From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 16 Aug 2012 21:42:37 +0200 (CEST) Received: from mx1.redhat.com ([209.132.183.28]:21363 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S1903480Ab2HPTmd (ORCPT ); Thu, 16 Aug 2012 21:42:33 +0200 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q7GJgB66010692 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 16 Aug 2012 15:42:12 -0400 Received: from random.random (ovpn-116-31.ams2.redhat.com [10.36.116.31]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id q7GJgBr3009809; Thu, 16 Aug 2012 15:42:11 -0400 Date: Thu, 16 Aug 2012 21:42:10 +0200 From: Andrea Arcangeli To: "Kirill A. Shutemov" Cc: "Kirill A. Shutemov" , linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Andi Kleen , Tim Chen , Alex Shi , Jan Beulich , Robert Richter , Andy Lutomirski , Andrew Morton , Johannes Weiner , Hugh Dickins , KAMEZAWA Hiroyuki , Mel Gorman , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org Subject: Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address Message-ID: <20120816194210.GR11188@redhat.com> References: <1345130154-9602-1-git-send-email-kirill.shutemov@linux.intel.com> <1345130154-9602-7-git-send-email-kirill.shutemov@linux.intel.com> <20120816161647.GM11188@redhat.com> <20120816164356.GA30106@shutemov.name> <20120816182944.GN11188@redhat.com> <20120816183725.GA30284@shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120816183725.GA30284@shutemov.name> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 X-archive-position: 34230 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: aarcange@redhat.com Precedence: bulk List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: linux-mips X-List-ID: linux-mips List-subscribe: List-owner: List-post: List-archive: X-list: linux-mips Return-Path: On Thu, Aug 16, 2012 at 09:37:25PM +0300, Kirill A. Shutemov wrote: > On Thu, Aug 16, 2012 at 08:29:44PM +0200, Andrea Arcangeli wrote: > > On Thu, Aug 16, 2012 at 07:43:56PM +0300, Kirill A. Shutemov wrote: > > > Hm.. I think with static_key we can avoid cache overhead here. I'll try. > > > > Could you elaborate on the static_key? Is it some sort of self > > modifying code? > > Runtime code patching. See Documentation/static-keys.txt. We can patch it > on sysctl. I guessed it had to be patching the code, thanks for the pointer. It looks a perfect fit for this one agreed. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrea Arcangeli Date: Thu, 16 Aug 2012 19:42:10 +0000 Subject: Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address Message-Id: <20120816194210.GR11188@redhat.com> List-Id: References: <1345130154-9602-1-git-send-email-kirill.shutemov@linux.intel.com> <1345130154-9602-7-git-send-email-kirill.shutemov@linux.intel.com> <20120816161647.GM11188@redhat.com> <20120816164356.GA30106@shutemov.name> <20120816182944.GN11188@redhat.com> <20120816183725.GA30284@shutemov.name> In-Reply-To: <20120816183725.GA30284@shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "Kirill A. Shutemov" Cc: "Kirill A. Shutemov" , linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Andi Kleen , Tim Chen , Alex Shi , Jan Beulich , Robert Richter , Andy Lutomirski , Andrew Morton , Johannes Weiner , Hugh Dickins , KAMEZAWA Hiroyuki , Mel Gorman , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org On Thu, Aug 16, 2012 at 09:37:25PM +0300, Kirill A. Shutemov wrote: > On Thu, Aug 16, 2012 at 08:29:44PM +0200, Andrea Arcangeli wrote: > > On Thu, Aug 16, 2012 at 07:43:56PM +0300, Kirill A. Shutemov wrote: > > > Hm.. I think with static_key we can avoid cache overhead here. I'll try. > > > > Could you elaborate on the static_key? Is it some sort of self > > modifying code? > > Runtime code patching. See Documentation/static-keys.txt. We can patch it > on sysctl. I guessed it had to be patching the code, thanks for the pointer. It looks a perfect fit for this one agreed. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by ozlabs.org (Postfix) with ESMTP id 511132C0096 for ; Fri, 17 Aug 2012 05:42:35 +1000 (EST) Date: Thu, 16 Aug 2012 21:42:10 +0200 From: Andrea Arcangeli To: "Kirill A. Shutemov" Subject: Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address Message-ID: <20120816194210.GR11188@redhat.com> References: <1345130154-9602-1-git-send-email-kirill.shutemov@linux.intel.com> <1345130154-9602-7-git-send-email-kirill.shutemov@linux.intel.com> <20120816161647.GM11188@redhat.com> <20120816164356.GA30106@shutemov.name> <20120816182944.GN11188@redhat.com> <20120816183725.GA30284@shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20120816183725.GA30284@shutemov.name> Cc: linux-mips@linux-mips.org, linux-sh@vger.kernel.org, Jan Beulich , linux-mm@kvack.org, "H. Peter Anvin" , sparclinux@vger.kernel.org, Andi Kleen , Robert Richter , x86@kernel.org, Hugh Dickins , Ingo Molnar , Mel Gorman , Alex Shi , Thomas Gleixner , KAMEZAWA Hiroyuki , Tim Chen , linux-kernel@vger.kernel.org, Andy Lutomirski , Johannes Weiner , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "Kirill A. Shutemov" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, Aug 16, 2012 at 09:37:25PM +0300, Kirill A. Shutemov wrote: > On Thu, Aug 16, 2012 at 08:29:44PM +0200, Andrea Arcangeli wrote: > > On Thu, Aug 16, 2012 at 07:43:56PM +0300, Kirill A. Shutemov wrote: > > > Hm.. I think with static_key we can avoid cache overhead here. I'll try. > > > > Could you elaborate on the static_key? Is it some sort of self > > modifying code? > > Runtime code patching. See Documentation/static-keys.txt. We can patch it > on sysctl. I guessed it had to be patching the code, thanks for the pointer. It looks a perfect fit for this one agreed. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx113.postini.com [74.125.245.113]) by kanga.kvack.org (Postfix) with SMTP id A2F846B006C for ; Thu, 16 Aug 2012 15:42:23 -0400 (EDT) Date: Thu, 16 Aug 2012 21:42:10 +0200 From: Andrea Arcangeli Subject: Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address Message-ID: <20120816194210.GR11188@redhat.com> References: <1345130154-9602-1-git-send-email-kirill.shutemov@linux.intel.com> <1345130154-9602-7-git-send-email-kirill.shutemov@linux.intel.com> <20120816161647.GM11188@redhat.com> <20120816164356.GA30106@shutemov.name> <20120816182944.GN11188@redhat.com> <20120816183725.GA30284@shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120816183725.GA30284@shutemov.name> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: "Kirill A. Shutemov" , linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Andi Kleen , Tim Chen , Alex Shi , Jan Beulich , Robert Richter , Andy Lutomirski , Andrew Morton , Johannes Weiner , Hugh Dickins , KAMEZAWA Hiroyuki , Mel Gorman , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org On Thu, Aug 16, 2012 at 09:37:25PM +0300, Kirill A. Shutemov wrote: > On Thu, Aug 16, 2012 at 08:29:44PM +0200, Andrea Arcangeli wrote: > > On Thu, Aug 16, 2012 at 07:43:56PM +0300, Kirill A. Shutemov wrote: > > > Hm.. I think with static_key we can avoid cache overhead here. I'll try. > > > > Could you elaborate on the static_key? Is it some sort of self > > modifying code? > > Runtime code patching. See Documentation/static-keys.txt. We can patch it > on sysctl. I guessed it had to be patching the code, thanks for the pointer. It looks a perfect fit for this one agreed. -- 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