Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 058/144] sched: numa: skip inaccessible VMAs | Date | Mon, 6 Jan 2014 14:36:59 -0800 |
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3.12-stable review patch. If anyone has any objections, please let me know.
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From: Mel Gorman <mgorman@suse.de>
commit 3c67f474558748b604e247d92b55dfe89654c81d upstream.
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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- kernel/sched/fair.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -974,6 +974,13 @@ void task_numa_work(struct callback_head if (vma->vm_end - vma->vm_start < HPAGE_SIZE) 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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