From: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
All of the callers of cpufreq_update_util() check whether or not
cpu_of(rq) is equal to smp_processor_id() before calling it and pass
rq_clock(rq) to it as the time argument, so rework it to take a
runqueue pointer as the argument and move the cpu_of(rq) check and
the rq_clock(rq) evaluation into it.
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
---
kernel/sched/deadline.c | 3 +--
kernel/sched/fair.c | 5 +----
kernel/sched/rt.c | 3 +--
kernel/sched/sched.h | 15 +++++++++------
4 files changed, 12 insertions(+), 14 deletions(-)
Index: linux-pm/kernel/sched/deadline.c
===================================================================
--- linux-pm.orig/kernel/sched/deadline.c
+++ linux-pm/kernel/sched/deadline.c
@@ -733,8 +733,7 @@ static void update_curr_dl(struct rq *rq
}
/* kick cpufreq (see the comment in kernel/sched/sched.h). */
- if (cpu_of(rq) == smp_processor_id())
- cpufreq_update_util(rq_clock(rq), SCHED_CPUFREQ_DL);
+ cpufreq_update_util(rq, SCHED_CPUFREQ_DL);
schedstat_set(curr->se.statistics.exec_max,
max(curr->se.statistics.exec_max, delta_exec));
Index: linux-pm/kernel/sched/fair.c
===================================================================
--- linux-pm.orig/kernel/sched/fair.c
+++ linux-pm/kernel/sched/fair.c
@@ -2876,8 +2876,6 @@ static inline void update_tg_load_avg(st
static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq)
{
if (&this_rq()->cfs == cfs_rq) {
- struct rq *rq = rq_of(cfs_rq);
-
/*
* There are a few boundary cases this might miss but it should
* get called often enough that that should (hopefully) not be
@@ -2894,8 +2892,7 @@ static inline void cfs_rq_util_change(st
*
* See cpu_util().
*/
- if (cpu_of(rq) == smp_processor_id())
- cpufreq_update_util(rq_clock(rq), 0);
+ cpufreq_update_util(rq_of(cfs_rq), 0);
}
}
Index: linux-pm/kernel/sched/rt.c
===================================================================
--- linux-pm.orig/kernel/sched/rt.c
+++ linux-pm/kernel/sched/rt.c
@@ -958,8 +958,7 @@ static void update_curr_rt(struct rq *rq
return;
/* Kick cpufreq (see the comment in kernel/sched/sched.h). */
- if (cpu_of(rq) == smp_processor_id())
- cpufreq_update_util(rq_clock(rq), SCHED_CPUFREQ_RT);
+ cpufreq_update_util(rq, SCHED_CPUFREQ_RT);
schedstat_set(curr->se.statistics.exec_max,
max(curr->se.statistics.exec_max, delta_exec));
Index: linux-pm/kernel/sched/sched.h
===================================================================
--- linux-pm.orig/kernel/sched/sched.h
+++ linux-pm/kernel/sched/sched.h
@@ -1763,11 +1763,11 @@ DECLARE_PER_CPU(struct update_util_data
/**
* cpufreq_update_util - Take a note about CPU utilization changes.
- * @time: Current time.
+ * @rq: Runqueue to carry out the update for.
* @flags: Update reason flags.
*
- * This function is called by the scheduler on the CPU whose utilization is
- * being updated.
+ * This function is called by the scheduler to invoke the CPU frequency
+ * governor.
*
* It can only be called from RCU-sched read-side critical sections.
*
@@ -1783,16 +1783,19 @@ DECLARE_PER_CPU(struct update_util_data
* but that really is a band-aid. Going forward it should be replaced with
* solutions targeted more specifically at RT and DL tasks.
*/
-static inline void cpufreq_update_util(u64 time, unsigned int flags)
+static inline void cpufreq_update_util(struct rq *rq, unsigned int flags)
{
struct update_util_data *data;
+ if (cpu_of(rq) != smp_processor_id())
+ return;
+
data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data));
if (data)
- data->func(data, time, flags);
+ data->func(data, rq_clock(rq), flags);
}
#else
-static inline void cpufreq_update_util(u64 time, unsigned int flags) {}
+static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
#endif /* CONFIG_CPU_FREQ */
#ifdef arch_scale_freq_capacity
