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

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures occur
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 9 Mar 2015 09:52:18 -0700
Cc: Ingo Molnar <mingo@xxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxx>, 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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On Mon, Mar 9, 2015 at 4:29 AM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
>
>> Also, is there some sane way for me to actually see this behavior on a
>> regular machine with just a single socket? Dave is apparently running
>> in some fake-numa setup, I'm wondering if this is easy enough to
>> reproduce that I could see it myself.
>
> Should be - I don't actually use 500TB of storage to generate this -
> 50GB on an SSD is all you need from the storage side. I just use a
> sparse backing file to make it look like a 500TB device. :P

What's your virtual environment setup? Kernel config, and
virtualization environment to actually get that odd fake NUMA thing
happening?

                          Linus

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