linux-kernel - Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory)

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Date:	Tue, 12 Sep 2006 17:34:07 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Pavel Emelianov <xemul@...nvz.org>
Cc:	Rik van Riel <riel@...hat.com>, sekharan@...ibm.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>,
	Dave Hansen <haveblue@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>,
	Matt Helsley <matthltc@...ibm.com>,
	Hugh Dickins <hugh@...itas.com>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Kirill Korotaev <dev@...ru>, Oleg Nesterov <oleg@...sign.ru>,
	devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory)

On Tue, Sep 12, 2006 at 03:06:35PM +0400, Pavel Emelianov wrote:
> Hmmm... Beancounters can provide this after trivial changes.

All that is needed is some interface to set a thread's BC id (which you
seem to have already - sys_set_bcid)

> We may schedule them in current set of "pending" features
> (http://wiki.openvz.org/UBC_discussion)
> 
> But this can create a kind of DoS within an application:
>   A thread continuously touches new and new pages to it's BC and
> these pages are get touched by other threads also. Sooner or later

Any good reason why threads will touch each other's working set?
Sure nothing prevents them from touching, but I would expect each thread
(serving a separate domain) to work on its own set of private pages?

> this BC will hit it's limit and reclaiming this set of pages would affect
> all the other threads.

-- 
Regards,
vatsa
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