From: Jeremy Fitzhardinge Subject: Re: [PATCH 1/1] x86: fix text_poke Date: Fri, 25 Apr 2008 11:13:23 -0700 Message-ID: <48121F43.3060902@goop.org> References: <20080425.021301.193689806.davem@davemloft.net> <1209343883-7991-1-git-send-email-jirislaby@gmail.com> <20080425151931.GA25510@elte.hu> <20080425152650.GA894@elte.hu> <20080425154854.GC3265@one.firstfloor.org> <20080425161916.GD3265@one.firstfloor.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Andi Kleen , Ingo Molnar , Jiri Slaby , David Miller , zdenek.kabelac@gmail.com, rjw@sisk.pl, paulmck@linux.vnet.ibm.com, akpm@linux-foundation.org, linux-ext4@vger.kernel.org, herbert@gondor.apana.org.au, penberg@cs.helsinki.fi, clameter@sgi.com, linux-kernel@vger.kernel.org, Mathieu Desnoyers , pageexec@freemail.hu, "H. Peter Anvin" , Nick Piggin To: Linus Torvalds Return-path: Received: from gw.goop.org ([64.81.55.164]:41949 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762180AbYDYSN2 (ORCPT ); Fri, 25 Apr 2008 14:13:28 -0400 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: Linus Torvalds wrote: > With each invocation being thousands of instructions and a cross-CPU IPI > for the tlb flush, that kind of stuff adds up. We're likely talking real > fractions of a second, rather than milliseconds. Doesn't vunmap batch the cross-CPU tlb flushes to amortize the cost? Hm, no, it doesn't seem to. Oh, right, it was one of Nick's TBDs. J