linux-kernel - Re: [PATCH 4/4] mm: numa: Do not mark PTEs pte

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Message-ID: <CA+55aFzNGCiaL5fWpi_-JJXBhCuS+6CgUa0GpmFHRWWTGXp4fQ@mail.gmail.com>
Date:	Thu, 2 Oct 2014 12:26:02 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Sasha Levin <sasha.levin@...cle.com>, Mel Gorman <mgorman@...e.de>,
	Dave Jones <davej@...hat.com>, Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Michel Lespinasse <walken@...gle.com>,
	Kirill A Shutemov <kirill.shutemov@...ux.intel.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] mm: numa: Do not mark PTEs pte_numa when splitting
 huge pages

On Thu, Oct 2, 2014 at 12:07 PM, Kirill A. Shutemov
<kirill@...temov.name> wrote:
>
> I believe Sasha uses fakenuma in his KVM for that.

Ok, so the benchmarks won't do anything then.

I mean, I guess they might show some of the migration overhead, but
they won't show the actual end result in any meaningful manner, since
memory isn't actually NUMA.

                Linus
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