From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756198Ab3JGRKo (ORCPT ); Mon, 7 Oct 2013 13:10:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42392 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753218Ab3JGRKn (ORCPT ); Mon, 7 Oct 2013 13:10:43 -0400 Message-ID: <5252EAFF.8040700@redhat.com> Date: Mon, 07 Oct 2013 13:10:23 -0400 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 MIME-Version: 1.0 To: Mel Gorman CC: Peter Zijlstra , Srikar Dronamraju , Ingo Molnar , Andrea Arcangeli , Johannes Weiner , Linux-MM , LKML Subject: Re: [PATCH 12/63] mm: numa: Do not migrate or account for hinting faults on the zero page References: <1381141781-10992-1-git-send-email-mgorman@suse.de> <1381141781-10992-13-git-send-email-mgorman@suse.de> In-Reply-To: <1381141781-10992-13-git-send-email-mgorman@suse.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/07/2013 06:28 AM, Mel Gorman wrote: > The zero page is not replicated between nodes and is often shared between > processes. The data is read-only and likely to be cached in local CPUs > if heavily accessed meaning that the remote memory access cost is less > of a concern. This patch prevents trapping faults on the zero pages. For > tasks using the zero page this will reduce the number of PTE updates, > TLB flushes and hinting faults. > > [peterz@infradead.org: Correct use of is_huge_zero_page] > Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel -- All rights reversed From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pb0-f43.google.com (mail-pb0-f43.google.com [209.85.160.43]) by kanga.kvack.org (Postfix) with ESMTP id 5C7986B0032 for ; Mon, 7 Oct 2013 13:10:40 -0400 (EDT) Received: by mail-pb0-f43.google.com with SMTP id md4so7349253pbc.30 for ; Mon, 07 Oct 2013 10:10:40 -0700 (PDT) Message-ID: <5252EAFF.8040700@redhat.com> Date: Mon, 07 Oct 2013 13:10:23 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 12/63] mm: numa: Do not migrate or account for hinting faults on the zero page References: <1381141781-10992-1-git-send-email-mgorman@suse.de> <1381141781-10992-13-git-send-email-mgorman@suse.de> In-Reply-To: <1381141781-10992-13-git-send-email-mgorman@suse.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Peter Zijlstra , Srikar Dronamraju , Ingo Molnar , Andrea Arcangeli , Johannes Weiner , Linux-MM , LKML On 10/07/2013 06:28 AM, Mel Gorman wrote: > The zero page is not replicated between nodes and is often shared between > processes. The data is read-only and likely to be cached in local CPUs > if heavily accessed meaning that the remote memory access cost is less > of a concern. This patch prevents trapping faults on the zero pages. For > tasks using the zero page this will reduce the number of PTE updates, > TLB flushes and hinting faults. > > [peterz@infradead.org: Correct use of is_huge_zero_page] > Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org