From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752433AbaJBTRK (ORCPT ); Thu, 2 Oct 2014 15:17:10 -0400 Received: from cantor2.suse.de ([195.135.220.15]:42956 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751656AbaJBTRJ (ORCPT ); Thu, 2 Oct 2014 15:17:09 -0400 Date: Thu, 2 Oct 2014 20:17:03 +0100 From: Mel Gorman To: Andrew Morton Cc: Rik van Riel , Peter Zijlstra , Hugh Dickins , Linux Kernel , linux-mm@kvack.org Subject: [PATCH] mm: mempolicy: Skip inaccessible VMAs when setting MPOL_MF_LAZY Message-ID: <20141002191703.GN17501@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PROT_NUMA VMAs are skipped to avoid problems distinguishing between present, prot_none and special entries. MPOL_MF_LAZY is not visible from userspace since commit a720094ded8c ("mm: mempolicy: Hide MPOL_NOOP and MPOL_MF_LAZY from userspace for now") but it should still skip VMAs the same way task_numa_work does. Signed-off-by: Mel Gorman Acked-by: Rik van Riel --- mm/mempolicy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 8f5330d..a5877ce 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -683,7 +683,9 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end, } if (flags & MPOL_MF_LAZY) { - change_prot_numa(vma, start, endvma); + /* Similar to task_numa_work, skip inaccessible VMAs */ + if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) + change_prot_numa(vma, start, endvma); goto next; }