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Date: Thu, 12 Dec 2013 12:11:34 -0800
From: Andy Lutomirski <luto@...capital.net>
To: Alex Thorlton <athorlton@....com>
Cc: "linux-mm@...ck.org" <linux-mm@...ck.org>,
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>,
Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
Mel Gorman <mgorman@...e.de>,
Michel Lespinasse <walken@...gle.com>,
Benjamin LaHaise <bcrl@...ck.org>,
Oleg Nesterov <oleg@...hat.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Al Viro <viro@...iv.linux.org.uk>,
David Rientjes <rientjes@...gle.com>,
Zhang Yanfei <zhangyanfei@...fujitsu.com>,
Peter Zijlstra <peterz@...radead.org>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.cz>,
Jiang Liu <jiang.liu@...wei.com>,
Cody P Schafer <cody@...ux.vnet.ibm.com>,
Glauber Costa <glommer@...allels.com>,
Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 2/3] Add tunable to control THP behavior
On Thu, Dec 12, 2013 at 10:00 AM, Alex Thorlton <athorlton@....com> wrote:
> This part of the patch adds a tunable to
> /sys/kernel/mm/transparent_hugepage called threshold. This threshold
> determines how many pages a user must fault in from a single node before
> a temporary compound page is turned into a THP.
Is there a setting that will turn off the must-be-the-same-node
behavior? There are workloads where TLB matters more than cross-node
traffic (or where all the pages are hopelessly shared between nodes,
but hugepages are still useful).
--Andy
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