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From: zhong jiang <zhongjiang@huawei.com>
To: <akpm@linux-foundation.org>, <osalvador@suse.de>,
	<khandual@linux.vnet.ibm.com>, <mhocko@suse.com>,
	<mgorman@techsingularity.net>, <aarcange@redhat.com>
Cc: <rcampbell@nvidia.com>, <linux-mm@kvack.org>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCH] mm/mempolicy: Fix an incorrect rebind node in mpol_rebind_nodemask
Date: Sat, 25 May 2019 15:07:23 +0800	[thread overview]
Message-ID: <1558768043-23184-1-git-send-email-zhongjiang@huawei.com> (raw)

We bind an different node to different vma, Unluckily,
it will bind different vma to same node by checking the /proc/pid/numa_maps.   
Commit 213980c0f23b ("mm, mempolicy: simplify rebinding mempolicies when updating cpusets")
has introduced the issue.  when we change memory policy by seting cpuset.mems,
A process will rebind the specified policy more than one times. 
if the cpuset_mems_allowed is not equal to user specified nodes. hence the issue will trigger.
Maybe result in the out of memory which allocating memory from same node.

Fixes: 213980c0f23b ("mm, mempolicy: simplify rebinding mempolicies when updating cpusets") 
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 mm/mempolicy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index e3ab1d9..a60a3be 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -345,7 +345,7 @@ static void mpol_rebind_nodemask(struct mempolicy *pol, const nodemask_t *nodes)
 	else {
 		nodes_remap(tmp, pol->v.nodes,pol->w.cpuset_mems_allowed,
 								*nodes);
-		pol->w.cpuset_mems_allowed = tmp;
+		pol->w.cpuset_mems_allowed = *nodes;
 	}
 
 	if (nodes_empty(tmp))
-- 
1.7.12.4


             reply	other threads:[~2019-05-25  7:09 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-25  7:07 zhong jiang [this message]
2019-05-25 18:28 ` Andrew Morton
2019-05-27 12:23   ` Vlastimil Babka
2019-05-27 13:58     ` zhong jiang
2019-06-27  3:57       ` Andrew Morton
2019-06-27  7:47         ` Vlastimil Babka
2019-06-27  9:59 ` Vlastimil Babka

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