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Subject[tip:sched/core] mm: numa: Do not account for a hinting fault if we raced
Commit-ID:  0c3a775e1e0b069bf765f8355b723ce0d18dcc6c
Gitweb: http://git.kernel.org/tip/0c3a775e1e0b069bf765f8355b723ce0d18dcc6c
Author: Mel Gorman <mgorman@suse.de>
AuthorDate: Mon, 7 Oct 2013 11:28:42 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 9 Oct 2013 12:39:40 +0200

mm: numa: Do not account for a hinting fault if we raced

If another task handled a hinting fault in parallel then do not double
account for it.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-5-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
mm/huge_memory.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 19dbb08..dab2bab 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1325,8 +1325,11 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,

check_same:
spin_lock(&mm->page_table_lock);
- if (unlikely(!pmd_same(pmd, *pmdp)))
+ if (unlikely(!pmd_same(pmd, *pmdp))) {
+ /* Someone else took our fault */
+ current_nid = -1;
goto out_unlock;
+ }
clear_pmdnuma:
pmd = pmd_mknonnuma(pmd);
set_pmd_at(mm, haddr, pmdp, pmd);

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