linux-kernel - Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

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Date:	Mon, 21 Aug 2006 11:47:06 +0900
From:	Magnus Damm <magnus@...inux.co.jp>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	Andrey Savochkin <saw@...ru>, Rik van Riel <riel@...hat.com>,
	ckrm-tech@...ts.sourceforge.net, Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, rohitseth@...gle.com,
	hugh@...itas.com, Ingo Molnar <mingo@...e.hu>,
	Kirill Korotaev <dev@...ru>, devel@...nvz.org,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

On Fri, 2006-08-18 at 07:45 -0700, Dave Hansen wrote:
> On Fri, 2006-08-18 at 12:08 +0400, Andrey Savochkin wrote:
> > 
> > A) Have separate memory management for each container,
> >    with separate buddy allocator, lru lists, page replacement mechanism.
> >    That implies a considerable overhead, and the main challenge there
> >    is sharing of pages between these separate memory managers.
> 
> Hold on here for just a sec...
> 
> It is quite possible to do memory management aimed at one container
> while that container's memory still participates in the main VM.  
> 
> There is overhead here, as the LRU scanning mechanisms get less
> efficient, but I'd rather pay a penalty at LRU scanning time than divide
> up the VM, or coarsely start failing allocations.

This could of course be solved with one LRU per container, which is how
the CKRM memory controller implemented things about a year ago.

/ magnus

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