Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161772AbbBDSc5 (ORCPT ); Wed, 4 Feb 2015 13:32:57 -0500 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:41741 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967047AbbBDSb4 (ORCPT ); Wed, 4 Feb 2015 13:31:56 -0500 From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: vincent.guittot@linaro.org, dietmar.eggemann@arm.com, yuyang.du@intel.com, preeti@linux.vnet.ibm.com, mturquette@linaro.org, nico@linaro.org, rjw@rjwysocki.net, juri.lelli@arm.com, linux-kernel@vger.kernel.org Subject: [RFCv3 PATCH 47/48] sched: Enable active migration for cpus of lower capacity Date: Wed, 4 Feb 2015 18:31:24 +0000 Message-Id: <1423074685-6336-48-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1423074685-6336-1-git-send-email-morten.rasmussen@arm.com> References: <1423074685-6336-1-git-send-email-morten.rasmussen@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1156 Lines: 38 Add an extra criteria to need_active_balance() to kick off active load balance if the source cpu is overutilized and has lower capacity than the destination cpus. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- kernel/sched/fair.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 92fd1d8..1c248f8 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7379,6 +7379,13 @@ static int need_active_balance(struct lb_env *env) return 1; } + if ((capacity_of(env->src_cpu) < capacity_of(env->dst_cpu)) && + env->src_rq->cfs.h_nr_running == 1 && + cpu_overutilized(env->src_cpu, env->sd) && + !cpu_overutilized(env->dst_cpu, env->sd)) { + return 1; + } + return unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2); } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/