Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753099AbcKPO22 (ORCPT ); Wed, 16 Nov 2016 09:28:28 -0500 Received: from merlin.infradead.org ([205.233.59.134]:40384 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932540AbcKPO2Z (ORCPT ); Wed, 16 Nov 2016 09:28:25 -0500 Date: Wed, 16 Nov 2016 15:28:21 +0100 From: Peter Zijlstra To: Steven Rostedt Cc: Christoph Lameter , Daniel Vacek , Daniel Bristot de Oliveira , Tommaso Cucinotta , LKML , linux-rt-users , Ingo Molnar Subject: Re: your mail Message-ID: <20161116142821.GZ3117@twins.programming.kicks-ass.net> References: <20161116104014.GQ3142@twins.programming.kicks-ass.net> <20161116092543.663e1d2c@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161116092543.663e1d2c@gandalf.local.home> 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 Content-Length: 786 Lines: 19 On Wed, Nov 16, 2016 at 09:25:43AM -0500, Steven Rostedt wrote: > On Wed, 16 Nov 2016 11:40:14 +0100 > Peter Zijlstra wrote: > > > > On top of which, the implementation had issues; now I know you're the > > blinder kind of person that disregards everything not in his immediate > > interest, but if you'd looked at the patch you'd have seen he'd added > > code the idle entry path, which will slow down every single to-idle > > transition. > > Isn't to-idle a bit bloated anyway? Or has that been fixed. I know > there was some issues with idle_balance() which can add latency to > wakeups. idle_balance() is also in the to-idle path. > Yes it is too heavy as is, but just stacking more crap in just because its already expensive seems to wrong way around.