linux-kernel - Re: [RFC][PATCH 4/7] RSS accounting hooks over the code

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Message-ID: <45F588DE.3000309@sw.ru>
Date:	Mon, 12 Mar 2007 20:07:42 +0300
From:	Kirill Korotaev <dev@...ru>
To:	Dave Hansen <hansendc@...ibm.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.osdl.org, Paul Menage <menage@...gle.com>,
	Pavel Emelianov <xemul@...ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 4/7] RSS accounting hooks over the code

> On Mon, 2007-03-12 at 19:23 +0300, Kirill Korotaev wrote:
> 
>>For these you essentially need per-container page->_mapcount counter,
>>otherwise you can't detect whether rss group still has the page in question being mapped
>>in its processes' address spaces or not. 
> 
> 
> What do you mean by this?  You can always tell whether a process has a
> particular page mapped.  Could you explain the issue a bit more.  I'm
> not sure I get it.
When we do charge/uncharge we have to answer on another question:
"whether *any* task from the *container* has this page mapped", not the
"whether *this* task has this page mapped".

Thanks,
Kirill
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