linux-kernel - Re: [RFC PATCH] mm: thp: Add per-mm

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Message-ID: <20140110223909.GA8666@sgi.com>
Date:	Fri, 10 Jan 2014 16:39:09 -0600
From:	Alex Thorlton <athorlton@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rik van Riel <riel@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>
Subject: Re: [RFC PATCH] mm: thp: Add per-mm_struct flag to control THP

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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