From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752272AbaIJOTR (ORCPT ); Wed, 10 Sep 2014 10:19:17 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:33153 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751331AbaIJOTP (ORCPT ); Wed, 10 Sep 2014 10:19:15 -0400 Date: Wed, 10 Sep 2014 16:19:05 +0200 From: Peter Zijlstra To: Vincent Guittot Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, preeti@linux.vnet.ibm.com, linux@arm.linux.org.uk, linux-arm-kernel@lists.infradead.org, riel@redhat.com, Morten.Rasmussen@arm.com, efault@gmx.de, nicolas.pitre@linaro.org, linaro-kernel@lists.linaro.org, daniel.lezcano@linaro.org, dietmar.eggemann@arm.com Subject: Re: [PATCH v5 07/12] sched: test the cpu's capacity in wake affine Message-ID: <20140910141905.GR3190@worktop.ger.corp.intel.com> References: <1409051215-16788-1-git-send-email-vincent.guittot@linaro.org> <1409051215-16788-8-git-send-email-vincent.guittot@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1409051215-16788-8-git-send-email-vincent.guittot@linaro.org> 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, Aug 26, 2014 at 01:06:50PM +0200, Vincent Guittot wrote: > Currently the task always wakes affine on this_cpu if the latter is idle. > Before waking up the task on this_cpu, we check that this_cpu capacity is not > significantly reduced because of RT tasks or irq activity. > > Use case where the number of irq and/or the time spent under irq is important > will take benefit of this because the task that is woken up by irq or softirq > will not use the same CPU than irq (and softirq) but a idle one. > > Signed-off-by: Vincent Guittot Rik, you've been 'fighting' wake_affine, any objections? From mboxrd@z Thu Jan 1 00:00:00 1970 From: peterz@infradead.org (Peter Zijlstra) Date: Wed, 10 Sep 2014 16:19:05 +0200 Subject: [PATCH v5 07/12] sched: test the cpu's capacity in wake affine In-Reply-To: <1409051215-16788-8-git-send-email-vincent.guittot@linaro.org> References: <1409051215-16788-1-git-send-email-vincent.guittot@linaro.org> <1409051215-16788-8-git-send-email-vincent.guittot@linaro.org> Message-ID: <20140910141905.GR3190@worktop.ger.corp.intel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Aug 26, 2014 at 01:06:50PM +0200, Vincent Guittot wrote: > Currently the task always wakes affine on this_cpu if the latter is idle. > Before waking up the task on this_cpu, we check that this_cpu capacity is not > significantly reduced because of RT tasks or irq activity. > > Use case where the number of irq and/or the time spent under irq is important > will take benefit of this because the task that is woken up by irq or softirq > will not use the same CPU than irq (and softirq) but a idle one. > > Signed-off-by: Vincent Guittot Rik, you've been 'fighting' wake_affine, any objections?