linux-kernel - Re: Linux-VServer example results for sharing vs. separate mappings ...

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Message-Id: <E1HWozz-0000gh-By@be1.lrz>
Date:	Thu, 29 Mar 2007 09:24:43 +0200
From:	Bodo Eggert <7eggert@....de>
To:	Ethan Solomita <solo@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	Dave Hansen <hansendc@...ibm.com>
Subject: Re: Linux-VServer example results for sharing vs. separate mappings  ...

Ethan Solomita <solo@...gle.com> wrote:

>     I suggest a variant on what Andrew says: don't change reclaim.
> Instead, when referencing a page, don't mark the page as referenced if
> the current task is not permitted to allocate from the page's node. I'm
> thinking in terms of cpusets, with each task having a nodemask of
> mems_allowed. This may result in a page being thrown out unnecessarily
> and brought back in from disk, but when memory is tight that is what
> happens. An optimization might be to keep track of who is referencing
> the page and migrate it to their memory instead of reclaiming it, but
> that would require reclaim to know the task/cpuset/container of the
> referencing task.

If you are neaar reclaim and the page from that other node hasn't been
touched recently, maybe you could steal it. Off cause this is only
applicable if the checks are cheap enough.
-- 
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