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From: douglas.raillard@arm.com
To: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org, mingo@redhat.com, peterz@infradead.org,
	quentin.perret@arm.com, douglas.raillard@arm.com,
	patrick.bellasi@arm.com, dietmar.eggemann@arm.com
Subject: [RFC PATCH 5/7] sched/cpufreq: sugov_cpu_is_busy for shared policy
Date: Wed,  8 May 2019 18:42:59 +0100
Message-ID: <20190508174301.4828-6-douglas.raillard@arm.com> (raw)
Message-ID: <20190508174259.KZnAeXZBA6BW-P-JqzzuWcIi1-IlKDrTAlOlSPhYynQ@z> (raw)
In-Reply-To: <20190508174301.4828-1-douglas.raillard@arm.com>

From: Douglas RAILLARD <douglas.raillard@arm.com>

Allow using sugov_cpu_is_busy() from sugov_update_shared(). This means
that the heuristic needs to return stable results across multiple calls
for a given CPU, even if there has been no utilization change since last
call.

sugov_cpu_is_busy() currently both checks business status and updates
the counters, so let's decouple the two actions.

Signed-off-by: Douglas RAILLARD <douglas.raillard@arm.com>
---
 kernel/sched/cpufreq_schedutil.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index a52c66559321..a12b7e5bc028 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -178,12 +178,17 @@ static bool sugov_cpu_is_busy(struct sugov_cpu *sg_cpu)
 {
 	unsigned long idle_calls = tick_nohz_get_idle_calls_cpu(sg_cpu->cpu);
 	bool ret = idle_calls == sg_cpu->saved_idle_calls;
+	return ret;
+}
 
+static void sugov_cpu_is_busy_update(struct sugov_cpu *sg_cpu)
+{
+	unsigned long idle_calls = tick_nohz_get_idle_calls_cpu(sg_cpu->cpu);
 	sg_cpu->saved_idle_calls = idle_calls;
-	return ret;
 }
 #else
 static inline bool sugov_cpu_is_busy(struct sugov_cpu *sg_cpu) { return false; }
+static void sugov_cpu_is_busy_update(struct sugov_cpu *sg_cpu) {}
 #endif /* CONFIG_NO_HZ_COMMON */
 
 /**
@@ -503,6 +508,7 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
 		return;
 
 	busy = sugov_cpu_is_busy(sg_cpu);
+	sugov_cpu_is_busy_update(sg_cpu);
 
 	util = sugov_get_util(sg_cpu);
 	max = sg_cpu->max;
-- 
2.21.0


  parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-08 17:42 [RFC PATCH 0/7] sched/cpufreq: Make schedutil energy aware douglas.raillard
2019-05-08 17:42 ` douglas.raillard
2019-05-08 17:42 ` [RFC PATCH 1/7] PM: Introduce em_pd_get_higher_freq() douglas.raillard
2019-05-08 17:42   ` douglas.raillard
2019-05-16 12:42   ` Patrick Bellasi
2019-05-16 12:42     ` Patrick Bellasi
2019-05-16 13:01     ` Quentin Perret
2019-05-16 13:01       ` Quentin Perret
2019-05-16 13:22       ` Patrick Bellasi
2019-05-16 13:22         ` Patrick Bellasi
2019-06-19 16:08         ` Douglas Raillard
2019-06-20 13:04           ` Patrick Bellasi
2019-06-21 10:17             ` Quentin Perret
2019-06-21 10:22               ` Quentin Perret
2019-05-16 13:06     ` Douglas Raillard
2019-05-16 13:06       ` Douglas Raillard
2019-05-08 17:42 ` [RFC PATCH 2/7] sched/cpufreq: Attach perf domain to sugov policy douglas.raillard
2019-05-08 17:42   ` douglas.raillard
2019-05-08 17:42 ` [RFC PATCH 3/7] sched/cpufreq: Hook em_pd_get_higher_power() into get_next_freq() douglas.raillard
2019-05-08 17:42   ` douglas.raillard
2019-05-08 17:42 ` [RFC PATCH 4/7] sched/cpufreq: Move up sugov_cpu_is_busy() douglas.raillard
2019-05-08 17:42   ` douglas.raillard
2019-05-08 17:42 ` douglas.raillard [this message]
2019-05-08 17:42   ` [RFC PATCH 5/7] sched/cpufreq: sugov_cpu_is_busy for shared policy douglas.raillard
2019-05-08 17:43 ` [RFC PATCH 6/7] sched/cpufreq: Improve sugov_cpu_is_busy accuracy douglas.raillard
2019-05-08 17:43   ` douglas.raillard
2019-05-16 12:55   ` Patrick Bellasi
2019-05-16 12:55     ` Patrick Bellasi
2019-06-19 16:19     ` Douglas Raillard
2019-06-20 11:05       ` Patrick Bellasi
2019-05-08 17:43 ` [RFC PATCH 7/7] sched/cpufreq: Boost schedutil frequency ramp up douglas.raillard
2019-05-08 17:43   ` douglas.raillard
2019-05-13  7:12 ` [RFC PATCH 0/7] sched/cpufreq: Make schedutil energy aware Viresh Kumar
2019-05-13  7:12   ` Viresh Kumar
2019-05-13 13:52   ` Douglas Raillard
2019-05-13 13:52     ` Douglas Raillard

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