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authorMel Gorman <mgorman@suse.de>2013-12-18 17:08:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-18 19:04:51 -0800
commit3c67f474558748b604e247d92b55dfe89654c81d (patch)
tree501810c12c591b51393b01c8271c2837c95c618a /kernel
parenteb4489f69f224356193364dc2762aa009738ca7f (diff)
downloadblackbird-op-linux-3c67f474558748b604e247d92b55dfe89654c81d.tar.gz
blackbird-op-linux-3c67f474558748b604e247d92b55dfe89654c81d.zip
sched: numa: skip inaccessible VMAs
Inaccessible VMA should not be trapping NUMA hint faults. Skip them. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Alex Thorlton <athorlton@sgi.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/fair.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9030da7bcb15..c7395d97e4cb 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1738,6 +1738,13 @@ void task_numa_work(struct callback_head *work)
(vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ)))
continue;
+ /*
+ * Skip inaccessible VMAs to avoid any confusion between
+ * PROT_NONE and NUMA hinting ptes
+ */
+ if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
+ continue;
+
do {
start = max(start, vma->vm_start);
end = ALIGN(start + (pages << PAGE_SHIFT), HPAGE_SIZE);
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