From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752683Ab0CRLMv (ORCPT ); Thu, 18 Mar 2010 07:12:51 -0400 Received: from gir.skynet.ie ([193.1.99.77]:36572 "EHLO gir.skynet.ie" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752381Ab0CRLMu (ORCPT ); Thu, 18 Mar 2010 07:12:50 -0400 Date: Thu, 18 Mar 2010 11:12:32 +0000 From: Mel Gorman To: Christoph Lameter Cc: KOSAKI Motohiro , Andrew Morton , Andrea Arcangeli , Adam Litke , Avi Kivity , David Rientjes , Rik van Riel , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating Message-ID: <20100318111231.GJ12388@csn.ul.ie> References: <1268412087-13536-1-git-send-email-mel@csn.ul.ie> <1268412087-13536-2-git-send-email-mel@csn.ul.ie> <20100317103434.4C8B.A69D9226@jp.fujitsu.com> <20100317114537.GF12388@csn.ul.ie> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 17, 2010 at 11:38:54AM -0500, Christoph Lameter wrote: > On Wed, 17 Mar 2010, Mel Gorman wrote: > > > This is true, but I don't think such a change belongs in this patch > > series. If this series gets merged, then it would be sensible to investigate > > if refcounting anon_vma is a good idea or would it be a bouncing write-shared > > cacheline mess. > > SLAB_DESTROY_BY_RCU is there to avoid the cooling of hot cachelines by > RCU. > Then even if we move to a full ref-count, it might still be a good idea to preserve the SLAB_DESTROY_BY_RCU. -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id BB2F06B00D7 for ; Thu, 18 Mar 2010 07:12:53 -0400 (EDT) Date: Thu, 18 Mar 2010 11:12:32 +0000 From: Mel Gorman Subject: Re: [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating Message-ID: <20100318111231.GJ12388@csn.ul.ie> References: <1268412087-13536-1-git-send-email-mel@csn.ul.ie> <1268412087-13536-2-git-send-email-mel@csn.ul.ie> <20100317103434.4C8B.A69D9226@jp.fujitsu.com> <20100317114537.GF12388@csn.ul.ie> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org To: Christoph Lameter Cc: KOSAKI Motohiro , Andrew Morton , Andrea Arcangeli , Adam Litke , Avi Kivity , David Rientjes , Rik van Riel , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wed, Mar 17, 2010 at 11:38:54AM -0500, Christoph Lameter wrote: > On Wed, 17 Mar 2010, Mel Gorman wrote: > > > This is true, but I don't think such a change belongs in this patch > > series. If this series gets merged, then it would be sensible to investigate > > if refcounting anon_vma is a good idea or would it be a bouncing write-shared > > cacheline mess. > > SLAB_DESTROY_BY_RCU is there to avoid the cooling of hot cachelines by > RCU. > Then even if we move to a full ref-count, it might still be a good idea to preserve the SLAB_DESTROY_BY_RCU. -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- 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