From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759055Ab2EDACc (ORCPT ); Thu, 3 May 2012 20:02:32 -0400 Received: from mga11.intel.com ([192.55.52.93]:4971 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756946Ab2EDACb (ORCPT ); Thu, 3 May 2012 20:02:31 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="161690213" Subject: Re: [RFC][PATCH 1/5] sched, fair: Let minimally loaded cpu balance the group From: Suresh Siddha Reply-To: Suresh Siddha To: Srivatsa Vaddagiri Cc: Peter Zijlstra , mingo@kernel.org, pjt@google.com, efault@gmx.de, linux-kernel@vger.kernel.org Date: Thu, 03 May 2012 17:05:45 -0700 In-Reply-To: <20120502103453.GB22740@linux.vnet.ibm.com> References: <20120501181430.007891123@chello.nl> <20120501182610.745844312@chello.nl> <20120502102541.GA22740@linux.vnet.ibm.com> <1335954690.13683.178.camel@twins> <20120502103453.GB22740@linux.vnet.ibm.com> Organization: Intel Corp Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.0.3 (3.0.3-1.fc15) Content-Transfer-Encoding: 7bit Message-ID: <1336089945.28674.460.camel@sbsiddha-desk.sc.intel.com> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2012-05-02 at 16:04 +0530, Srivatsa Vaddagiri wrote: > * Peter Zijlstra [2012-05-02 12:31:30]: > > > > IOW : > > > > > > balance_load = 0 iff idle_cpu(i) ?? > > > > I think so, even for !0 load_idx, load will only reach zero when we're > > idle, just takes longer. > > Right ...so should we force it to select a idle_cpu by having > balance_load = 0 for a idle cpu (ignoring what target_load(i, load_idx) > told us as its load? I think Peter is trying to find the leastly loaded among idle cpu's (in other words the longest idle cpu ;) should be ok, isn't it? thanks, suresh