From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756887AbYCEFNX (ORCPT ); Wed, 5 Mar 2008 00:13:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751518AbYCEFNM (ORCPT ); Wed, 5 Mar 2008 00:13:12 -0500 Received: from bzq-179-150-194.static.bezeqint.net ([212.179.150.194]:53838 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750931AbYCEFNL (ORCPT ); Wed, 5 Mar 2008 00:13:11 -0500 Message-ID: <47CE2B23.6010505@qumranet.com> Date: Wed, 05 Mar 2008 07:09:55 +0200 From: Avi Kivity User-Agent: Thunderbird 2.0.0.12 (X11/20080226) MIME-Version: 1.0 To: Peter Zijlstra CC: Christoph Lameter , Andrea Arcangeli , Jack Steiner , Nick Piggin , akpm@linux-foundation.org, Robin Holt , kvm-devel@lists.sourceforge.net, general@lists.openfabrics.org, Steve Wise , Roland Dreier , Kanoj Sarcar , linux-kernel@vger.kernel.org, linux-mm@kvack.org, daniel.blueman@quadrics.com Subject: Re: [RFC] Notifier for Externally Mapped Memory (EMM) References: <20080221144023.GC9427@v2.random> <20080221161028.GA14220@sgi.com> <20080227192610.GF28483@v2.random> <20080302155457.GK8091@v2.random> <20080303213707.GA8091@v2.random> <20080303220502.GA5301@v2.random> <47CC9B57.5050402@qumranet.com> <20080304133020.GC5301@v2.random> <20080304222030.GB8951@v2.random> <1204670529.6241.52.camel@lappy> In-Reply-To: <1204670529.6241.52.camel@lappy> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0rc1 (firebolt.argo.co.il [0.0.0.0]); Wed, 05 Mar 2008 07:09:55 +0200 (IST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter Zijlstra wrote: > On Tue, 2008-03-04 at 14:35 -0800, Christoph Lameter wrote: > > >> RCU means that the callbacks occur in an atomic context. >> > > Not really, if it requires moving the VM locks to sleepable locks under > a .config option, I think its also fair to require PREEMPT_RCU. > > OTOH, if you want to unconditionally move the VM locks to sleepable > locks you have a point. > Isn't that out of the question for .25? I really wish we can get the atomic variant in now, and add on sleepability in .26, updating users if necessary. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [ofa-general] Re: [RFC] Notifier for Externally Mapped Memory (EMM) Date: Wed, 05 Mar 2008 07:09:55 +0200 Message-ID: <47CE2B23.6010505@qumranet.com> References: <20080221144023.GC9427@v2.random> <20080221161028.GA14220@sgi.com> <20080227192610.GF28483@v2.random> <20080302155457.GK8091@v2.random> <20080303213707.GA8091@v2.random> <20080303220502.GA5301@v2.random> <47CC9B57.5050402@qumranet.com> <20080304133020.GC5301@v2.random> <20080304222030.GB8951@v2.random> <1204670529.6241.52.camel@lappy> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Nick Piggin , Andrea Arcangeli , kvm-devel@lists.sourceforge.net, Kanoj Sarcar , Roland Dreier , Jack Steiner , linux-kernel@vger.kernel.org, linux-mm@kvack.org, daniel.blueman@quadrics.com, Robin Holt , general@lists.openfabrics.org, akpm@linux-foundation.org, Christoph Lameter To: Peter Zijlstra Return-path: In-Reply-To: <1204670529.6241.52.camel@lappy> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: general-bounces@lists.openfabrics.org Errors-To: general-bounces@lists.openfabrics.org List-Id: kvm.vger.kernel.org Peter Zijlstra wrote: > On Tue, 2008-03-04 at 14:35 -0800, Christoph Lameter wrote: > > >> RCU means that the callbacks occur in an atomic context. >> > > Not really, if it requires moving the VM locks to sleepable locks under > a .config option, I think its also fair to require PREEMPT_RCU. > > OTOH, if you want to unconditionally move the VM locks to sleepable > locks you have a point. > Isn't that out of the question for .25? I really wish we can get the atomic variant in now, and add on sleepability in .26, updating users if necessary. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <47CE2B23.6010505@qumranet.com> Date: Wed, 05 Mar 2008 07:09:55 +0200 From: Avi Kivity MIME-Version: 1.0 Subject: Re: [RFC] Notifier for Externally Mapped Memory (EMM) References: <20080221144023.GC9427@v2.random> <20080221161028.GA14220@sgi.com> <20080227192610.GF28483@v2.random> <20080302155457.GK8091@v2.random> <20080303213707.GA8091@v2.random> <20080303220502.GA5301@v2.random> <47CC9B57.5050402@qumranet.com> <20080304133020.GC5301@v2.random> <20080304222030.GB8951@v2.random> <1204670529.6241.52.camel@lappy> In-Reply-To: <1204670529.6241.52.camel@lappy> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Peter Zijlstra Cc: Christoph Lameter , Andrea Arcangeli , Jack Steiner , Nick Piggin , akpm@linux-foundation.org, Robin Holt , kvm-devel@lists.sourceforge.net, general@lists.openfabrics.org, Steve Wise , Roland Dreier , Kanoj Sarcar , linux-kernel@vger.kernel.org, linux-mm@kvack.org, daniel.blueman@quadrics.com List-ID: Peter Zijlstra wrote: > On Tue, 2008-03-04 at 14:35 -0800, Christoph Lameter wrote: > > >> RCU means that the callbacks occur in an atomic context. >> > > Not really, if it requires moving the VM locks to sleepable locks under > a .config option, I think its also fair to require PREEMPT_RCU. > > OTOH, if you want to unconditionally move the VM locks to sleepable > locks you have a point. > Isn't that out of the question for .25? I really wish we can get the atomic variant in now, and add on sleepability in .26, updating users if necessary. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- 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