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Date: Fri, 10 Jan 2014 16:39:09 -0600
From: Alex Thorlton <athorlton@sgi.com>
Subject: Re: [RFC PATCH] mm: thp: Add per-mm_struct flag to control THP
Message-ID: <20140110223909.GA8666@sgi.com>
References: <1389383718-46031-1-git-send-email-athorlton@sgi.com>
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To: Peter Zijlstra <peterz@infradead.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>, linux-mm@kvack.org, Ingo Molnar <mingo@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Rik van Riel <riel@redhat.com>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Oleg Nesterov <oleg@redhat.com>, "Eric W. Biederman" <ebiederm@xmission.com>, Andy Lutomirski <luto@amacapital.net>, Al Viro <viro@zeniv.linux.org.uk>, Kees Cook <keescook@chromium.org>, Andrea Arcangeli <aarcange@redhat.com>, linux-kernel@vger.kernel.org, Mel Gorman <mgorman@suse.de>

On Fri, Jan 10, 2014 at 11:10:10PM +0100, Peter Zijlstra wrote:
> We already have the information to determine if a page is shared across
> nodes, Mel even had some prototype code to do splits under those
> conditions.

I'm aware that we can determine if pages are shared across nodes, but I
thought that Mel's code to split pages under these conditions had some
performance issues.  I know I've seen the code that Mel wrote to do
this, but I can't seem to dig it up right now.  Could you point me to
it?

- Alex

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