linux-kernel - [RFC PATCH v4 01/12] sched: Relocate arch_scale_cpu

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Message-Id: <20180628114043.24724-2-quentin.perret@arm.com>
Date:   Thu, 28 Jun 2018 12:40:32 +0100
From:   Quentin Perret <quentin.perret@....com>
To:     peterz@...radead.org, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, mingo@...hat.com,
        dietmar.eggemann@....com, morten.rasmussen@....com,
        chris.redpath@....com, patrick.bellasi@....com,
        valentin.schneider@....com, vincent.guittot@...aro.org,
        thara.gopinath@...aro.org, viresh.kumar@...aro.org,
        tkjos@...gle.com, joel@...lfernandes.org, smuckle@...gle.com,
        adharmap@...cinc.com, skannan@...cinc.com, pkondeti@...eaurora.org,
        juri.lelli@...hat.com, edubezval@...il.com,
        srinivas.pandruvada@...ux.intel.com, currojerez@...eup.net,
        javi.merino@...nel.org, quentin.perret@....com
Subject: [RFC PATCH v4 01/12] sched: Relocate arch_scale_cpu_capacity

By default, arch_scale_cpu_capacity() is only visible from within the
kernel/sched folder. Relocate it to include/linux/sched/topology.h to
make it visible to other clients needing to know about the capacity of
CPUs, such as the Energy Model framework.

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Quentin Perret <quentin.perret@....com>
---
 include/linux/sched/topology.h | 19 +++++++++++++++++++
 kernel/sched/sched.h           | 18 ------------------
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 26347741ba50..1e24e88bee6d 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -202,6 +202,17 @@ extern void set_sched_topology(struct sched_domain_topology_level *tl);
 # define SD_INIT_NAME(type)
 #endif
 
+#ifndef arch_scale_cpu_capacity
+static __always_inline
+unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
+{
+	if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1))
+		return sd->smt_gain / sd->span_weight;
+
+	return SCHED_CAPACITY_SCALE;
+}
+#endif
+
 #else /* CONFIG_SMP */
 
 struct sched_domain_attr;
@@ -217,6 +228,14 @@ static inline bool cpus_share_cache(int this_cpu, int that_cpu)
 	return true;
 }
 
+#ifndef arch_scale_cpu_capacity
+static __always_inline
+unsigned long arch_scale_cpu_capacity(void __always_unused *sd, int cpu)
+{
+	return SCHED_CAPACITY_SCALE;
+}
+#endif
+
 #endif	/* !CONFIG_SMP */
 
 static inline int task_node(const struct task_struct *p)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 67702b4d9ac7..34549bca487d 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1730,30 +1730,12 @@ unsigned long arch_scale_freq_capacity(int cpu)
 #ifdef CONFIG_SMP
 extern void sched_avg_update(struct rq *rq);
 
-#ifndef arch_scale_cpu_capacity
-static __always_inline
-unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
-{
-	if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1))
-		return sd->smt_gain / sd->span_weight;
-
-	return SCHED_CAPACITY_SCALE;
-}
-#endif
-
 static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta)
 {
 	rq->rt_avg += rt_delta * arch_scale_freq_capacity(cpu_of(rq));
 	sched_avg_update(rq);
 }
 #else
-#ifndef arch_scale_cpu_capacity
-static __always_inline
-unsigned long arch_scale_cpu_capacity(void __always_unused *sd, int cpu)
-{
-	return SCHED_CAPACITY_SCALE;
-}
-#endif
 static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { }
 static inline void sched_avg_update(struct rq *rq) { }
 #endif
-- 
2.17.1