From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992972AbXDDP4m (ORCPT ); Wed, 4 Apr 2007 11:56:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992977AbXDDP4l (ORCPT ); Wed, 4 Apr 2007 11:56:41 -0400 Received: from mail.suse.de ([195.135.220.2]:59619 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992972AbXDDP4l (ORCPT ); Wed, 4 Apr 2007 11:56:41 -0400 From: Andi Kleen Organization: SUSE Linux Products GmbH, Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg) To: Jeremy Fitzhardinge Subject: Re: [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries Date: Wed, 4 Apr 2007 17:56:34 +0200 User-Agent: KMail/1.9.6 Cc: Andrew Morton , virtualization@lists.osdl.org, lkml , Ingo Molnar References: <20070402055652.610711908@goop.org> <200704041347.42822.ak@suse.de> <4613C828.2030604@goop.org> In-Reply-To: <4613C828.2030604@goop.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200704041756.35016.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 04 April 2007 17:45:44 Jeremy Fitzhardinge wrote: > Andi Kleen wrote: > > Why is there a difference for null syscall? I had assumed we patched all the > > fast path cases relevant there. Do you have an idea where it comes from? > > Sure. There's indirect calls for things like sti/cli/iret. It goes > back to native speed when you patch the real instructions inline. I was talking about the patched case. It seemed to be a little slower too, but in theory it shouldn't have been, no? -Andi