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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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