linux-kernel - [RFC Patch V1 09/30] mm, memcg: Use cpu_to_mem()/numa_mem

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Message-Id: <1405064267-11678-10-git-send-email-jiang.liu@linux.intel.com>
Date:	Fri, 11 Jul 2014 15:37:26 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: [RFC Patch V1 09/30] mm, memcg: Use cpu_to_mem()/numa_mem_id() to support memoryless node

When CONFIG_HAVE_MEMORYLESS_NODES is enabled, cpu_to_node()/numa_node_id()
may return a node without memory, and later cause system failure/panic
when calling kmalloc_node() and friends with returned node id.
So use cpu_to_mem()/numa_mem_id() instead to get the nearest node with
memory for the/current cpu.

If CONFIG_HAVE_MEMORYLESS_NODES is disabled, cpu_to_mem()/numa_mem_id()
is the same as cpu_to_node()/numa_node_id().

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a2c7bcb0e6eb..d6c4b7255ca9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1933,7 +1933,7 @@ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
 	 * we use curret node.
 	 */
 	if (unlikely(node == MAX_NUMNODES))
-		node = numa_node_id();
+		node = numa_mem_id();
 
 	memcg->last_scanned_node = node;
 	return node;
-- 
1.7.10.4

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