From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756053AbaE3Ol6 (ORCPT ); Fri, 30 May 2014 10:41:58 -0400 Received: from mga02.intel.com ([134.134.136.20]:55149 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964959AbaE3Olz (ORCPT ); Fri, 30 May 2014 10:41:55 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.98,941,1392192000"; d="scan'208";a="548947206" From: Yuyang Du To: mingo@redhat.com, peterz@infradead.org, rafael.j.wysocki@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: arjan.van.de.ven@intel.com, len.brown@intel.com, alan.cox@intel.com, mark.gross@intel.com, pjt@google.com, bsegall@google.com, morten.rasmussen@arm.com, vincent.guittot@linaro.org, rajeev.d.muralidhar@intel.com, vishwesh.m.rudramuni@intel.com, nicole.chalhoub@intel.com, ajaya.durg@intel.com, harinarayanan.seshadri@intel.com, jacob.jun.pan@linux.intel.com, fengguang.wu@intel.com, yuyang.du@intel.com Subject: [RFC PATCH 14/16 v3] Intercept idle balancing Date: Fri, 30 May 2014 14:36:10 +0800 Message-Id: <1401431772-14320-15-git-send-email-yuyang.du@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> References: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We intercept load balancing to contain the load and load balancing in the consolidated CPUs according to our consolidating mechanism. In idle balancing, we do two things: 1) Skip pulling task to the idle non-consolidated CPUs. 2) In addition, for consolidated Idle CPU, we aggressively pull tasks from non-consolidated CPUs. Signed-off-by: Yuyang Du --- kernel/sched/fair.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1c9ac08..220773f 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6692,6 +6692,22 @@ static int idle_balance(struct rq *this_rq) update_blocked_averages(this_cpu); rcu_read_lock(); + + sd = top_flag_domain(this_cpu, SD_WORKLOAD_CONSOLIDATION); + if (sd) { + struct cpumask *nonshielded_cpus = __get_cpu_var(load_balance_mask); + + cpumask_copy(nonshielded_cpus, cpu_active_mask); + + /* + * if we encounter shielded cpus here, don't do balance on them + */ + wc_nonshielded_mask(this_cpu, sd, nonshielded_cpus); + if (!cpumask_test_cpu(this_cpu, nonshielded_cpus)) + goto unlock; + wc_unload(nonshielded_cpus, sd); + } + for_each_domain(this_cpu, sd) { unsigned long interval; int continue_balancing = 1; @@ -6724,6 +6740,7 @@ static int idle_balance(struct rq *this_rq) if (pulled_task) break; } +unlock: rcu_read_unlock(); raw_spin_lock(&this_rq->lock); -- 1.7.9.5