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authorMel Gorman <mgorman@suse.de>2013-10-07 11:28:42 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-13 12:05:33 +0900
commit699ba929e88a0c2b172e7beebf10fd37ef120142 (patch)
tree829fb086fc9abe080dfffaf0b499608e4aaecab6
parent165b4f8bf37ba929924e9099bd9a1ee5031cf4e7 (diff)
mm: numa: Do not account for a hinting fault if we raced
commit 1dd49bfa3465756b3ce72214b58a33e4afb67aa3 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--mm/huge_memory.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0164b09c1e9..7b09fe75799 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1335,8 +1335,11 @@ 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);