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

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Message-ID: <CA+55aFywW5JLq=BU_qb2OG5+pJ-b1v9tiS5Ygi-vtEKbEZ_T5Q@mail.gmail.com>
Date:	Mon, 9 Mar 2015 09:52:18 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, xfs@....sgi.com,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures occur

On Mon, Mar 9, 2015 at 4:29 AM, Dave Chinner <david@...morbit.com> 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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