From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753764AbcBATXm (ORCPT ); Mon, 1 Feb 2016 14:23:42 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50102 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753303AbcBATXl (ORCPT ); Mon, 1 Feb 2016 14:23:41 -0500 Subject: Re: [PATCH 4/4] sched,time: only call account_{user,sys,guest,idle}_time once a jiffy To: Peter Zijlstra References: <1454292751-23472-1-git-send-email-riel@redhat.com> <1454292751-23472-5-git-send-email-riel@redhat.com> <20160201092943.GN6357@twins.programming.kicks-ass.net> Cc: linux-kernel@vger.kernel.org, fweisbec@gmail.com, tglx@linutronix.de, mingo@kernel.org, luto@amacapital.net, clark@redhat.com From: Rik van Riel Message-ID: <56AFB0BB.8060301@redhat.com> Date: Mon, 1 Feb 2016 14:23:39 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <20160201092943.GN6357@twins.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/01/2016 04:29 AM, Peter Zijlstra wrote: > On Sun, Jan 31, 2016 at 09:12:31PM -0500, riel@redhat.com wrote: >> Run times for the microbenchmark: >> >> 4.4 3.8 seconds >> 4.5-rc1 3.7 seconds >> 4.5-rc1 + first patch 3.3 seconds >> 4.5-rc1 + first 3 patches 3.1 seconds >> 4.5-rc1 + all patches 2.3 seconds > > Would be good to compare that also to a !NOHZ_FULL bloated path. On a non-nohz_full, non-housekeeping CPU, I see 1.86 seconds run time, or about 20% faster than on a nohz_full CPU with all patches applied. -- All rights reversed