From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030206AbXCHIO6 (ORCPT ); Thu, 8 Mar 2007 03:14:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030218AbXCHIO6 (ORCPT ); Thu, 8 Mar 2007 03:14:58 -0500 Received: from mta2.cl.cam.ac.uk ([128.232.0.14]:44066 "EHLO mta2.cl.cam.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030206AbXCHIO5 (ORCPT ); Thu, 8 Mar 2007 03:14:57 -0500 User-Agent: Microsoft-Entourage/11.3.3.061214 Date: Thu, 08 Mar 2007 08:15:15 +0000 Subject: Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree From: Keir Fraser To: Ingo Molnar , Jeremy Fitzhardinge CC: Virtualization Mailing List , john stultz , LKML , , Message-ID: Thread-Topic: + stupid-hack-to-make-mainline-build.patch added to -mm tree Thread-Index: AcdhWeZ4JPOPLs1NEduPKQAWy6hiGQ== In-Reply-To: <20070308080131.GB9295@elte.hu> Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 8/3/07 08:01, "Ingo Molnar" wrote: > you are obsessed with avoiding a hypercall, but why? Granted it's slow > especially on things like SVN/VMX, but it's not fundamentally slow. We > definitely do not want to design our whole APIs and abstractions around > the temporary notion that 'hypercalls are slow'. I'd expect hypercalls > to be put into silicon just as much as SYSENTER was put into silicon. If syscalls are already so fast, why does Linux have vgettimeofday()? -- Keir