linux-kernel - [PATCH 20/36] autonuma: default mempolicy follow AutoNUMA

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Date:	Wed, 22 Aug 2012 16:59:04 +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>,
	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>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 20/36] autonuma: default mempolicy follow AutoNUMA

If an task_selected_nid has already been selected for the task, 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.

Acked-by: Rik van Riel <riel@...hat.com>
Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 mm/mempolicy.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index bd92431..19a8f72 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1951,10 +1951,18 @@ retry_cpuset:
 	 */
 	if (pol->mode == MPOL_INTERLEAVE)
 		page = alloc_page_interleave(gfp, order, interleave_nodes(pol));
-	else
+	else {
+		int nid = -1;
+#ifdef CONFIG_AUTONUMA
+		if (current->task_autonuma)
+			nid = current->task_autonuma->task_selected_nid;
+#endif
+		if (nid < 0)
+			nid = numa_node_id();
 		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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