linux-kernel - [PATCH 11/15] sched: numa: Skip inaccessible VMAs

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Date:	Tue,  3 Dec 2013 08:51:58 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Alex Thorlton <athorlton@....com>
Cc:	Rik van Riel <riel@...hat.com>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 11/15] sched: numa: Skip inaccessible VMAs

Inaccessible VMA should not be trapping NUMA hint faults. Skip them.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 kernel/sched/fair.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7c70201..40d8ea3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -970,6 +970,13 @@ void task_numa_work(struct callback_head *work)
 		if (!vma_migratable(vma))
 			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;
+
 		/* Skip small VMAs. They are not likely to be of relevance */
 		if (vma->vm_end - vma->vm_start < HPAGE_SIZE)
 			continue;
-- 
1.8.4

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