linux-kernel - Re: [patch for-3.14] mm, mempolicy: fix mempolicy printing in numa

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Message-ID: <20140127130914.GI4963@suse.de>
Date:	Mon, 27 Jan 2014 13:09:15 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch for-3.14] mm, mempolicy: fix mempolicy printing in
 numa_maps

On Mon, Jan 27, 2014 at 11:50:11AM +0100, Peter Zijlstra wrote:
> On Sat, Jan 25, 2014 at 07:12:35PM -0800, David Rientjes wrote:
> > As a result of commit 5606e3877ad8 ("mm: numa: Migrate on reference 
> > policy"), /proc/<pid>/numa_maps prints the mempolicy for any <pid> as 
> > "prefer:N" for the local node, N, of the process reading the file.
> > 
> > This should only be printed when the mempolicy of <pid> is MPOL_PREFERRED 
> > for node N.
> > 
> > If the process is actually only using the default mempolicy for local node 
> > allocation, make sure "default" is printed as expected.
> 
> Should we also consider printing the MOF and MORON states so we get a
> better view of what the actual policy is?
> 

MOF and MORON are separate issues because MOF is exposed to the userspace
API but not the policies that make up MORON. For MORON, I concluded that
we should not expose that via numa_maps unless it can be controlled from
userspace.

-- 
Mel Gorman
SUSE Labs
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