linux-kernel - Re: The performance and behaviour of the anti-fragmentation related patches

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Message-ID: <45E7835A.8000908@in.ibm.com>
Date:	Fri, 02 Mar 2007 07:22:26 +0530
From:	Balbir Singh <balbir@...ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@...net.ie>, npiggin@...e.de,
	clameter@...r.sgi.com, mingo@...e.hu, jschopp@...tin.ibm.com,
	arjan@...radead.org, mbligh@...igh.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches

Linus Torvalds wrote:
> On Thu, 1 Mar 2007, Andrew Morton wrote:
>> So some urgent questions are: how are we going to do mem hotunplug and
>> per-container RSS?
> 
> Also: how are we going to do this in virtualized environments? Usually the 
> people who care abotu memory hotunplug are exactly the same people who 
> also care (or claim to care, or _will_ care) about virtualization.
> 
> My personal opinion is that while I'm not a huge fan of virtualization, 
> these kinds of things really _can_ be handled more cleanly at that layer, 
> and not in the kernel at all. Afaik, it's what IBM already does, and has 
> been doing for a while. There's no shame in looking at what already works, 
> especially if it's simpler.

Could you please clarify as to what "that layer" means - is it the
firmware/hardware for virtualization? or does it refer to user space?
With virtualization the linux kernel would end up acting as a hypervisor
and resource management support like per-container RSS support needs to
be built into the kernel.

It would also be useful to have a resource controller like per-container
RSS control (container refers to a task grouping) within the kernel or
non-virtualized environments as well.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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