From: Linus Torvalds Subject: Re: [PATCH 1/1] x86: fix text_poke Date: Fri, 25 Apr 2008 11:09:23 -0700 (PDT) Message-ID: References: <20080425152650.GA894@elte.hu> <20080425154854.GC3265@one.firstfloor.org> <20080425162215.GA16273@elte.hu> <20080425164509.GB19962@elte.hu> <20080425170237.GA24472@elte.hu> <20080425175333.GA25276@elte.hu> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Andi Kleen , 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" , Jeremy Fitzhardinge To: Ingo Molnar Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:41283 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932449AbYDYSLu (ORCPT ); Fri, 25 Apr 2008 14:11:50 -0400 In-Reply-To: <20080425175333.GA25276@elte.hu> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri, 25 Apr 2008, Ingo Molnar wrote: > > no strong feeling either way - but i dont think there's any cross-CPU > TLB flush done in this case within vmap()/vunmap(). Why? Because when > alternative_instructions() runs then we have just a single CPU in > cpu_online_map. Ok, fair enough. Without the IPI, I don't think there's a big deal. And you have the numbers to prove it. Consider me convinced. Linus