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Date: Mon, 20 Apr 2009 16:11:14 +0100 From: "Wil" <nodenet@...mail.com> To: <linux-kernel@...r.kernel.org> Cc: <nodenet@...mail.com> Subject: swap hint 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 -- 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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