From patchwork Mon Jul 25 13:34:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Morten Rasmussen X-Patchwork-Id: 72721 Delivered-To: patch@linaro.org Received: by 10.140.29.52 with SMTP id a49csp1150837qga; Mon, 25 Jul 2016 06:35:37 -0700 (PDT) X-Received: by 10.98.196.138 with SMTP id h10mr30004396pfk.60.1469453733720; Mon, 25 Jul 2016 06:35:33 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id w8si13171613paj.25.2016.07.25.06.35.33; Mon, 25 Jul 2016 06:35:33 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752964AbcGYNf1 (ORCPT + 29 others); Mon, 25 Jul 2016 09:35:27 -0400 Received: from foss.arm.com ([217.140.101.70]:33735 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751968AbcGYNfM (ORCPT ); Mon, 25 Jul 2016 09:35:12 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1BA1FBAD; Mon, 25 Jul 2016 06:36:26 -0700 (PDT) Received: from e105550-lin.cambridge.arm.com (e105550-lin.cambridge.arm.com [10.1.211.30]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id A7F1E3F21A; Mon, 25 Jul 2016 06:35:09 -0700 (PDT) From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: dietmar.eggemann@arm.com, yuyang.du@intel.com, vincent.guittot@linaro.org, mgalbraith@suse.de, sgurrappadi@nvidia.com, freedom.tan@mediatek.com, keita.kobayashi.ym@renesas.com, linux-kernel@vger.kernel.org, Morten Rasmussen Subject: [PATCH v3 07/13] sched: Enable SD_BALANCE_WAKE for asymmetric capacity systems Date: Mon, 25 Jul 2016 14:34:24 +0100 Message-Id: <1469453670-2660-8-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1469453670-2660-1-git-send-email-morten.rasmussen@arm.com> References: <1469453670-2660-1-git-send-email-morten.rasmussen@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A domain with the SD_ASYM_CPUCAPACITY flag set indicate that sched_groups at this level and below do not include cpus of all capacities available (e.g. group containing little-only or big-only cpus in big.LITTLE systems). It is therefore necessary to put in more effort in finding an appropriate cpu at task wake-up by enabling balancing at wake-up (SD_BALANCE_WAKE) on all lower (child) levels. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- kernel/sched/core.c | 7 +++++++ 1 file changed, 7 insertions(+) -- 1.9.1 diff --git a/kernel/sched/core.c b/kernel/sched/core.c index ec3f7aef321f..a0a74b2d9f41 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6414,6 +6414,13 @@ sd_init(struct sched_domain_topology_level *tl, * Convert topological properties into behaviour. */ + if (sd->flags & SD_ASYM_CPUCAPACITY) { + struct sched_domain *t = sd; + + for_each_lower_domain(t) + t->flags |= SD_BALANCE_WAKE; + } + if (sd->flags & SD_SHARE_CPUCAPACITY) { sd->flags |= SD_PREFER_SIBLING; sd->imbalance_pct = 110;