From patchwork Wed Jun 22 17:03:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Morten Rasmussen X-Patchwork-Id: 70677 Delivered-To: patch@linaro.org Received: by 10.140.28.4 with SMTP id 4csp16132qgy; Wed, 22 Jun 2016 10:06:00 -0700 (PDT) X-Received: by 10.36.16.133 with SMTP id 127mr16276759ity.12.1466615160104; Wed, 22 Jun 2016 10:06:00 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id hh7si901255pac.33.2016.06.22.10.05.59; Wed, 22 Jun 2016 10:06:00 -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 S1753065AbcFVRFW (ORCPT + 30 others); Wed, 22 Jun 2016 13:05:22 -0400 Received: from foss.arm.com ([217.140.101.70]:49310 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753143AbcFVRCn (ORCPT ); Wed, 22 Jun 2016 13:02:43 -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 C3D13BB0; Wed, 22 Jun 2016 10:03:24 -0700 (PDT) Received: from e105550-lin.cambridge.arm.com (e105550-lin.cambridge.arm.com [10.1.207.130]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 469593F246; Wed, 22 Jun 2016 10:02:36 -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, linux-kernel@vger.kernel.org, Morten Rasmussen Subject: [PATCH v2 05/13] sched: Enable SD_BALANCE_WAKE for asymmetric capacity systems Date: Wed, 22 Jun 2016 18:03:16 +0100 Message-Id: <1466615004-3503-6-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1466615004-3503-1-git-send-email-morten.rasmussen@arm.com> References: <1466615004-3503-1-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 Systems with the SD_ASYM_CPUCAPACITY flag set indicate that sched_groups at this level or 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). cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- kernel/sched/core.c | 3 +++ 1 file changed, 3 insertions(+) -- 1.9.1 diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 351609279341..fe39118ffdfb 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6397,6 +6397,9 @@ sd_init(struct sched_domain_topology_level *tl, int cpu) * Convert topological properties into behaviour. */ + if (sd->flags & SD_ASYM_CPUCAPACITY) + sd->flags |= SD_BALANCE_WAKE; + if (sd->flags & SD_SHARE_CPUCAPACITY) { sd->flags |= SD_PREFER_SIBLING; sd->imbalance_pct = 110;