From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964982AbbFCRIM (ORCPT ); Wed, 3 Jun 2015 13:08:12 -0400 Received: from mga14.intel.com ([192.55.52.115]:60768 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964867AbbFCRHm (ORCPT ); Wed, 3 Jun 2015 13:07:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,547,1427785200"; d="scan'208";a="502216425" From: "Kirill A. Shutemov" To: Andrew Morton , Andrea Arcangeli , Hugh Dickins Cc: Dave Hansen , Mel Gorman , Rik van Riel , Vlastimil Babka , Christoph Lameter , Naoya Horiguchi , Steve Capper , "Aneesh Kumar K.V" , Johannes Weiner , Michal Hocko , Jerome Marchand , Sasha Levin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" Subject: [PATCHv6 28/36] mm, numa: skip PTE-mapped THP on numa fault Date: Wed, 3 Jun 2015 20:05:59 +0300 Message-Id: <1433351167-125878-29-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1433351167-125878-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1433351167-125878-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We're going to have THP mapped with PTEs. It will confuse numabalancing. Let's skip them for now. Signed-off-by: Kirill A. Shutemov Tested-by: Sasha Levin --- mm/memory.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index cdc20d674675..89dae13db3d3 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3179,6 +3179,12 @@ static int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, return 0; } + /* TODO: handle PTE-mapped THP */ + if (PageCompound(page)) { + pte_unmap_unlock(ptep, ptl); + return 0; + } + /* * Avoid grouping on RO pages in general. RO pages shouldn't hurt as * much anyway since they can be in shared cache state. This misses -- 2.1.4