Message-ID: <4211BD88.70904@sgi.com>
Date: Tue, 15 Feb 2005 03:14:48 -0600
From: Ray Bryant <raybry@sgi.com>
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To: Paul Jackson <pj@sgi.com>
CC: ak@muc.de, holt@sgi.com, marcelo.tosatti@cyclades.com,
       raybry@austin.rr.com, linux-mm@kvack.org, 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>	<20050212155426.GA26714@logos.cnet>	<20050212212914.GA51971@muc.de>	<20050214163844.GB8576@lnx-holt.americas.sgi.com>	<20050214191509.GA56685@muc.de>	<42113921.7070807@sgi.com> <20050214191651.64fc3347.pj@sgi.com>
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Paul Jackson wrote:
> Ray wrote:
> 
>>[Thus the disclaimer in
>>the overview note that we have figured all the interaction with
>>memory policy stuff yet.]
> 
> 
> Does the same disclaimer apply to cpusets?
> 
> Unless it causes some undo pain, I would think that page migration
> should _not_ violate a tasks cpuset.  I guess this means that a typical
> batch manager would move a task to its new cpuset on the new nodes, or
> move the cpuset containing some tasks to their new nodes, before asking
> the page migrator to drag along the currently allocated pages from the
> old location.
> 
No, I think we understand the interaction between manual page migration
and cpusets.  We've tried to keep the discussion here disjoint from cpusets
for tactical reasons -- we didn't want to tie acceptance of the manual
page migration code to acceptance of cpusets.

The exact ordering of when a task is moved to a new cpuset and when the
migration occurs doesn't matter, AFAIK, if we accept the notion that
a migrated task is in suspended state until after everything associated
with it (including the new cpuset definition) is done.

-- 
-----------------------------------------------
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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