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

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Date:	Fri, 15 Sep 2006 12:49:13 +0400
From:	Kirill Korotaev <dev@...ru>
To:	sekharan@...ibm.com
CC:	Pavel Emelianov <xemul@...nvz.org>, balbir@...ibm.com,
	Srivatsa <vatsa@...ibm.com>, Rik van Riel <riel@...hat.com>,
	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>, devel@...nvz.org,
	Matt Helsley <matthltc@...ibm.com>,
	Hugh Dickins <hugh@...itas.com>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Oleg Nesterov <oleg@...sign.ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added	user
 memory)

> <snip>
> 
>>Reserving in advance means that sometimes you won't be able to start a
>>new group without taking back some of reserved pages. This is ... strange.
> 
> 
> I do not see it strange. At the time of creation, user sees the failure
> (that there isn't enough resource to provide the required/requested
> guarantee) and can act accordingly.
> 
> BTW, VMware does it this way.
This is not true at least for ESX server.
It overcommits memory and does dirty tricks like balooning to free memory then.

[...]

> We would need at least:
>  - BC should be created/deleted explicitly by the user
>  - cleaner interface for controller writers
why do you bother for the last too much?
The number of controlers is quite limited...

Kirill
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