From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757037AbdKGTFN (ORCPT ); Tue, 7 Nov 2017 14:05:13 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:56947 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753052AbdKGTFL (ORCPT ); Tue, 7 Nov 2017 14:05:11 -0500 Date: Tue, 7 Nov 2017 20:05:05 +0100 From: Peter Zijlstra To: Patrick Bellasi Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Morten Rasmussen , Dietmar Eggemann , Chris Redpath Subject: Re: [PATCH] sched: fix sched_feat for !SCHED_DEBUG builds Message-ID: <20171107190505.GP3165@worktop.lehotels.local> References: <20171107160658.4839-1-patrick.bellasi@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20171107160658.4839-1-patrick.bellasi@arm.com> User-Agent: Mutt/1.5.22.1 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 07, 2017 at 04:06:58PM +0000, Patrick Bellasi wrote: > For this mechanism to properly work it's required for the compiler to > have full access, from each translation unit, to whatever is the value > defined by the sched_feat macro. > Statistics on the reported completion time: > > count mean std min 99% max > v4.14-rc8 30.0 15.7831 0.176032 15.442 16.01226 16.014 > v4.14-rc8+patch 30.0 15.5033 0.189681 15.232 15.93938 15.962 > > show a 1.8% speedup on average completion time and 0.5% speedup in the > 99 percentile. > Ack