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Date: Tue, 21 Apr 2009 12:01:51 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: "Wil" <nodenet@...mail.com> Cc: <linux-kernel@...r.kernel.org> Subject: Re: swap hint On Mon, 20 Apr 2009 16:11:14 +0100 "Wil" <nodenet@...mail.com> wrote: > I've noticed that when running a VM such as qemu/vbox with approx 75% of > physical memory allocated with the default swappiness the swap file usage > will rise to approximately the same amount. Although setting swappiness to 0 > seems to prevent this, running with this setting seems counter intuitive. > I'm wondering if the following is or would be possible > > 1. Provide page hint to prevent swapping of certain pages. This would > presumably allow applications running in the remaining host memory to use > the swap file efficiently. > 2. Provide user space controls to prevent a certain process (or the memory > it allocates) being swapped. > > I'm not sure if memory ballooning will cover the above as I couldn't find > details of anything similar but would think that having some tunability for > special cases such as VMs would be useful especially if you could pick guest > performance / host memory usage on a per VM basis. I note that xen does seem > to do something along these lines as standard. > > Will Wiseman > Can't memory cgroup be a help for your case? - Documentation/cgroup/memory.txt Thanks, -Kame -- 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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