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Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures occur

To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures occur
From: Mel Gorman <mgorman@xxxxxxx>
Date: Thu, 12 Mar 2015 18:49:26 +0000
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Aneesh Kumar <aneesh.kumar@xxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, xfs@xxxxxxxxxxx, ppc-dev <linuxppc-dev@xxxxxxxxxxxxxxxx>
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User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Mar 12, 2015 at 09:20:36AM -0700, Linus Torvalds wrote:
> On Thu, Mar 12, 2015 at 6:10 AM, Mel Gorman <mgorman@xxxxxxx> wrote:
> >
> > I believe you're correct and it matches what was observed. I'm still
> > travelling and wireless is dirt but managed to queue a test using pmd_dirty
> 
> Ok, thanks.
> 
> I'm not entirely happy with that change, and I suspect the whole
> heuristic should be looked at much more (maybe it should also look at
> whether it's executable, for example), but it's a step in the right
> direction.
> 

I can follow up when I'm back in work properly. As you have already pulled
this in directly, can you also consider pulling in "mm: thp: return the
correct value for change_huge_pmd" please? The other two patches were very
minor can be resent through the normal paths later.

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