From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752415AbcCKM2W (ORCPT ); Fri, 11 Mar 2016 07:28:22 -0500 Received: from mail-wm0-f50.google.com ([74.125.82.50]:37016 "EHLO mail-wm0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751660AbcCKM2O (ORCPT ); Fri, 11 Mar 2016 07:28:14 -0500 Date: Fri, 11 Mar 2016 13:28:10 +0100 From: Pali =?utf-8?B?Um9ow6Fy?= To: Peter Zijlstra Cc: Juergen Gross , linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, david.vrabel@citrix.com, mingo@redhat.com, Douglas_Warzecha@dell.com, jdelvare@suse.com, linux@roeck-us.net, tglx@linutronix.de, hpa@zytor.com, x86@kernel.org Subject: Re: [PATCH 0/6] Support calling functions on dedicated physical cpu Message-ID: <20160311122810.GE8413@pali> References: <1457697574-6710-1-git-send-email-jgross@suse.com> <20160311122514.GA6344@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20160311122514.GA6344@twins.programming.kicks-ass.net> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday 11 March 2016 13:25:14 Peter Zijlstra wrote: > On Fri, Mar 11, 2016 at 12:59:28PM +0100, Juergen Gross wrote: > > Some hardware (e.g. Dell Studio laptops) require special functions to > > be called on physical cpu 0 in order to avoid occasional hangs. When > > running as dom0 under Xen this could be achieved only via special boot > > parameters (vcpu pinning) limiting the hypervisor in it's scheduling > > decisions. > > So instead of telling Dell to get their act together and fix their damn > firmware, we're going to add the most horrid gunk to the kernel? How > does that make sense? Hi Peter! That problem is for old laptops and I doubt that Dell would fix and distribute patches for 5-15 years old laptops... -- Pali Rohár pali.rohar@gmail.com