Message-ID: <4212350D.3060501@sgi.com>
Date: Tue, 15 Feb 2005 11:44:45 -0600
From: Ray Bryant <raybry@sgi.com>
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To: Robin Holt <holt@sgi.com>
CC: Andi Kleen <ak@muc.de>, Ray Bryant <raybry@austin.rr.com>,
       linux-mm <linux-mm@kvack.org>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [RFC 2.6.11-rc2-mm2 0/7] mm: manual page migration -- overview
References: <20050212032535.18524.12046.26397@tomahawk.engr.sgi.com> <m1vf8yf2nu.fsf@muc.de> <42114279.5070202@sgi.com> <20050215110506.GD19658@lnx-holt.americas.sgi.com>
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Robin Holt wrote:
> On Mon, Feb 14, 2005 at 06:29:45PM -0600, Ray Bryant wrote:
> 
>>which is what you are asking for, I think.  The library's job
>>(in addition to suspending all of the processes in the list for
>>the duration of the migration operation, plus do some other things
>>that are specific to sn2 hardware) would be to examine the
> 
> 
> You probably want the batch scheduler to do the suspend/resume as it
> may be parking part of the job on nodes that have memory but running
> processes of a different job while moving a job out of the way for a
> big-mem app that wants to run on one of this jobs nodes.
> 

That works as well, and if we keep the majority of the work on
deciding who to migrate where and what to do when in a user space
library rather than in the kernel, then we have a lot more flexibility
in, for example who suspends/resumes the jobs to be migrated.

> 
>>do memory placement by first touch, during initialization.  This is,
>>in part, because most of our codes originate on non-NUMA systems,
>>and we've typically done very just what is necessary to make them
> 
> 
> Software Vendors tend to be very reluctant to do things for a single
> architecture unless there are clear wins.
> 
> Thanks,
> Robin
> 


-- 
-----------------------------------------------
Ray Bryant
512-453-9679 (work)         512-507-7807 (cell)
raybry@sgi.com             raybry@austin.rr.com
The box said: "Requires Windows 98 or better",
	 so I installed Linux.
-----------------------------------------------
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