From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-we0-f180.google.com (mail-we0-f180.google.com [74.125.82.180]) by kanga.kvack.org (Postfix) with ESMTP id DC93F6B00A0 for ; Mon, 9 Dec 2013 09:22:12 -0500 (EST) Received: by mail-we0-f180.google.com with SMTP id t61so3462525wes.39 for ; Mon, 09 Dec 2013 06:22:12 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTP id i10si4636156wjz.160.2013.12.09.06.22.11 for ; Mon, 09 Dec 2013 06:22:11 -0800 (PST) Message-ID: <52A5D20F.4010702@redhat.com> Date: Mon, 09 Dec 2013 09:22:07 -0500 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 04/18] mm: numa: Do not clear PMD during PTE update scan References: <1386572952-1191-1-git-send-email-mgorman@suse.de> <1386572952-1191-5-git-send-email-mgorman@suse.de> In-Reply-To: <1386572952-1191-5-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: Andrew Morton , Alex Thorlton , Linux-MM , LKML On 12/09/2013 02:08 AM, Mel Gorman wrote: > If the PMD is flushed then a parallel fault in handle_mm_fault() will enter > the pmd_none and do_huge_pmd_anonymous_page() path where it'll attempt > to insert a huge zero page. This is wasteful so the patch avoids clearing > the PMD when setting pmd_numa. > > Cc: stable@vger.kernel.org > 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761118Ab3LIOWS (ORCPT ); Mon, 9 Dec 2013 09:22:18 -0500 Received: from mx1.redhat.com ([209.132.183.28]:21225 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753514Ab3LIOWR (ORCPT ); Mon, 9 Dec 2013 09:22:17 -0500 Message-ID: <52A5D20F.4010702@redhat.com> Date: Mon, 09 Dec 2013 09:22:07 -0500 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: Andrew Morton , Alex Thorlton , Linux-MM , LKML Subject: Re: [PATCH 04/18] mm: numa: Do not clear PMD during PTE update scan References: <1386572952-1191-1-git-send-email-mgorman@suse.de> <1386572952-1191-5-git-send-email-mgorman@suse.de> In-Reply-To: <1386572952-1191-5-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 12/09/2013 02:08 AM, Mel Gorman wrote: > If the PMD is flushed then a parallel fault in handle_mm_fault() will enter > the pmd_none and do_huge_pmd_anonymous_page() path where it'll attempt > to insert a huge zero page. This is wasteful so the patch avoids clearing > the PMD when setting pmd_numa. > > Cc: stable@vger.kernel.org > Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel -- All rights reversed