From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753462AbbDPPwt (ORCPT ); Thu, 16 Apr 2015 11:52:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38583 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752176AbbDPPwn (ORCPT ); Thu, 16 Apr 2015 11:52:43 -0400 Message-ID: <552FDABC.3060705@redhat.com> Date: Thu, 16 Apr 2015 11:52:28 -0400 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: Mel Gorman , Linux-MM CC: Hugh Dickins , Minchan Kim , Dave Hansen , Andi Kleen , LKML Subject: Re: [PATCH 2/4] mm: Send a single IPI to TLB flush multiple pages when unmapping References: <1429179766-26711-1-git-send-email-mgorman@suse.de> <1429179766-26711-3-git-send-email-mgorman@suse.de> In-Reply-To: <1429179766-26711-3-git-send-email-mgorman@suse.de> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/16/2015 06:22 AM, Mel Gorman wrote: > If a clean page is unmapped and not immediately flushed, the > architecture must guarantee that a write to that page from a CPU > with a cached TLB entry will trap a page fault. > > This is essentially what the kernel already depends on but the window is > much larger with this patch applied and is worth highlighting. > Signed-off-by: Mel Gorman Given the architectural guarantee ... Reviewed-by: Rik van Riel