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sched: numa: skip inaccessible VMAs

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commit 3c67f47455 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>
This commit is contained in:
Mel Gorman
2013-12-18 17:08:40 -08:00
committed by Greg Kroah-Hartman
parent 8164ddf1f6
commit 13ea54872a
1 changed files with 7 additions and 0 deletions
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7
kernel/sched/fair.c
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@@ -936,6 +936,13 @@ void task_numa_work(struct callback_head *work)
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);