linux-kernel - Re: swap hint

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Message-Id: <20090421120151.ae291dbd.kamezawa.hiroyu@jp.fujitsu.com>
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

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