From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754698Ab1I1OvA (ORCPT ); Wed, 28 Sep 2011 10:51:00 -0400 Received: from e35.co.us.ibm.com ([32.97.110.153]:57327 "EHLO e35.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754276Ab1I1Ou7 (ORCPT ); Wed, 28 Sep 2011 10:50:59 -0400 Date: Wed, 28 Sep 2011 19:57:36 +0530 From: Srivatsa Vaddagiri To: Venki Pallipadi Cc: Peter Zijlstra , Paul Turner , Ingo Molnar , Vaidyanathan Srinivasan , Kamalesh Babulal , linux-kernel@vger.kernel.org Subject: Re: [PATCH v1] sched: fix nohz idle load balancer issues Message-ID: <20110928142735.GG8593@linux.vnet.ibm.com> Reply-To: Srivatsa Vaddagiri References: <20110926115049.GA22604@linux.vnet.ibm.com> <20110928043427.GI4357@linux.vnet.ibm.com> <20110928141701.GF8593@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20110928141701.GF8593@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Srivatsa Vaddagiri [2011-09-28 19:47:01]: > * Srivatsa Vaddagiri [2011-09-28 10:04:27]: > > > > Especially with higher number of logical CPUs. Likely cleaner way is to clear > > > first_pick, second_pick on idle instead of clearing on tickless. > > > > I think I tried that (cleared first/second_pick_cpu in > > nohz_kick_needed() upon idle) but didn't get the best results. which perhaps was beause I was relying on idle_at_tick (which can be stale information as Suresh pointed out). - vatsa