linux-kernel - Re: [Devel] Re: [RFC][PATCH 2/7] RSS controller core

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Date:	Sun, 18 Mar 2007 15:44:24 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Dave Hansen" <hansendc@...ibm.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	containers@...ts.osdl.org, "Mel Gorman" <MELGOR@...ibm.com>,
	linux-kernel@...r.kernel.org, "Andy Wihitcroft" <apw@...dowen.org>
Subject: Re: [Devel] Re: [RFC][PATCH 2/7] RSS controller core

On 3/13/07, Dave Hansen <hansendc@...ibm.com> wrote:
> How do we determine what is shared, and goes into the shared zones?
> Once we've allocated a page, it's too late because we already picked.
> Do we just assume all page cache is shared?  Base it on filesystem,
> mount, ...?  Mount seems the most logical to me, that a sysadmin would
> have to set up a container's fs, anyway, and will likely be doing
> special things to shared data, anyway (r/o bind mounts :).

I played with an approach where you can bind a dentry to a set of
memory zones, and any children of that dentry would inherit the
mempolicy; I was envisaging that most data wouldn't be shared between
different containers/jobs, and that userspace would set up "shared"
zones for big shared regions such as /lib, /usr, /bin, and for
specially-known cases of sharing.

> If we really do bind a set of processes strongly to a set of memory on a
> set of nodes, then those really do become its home NUMA nodes.  If the
> CPUs there get overloaded, running it elsewhere will continue to grab
> pages from the home.  Would this basically keep us from ever being able
> to move tasks around a NUMA system?

move_pages() will let you shuffle tasks from one node to another
without too much intrusion.

Paul
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