From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752962AbcGYNf1 (ORCPT ); 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 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 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(+) 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; -- 1.9.1