From patchwork Fri May 30 06:36:08 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yuyang Du X-Patchwork-Id: 4271271 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7E419BEEA7 for ; Fri, 30 May 2014 14:43:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C43FC20384 for ; Fri, 30 May 2014 14:43:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C8C920396 for ; Fri, 30 May 2014 14:43:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933595AbaE3Olq (ORCPT ); Fri, 30 May 2014 10:41:46 -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 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 30 May 2014 07:41:44 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.98,941,1392192000"; d="scan'208";a="548947148" Received: from dalvikqa005-desktop.bj.intel.com ([10.238.151.105]) by orsmga002.jf.intel.com with ESMTP; 30 May 2014 07:41:38 -0700 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-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.0 required=5.0 tests=BAYES_00, DATE_IN_PAST_06_12, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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; /*