From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964923AbaE3Olr (ORCPT ); Fri, 30 May 2014 10:41:47 -0400 Received: from mga02.intel.com ([134.134.136.20]:55120 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933564AbaE3Olo (ORCPT ); Fri, 30 May 2014 10:41:44 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.98,941,1392192000"; d="scan'208";a="548947148" 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 12/16 v3] Bias select wakee than waker in WAKE_AFFINE Date: Fri, 30 May 2014 14:36:08 +0800 Message-Id: <1401431772-14320-13-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 In WAKE_AFFINE, we do not simply select idle, but bias wakee than waker if the cc of the wakee and waker (in this order) is capable of handling the wakee task Signed-off-by: Yuyang Du --- kernel/sched/fair.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0c188df..d40ec9e 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4370,7 +4370,18 @@ static int select_idle_sibling(struct task_struct *p, int target) struct sched_group *sg; int i = task_cpu(p); - if (idle_cpu(target)) + /* + * we do not select idle, if the cc of the wakee and + * waker (in this order) is capable of handling the wakee task + */ + if (sysctl_sched_cc_wakeup_threshold) { + if (idle_cpu(i) || cpu_cc_capable(i)) + return i; + + if (i != target && (idle_cpu(target) || cpu_cc_capable(target))) + return target; + } + else if (idle_cpu(target)) return target; /* -- 1.7.9.5