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

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Date:	Mon, 21 Aug 2006 11:42:58 +0900
From:	Magnus Damm <magnus@...inux.co.jp>
To:	rohitseth@...gle.com
Cc:	Andrew Morton <akpm@...l.org>, Rik van Riel <riel@...hat.com>,
	ckrm-tech@...ts.sourceforge.net, Dave Hansen <haveblue@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kirill Korotaev <dev@...ru>,
	Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, hugh@...itas.com,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelianov <xemul@...nvz.org>, devel@...nvz.org,
	Andi Kleen <ak@...e.de>
Subject: Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

On Fri, 2006-08-18 at 10:59 -0700, Rohit Seth wrote:
> On Fri, 2006-08-18 at 09:42 -0700, Andrew Morton wrote:
> > On Fri, 18 Aug 2006 07:45:48 -0700
> > Dave Hansen <haveblue@...ibm.com> 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.
> > > 
> > 
> > I have this mad idea that you can divide a 128GB machine up into 256 fake
> > NUMA nodes, then you use each "node" as a 512MB unit of memory allocation. 
> > So that 4.5GB job would be placed within an exclusive cpuset which has nine
> > "mems" (what are these called?) and voila: the job has a hard 4.5GB limit,
> > no kernel changes needed.
> > 
> Sounds like an interesting idea.  Will have to depend on something like
> memory hot-plug to get the things move around...

Yeah, moving things around: The pzone memory resource controller
introduces dynamically sized zones if I remember correctly.

http://www.opensubscriber.com/message/ckrm-tech@lists.sourceforge.net/3133911.html

/ magnus


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