From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753058AbcFVRFW (ORCPT ); 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 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 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(+) 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; -- 1.9.1