From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755331AbcAROEU (ORCPT ); Mon, 18 Jan 2016 09:04:20 -0500 Received: from mail-pa0-f43.google.com ([209.85.220.43]:33375 "EHLO mail-pa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755294AbcAROEP (ORCPT ); Mon, 18 Jan 2016 09:04:15 -0500 From: Liang Chen To: n-horiguchi@ah.jp.nec.com, linux-mm@kvack.org Cc: riel@redhat.com, mgorman@suse.de, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Liang Chen , Gavin Guo Subject: [PATCH] mm:mempolicy: skip VM_HUGETLB and VM_MIXEDMAP VMA for lazy mbind Date: Mon, 18 Jan 2016 22:03:54 +0800 Message-Id: <1453125834-16546-1-git-send-email-liangchen.linux@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org VM_HUGETLB and VM_MIXEDMAP vma needs to be excluded to avoid compound pages being marked for migration and unexpected COWs when handling hugetlb fault. Thanks to Naoya Horiguchi for reminding me on these checks. Signed-off-by: Liang Chen Signed-off-by: Gavin Guo --- mm/mempolicy.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 436ff411..415de70 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -610,8 +610,9 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end, if (flags & MPOL_MF_LAZY) { /* Similar to task_numa_work, skip inaccessible VMAs */ - if (vma_migratable(vma) && - vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) + if (vma_migratable(vma) && !is_vm_hugetlb_page(vma) && + (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) && + !(vma->vm_flags & VM_MIXEDMAP)) change_prot_numa(vma, start, endvma); return 1; } -- 1.9.1