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Date: Fri, 15 Sep 2006 12:49:13 +0400
From: Kirill Korotaev <dev@sw.ru>
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To: sekharan@us.ibm.com
CC: Pavel Emelianov <xemul@openvz.org>, balbir@in.ibm.com,
       Srivatsa <vatsa@in.ibm.com>, Rik van Riel <riel@redhat.com>,
       CKRM-Tech <ckrm-tech@lists.sourceforge.net>,
       Dave Hansen <haveblue@us.ibm.com>,
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       Andi Kleen <ak@suse.de>, Christoph Hellwig <hch@infradead.org>,
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       Alexey Dobriyan <adobriyan@mail.ru>, Oleg Nesterov <oleg@tv-sign.ru>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added	user
 memory)
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> <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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