linux-kernel - [PATCH 25/35] autonuma: default mempolicy follow AutoNUMA

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Date:	Fri, 25 May 2012 19:02:29 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>
Subject: [PATCH 25/35] autonuma: default mempolicy follow AutoNUMA

If the task has already been moved to an autonuma_node try to allocate
memory from it even if it's temporarily not the local node. Chances
are it's where most of its memory is already located and where it will
run in the future.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 mm/mempolicy.c |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 88f9422..b6b88f6 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1925,10 +1925,21 @@ retry_cpuset:
 	 */
 	if (pol->mode == MPOL_INTERLEAVE)
 		page = alloc_page_interleave(gfp, order, interleave_nodes(pol));
-	else
+	else {
+		int nid;
+#ifdef CONFIG_AUTONUMA
+		nid = -1;
+		if (current->sched_autonuma)
+			nid = current->sched_autonuma->autonuma_node;
+		if (nid < 0)
+			nid = numa_node_id();
+#else
+		nid = numa_node_id();
+#endif
 		page = __alloc_pages_nodemask(gfp, order,
-				policy_zonelist(gfp, pol, numa_node_id()),
+				policy_zonelist(gfp, pol, nid),
 				policy_nodemask(gfp, pol));
+	}
 
 	if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
 		goto retry_cpuset;
--
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