let me know, I can rebase after
> > you release the next mmotm.
> > 
> 
> The problem is that this isn't "shared" uasge but "considered to be shared"
> usage. Okay ?
>

Could you give me your definition of "shared". From the mem cgroup
perspective, total_rss (which is accumulated) subtracted from the
count of pages in the LRU which are RSS and FILE_MAPPED is shared, no?
I understand that some of the pages that might be shared, show up
in our LRU and accounting. These are not treated as shared by
our cgroup, but by other cgroups.
 
> Then I don't want to provide this misleading value as "official report" from
> the kernel. And this can be done in userland.
>

I explained some of the issues of doing this from user space, would
you be OK if I called them "non-private" pages?

-- 
	Balbir
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