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From:   Morten Rasmussen <morten.rasmussen@arm.com>
To:     peterz@infradead.org, mingo@redhat.com
Cc:     valentin.schneider@arm.com, dietmar.eggemann@arm.com,
        vincent.guittot@linaro.org, gaku.inami.xh@renesas.com,
        linux-kernel@vger.kernel.org,
        Morten Rasmussen <morten.rasmussen@arm.com>
Subject: [PATCHv4 11/12] sched/core: Disable SD_ASYM_CPUCAPACITY for root_domains without asymmetry
Date:   Wed,  4 Jul 2018 11:17:49 +0100
Message-Id: <1530699470-29808-12-git-send-email-morten.rasmussen@arm.com>
In-Reply-To: <1530699470-29808-1-git-send-email-morten.rasmussen@arm.com>
References: <1530699470-29808-1-git-send-email-morten.rasmussen@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
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When hotplugging cpus out or creating exclusive cpusets (disabling
sched_load_balance) systems which were asymmetric at boot might become
symmetric. In this case leaving the flag set might lead to suboptimal
scheduling decisions.

The arch-code proving the flag doesn't have visibility of the cpuset
configuration so it must either be told by passing a cpumask or the
generic topology code has to verify if the flag should still be set
when taking the actual sched_domain_span() into account. This patch
implements the latter approach.

We need to detect capacity based on calling arch_scale_cpu_capacity()
directly as rq->cpu_capacity_orig hasn't been set yet early in the boot
process.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>

Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
---
 kernel/sched/topology.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 71330e0e41db..29c186961345 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1160,6 +1160,26 @@ sd_init(struct sched_domain_topology_level *tl,
 	sd_id = cpumask_first(sched_domain_span(sd));
 
 	/*
+	 * Check if cpu_map eclipses cpu capacity asymmetry.
+	 */
+
+	if (sd->flags & SD_ASYM_CPUCAPACITY) {
+		int i;
+		bool disable = true;
+		long capacity = arch_scale_cpu_capacity(NULL, sd_id);
+
+		for_each_cpu(i, sched_domain_span(sd)) {
+			if (capacity != arch_scale_cpu_capacity(NULL, i)) {
+				disable = false;
+				break;
+			}
+		}
+
+		if (disable)
+			sd->flags &= ~SD_ASYM_CPUCAPACITY;
+	}
+
+	/*
 	 * Convert topological properties into behaviour.
 	 */
 
-- 
2.7.4