about page migration on UMA

Jacky(GuangXiang Lee)
2007-10-17T07:09:19Z

seems page migration is used mostly for NUMA platform to improve
performance.
But in a UMA architecture, Is it possible to use page migration to move
pages ?

----- Original Message -----
From: "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>
To: "David Rientjes" <rientjes@google.com>
Cc: <linux-mm@kvack.org>; <containers@lists.osdl.org>;
<balbir@linux.vnet.ibm.com>; <yamamoto@valinux.co.jp>
Sent: Wednesday, October 17, 2007 1:50 PM
Subject: Re: [PATCH] memory cgroup enhancements [1/5] force_empty for memory
cgroup

> On Tue, 16 Oct 2007 22:38:18 -0700 (PDT)
> David Rientjes <rientjes@google.com> wrote:
> > > Thanks,
> >
> > You mean make it write-only? Typically it would be as easy as only
> > specifying a mode of S_IWUSR so that it can only be written to, the
> > S_IFREG is already provided by cgroup_add_file().
> >
> > Unfortunately, cgroups do not appear to allow that. It hardcodes
> > the permissions of 0644 | S_IFREG into the cgroup_create_file() call
from
> > cgroup_add_file(), which is a bug. Cgroup files should be able to be
> > marked as read-only or write-only depending on their semantics.
> >
> > So until that bug gets fixed and you're allowed to pass your own file
> > modes to cgroup_add_files(), you'll have to provide the read function.
> >
> Hmm. it seems I have to read current cgroup code more.
> Thank you for advice.
>
> Regards,
> -Kame
>
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