From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1947195AbcHRK63 (ORCPT ); Thu, 18 Aug 2016 06:58:29 -0400 Received: from terminus.zytor.com ([198.137.202.10]:58252 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753005AbcHRK6Y (ORCPT ); Thu, 18 Aug 2016 06:58:24 -0400 Date: Thu, 18 Aug 2016 03:57:50 -0700 From: tip-bot for Morten Rasmussen Message-ID: Cc: torvalds@linux-foundation.org, hpa@zytor.com, efault@gmx.de, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, morten.rasmussen@arm.com, linux-kernel@vger.kernel.org Reply-To: morten.rasmussen@arm.com, peterz@infradead.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, mingo@kernel.org, hpa@zytor.com, torvalds@linux-foundation.org, efault@gmx.de In-Reply-To: <1469453670-2660-8-git-send-email-morten.rasmussen@arm.com> References: <1469453670-2660-8-git-send-email-morten.rasmussen@arm.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/core: Enable SD_BALANCE_WAKE for asymmetric capacity systems Git-Commit-ID: 9ee1cda5ee25c7dd82acf25892e0d229e818f8c7 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 9ee1cda5ee25c7dd82acf25892e0d229e818f8c7 Gitweb: http://git.kernel.org/tip/9ee1cda5ee25c7dd82acf25892e0d229e818f8c7 Author: Morten Rasmussen AuthorDate: Mon, 25 Jul 2016 14:34:24 +0100 Committer: Ingo Molnar CommitDate: Thu, 18 Aug 2016 11:26:55 +0200 sched/core: Enable SD_BALANCE_WAKE for asymmetric capacity systems 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. Signed-off-by: Morten Rasmussen Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: dietmar.eggemann@arm.com Cc: freedom.tan@mediatek.com Cc: keita.kobayashi.ym@renesas.com Cc: mgalbraith@suse.de Cc: sgurrappadi@nvidia.com Cc: vincent.guittot@linaro.org Cc: yuyang.du@intel.com Link: http://lkml.kernel.org/r/1469453670-2660-8-git-send-email-morten.rasmussen@arm.com Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 5739465..4695df6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6444,6 +6444,13 @@ 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;