Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754206AbbKESzz (ORCPT ); Thu, 5 Nov 2015 13:55:55 -0500 Received: from www.linutronix.de ([62.245.132.108]:56892 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750800AbbKESzy (ORCPT ); Thu, 5 Nov 2015 13:55:54 -0500 Date: Thu, 5 Nov 2015 19:55:10 +0100 (CET) From: Thomas Gleixner To: Peter Zijlstra cc: Arjan van de Ven , Jacob Pan , LKML , Paul Turner , Len Brown , Srinivas Pandruvada , Tim Chen , Andi Kleen , Rafael Wysocki Subject: Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection In-Reply-To: <20151105165201.GJ3604@twins.programming.kicks-ass.net> Message-ID: References: <1446509428-5616-1-git-send-email-jacob.jun.pan@linux.intel.com> <1446509428-5616-4-git-send-email-jacob.jun.pan@linux.intel.com> <20151103133120.GD17308@twins.programming.kicks-ass.net> <20151103084501.289ec5d1@yairi> <20151105100922.GA3604@twins.programming.kicks-ass.net> <563B6642.2090803@linux.intel.com> <20151105143332.GQ17308@twins.programming.kicks-ass.net> <563B75B2.3040503@linux.intel.com> <20151105165201.GJ3604@twins.programming.kicks-ass.net> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1105 Lines: 29 On Thu, 5 Nov 2015, Peter Zijlstra wrote: > On Thu, Nov 05, 2015 at 07:28:50AM -0800, Arjan van de Ven wrote: > > well we have this as a driver right now that does not touch hot paths, > > but it seems you and tglx also hate that approach with a passion.... > > The current code is/was broken, but when I tried fixing it, tglx > objected to the entire approach yes... > > Thomas, no arm twisting can convince you to reconsider the fake idle > task approach? As long as the thing just calls mwait or whatever twisting might be successful, but I'm not going to change my mind on something calling into the idle related routines (timers, rcu, etc..) and violates all sensible assumptions we make in that code. It's complex enough already and we really do not need subtle wreckage by half baken and unreviewed drivers to add more complexity. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/