This is a note to let you know that I've just added the patch titled
sched: numa: skip inaccessible VMAs
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-numa-skip-inaccessible-vmas.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3c67f474558748b604e247d92b55dfe89654c81d Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@xxxxxxx>
Date: Wed, 18 Dec 2013 17:08:40 -0800
Subject: sched: numa: skip inaccessible VMAs
From: Mel Gorman <mgorman@xxxxxxx>
commit 3c67f474558748b604e247d92b55dfe89654c81d upstream.
Inaccessible VMA should not be trapping NUMA hint faults. Skip them.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Alex Thorlton <athorlton@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
Patches currently in stable-queue which might be from mgorman@xxxxxxx are
queue-3.12/sched-numa-skip-inaccessible-vmas.patch
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