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SubjectRe: [PATCH v2 2/2] cpufreq / sched: Pass runqueue pointer to cpufreq_update_util()
LGTM

On Fri, Aug 12, 2016 at 02:06:44AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>
> All of the callers of cpufreq_update_util() pass rq_clock(rq) to it
> as the time argument and some of them check whether or not cpu_of(rq)
> is equal to smp_processor_id() before calling it, so rework it to
> take a runqueue pointer as the argument and move the rq_clock(rq)
> evaluation into it.
>
> Additionally, provide a wrapper checking cpu_of(rq) against
> smp_processor_id() for the cpufreq_update_util() callers that
> need it.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
>
> This is a new patch based on the [2/2] from v1.
>
> ---
> kernel/sched/deadline.c | 3 +--
> kernel/sched/fair.c | 4 +---
> kernel/sched/rt.c | 3 +--
> kernel/sched/sched.h | 15 +++++++++++----
> 4 files changed, 14 insertions(+), 11 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_this_cpu(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
> @@ -2894,7 +2892,7 @@ static inline void cfs_rq_util_change(st
> *
> * See cpu_util().
> */
> - 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_this_cpu(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
> @@ -1763,7 +1763,7 @@ 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
> @@ -1783,16 +1783,23 @@ 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;
>
> 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);
> +}
> +
> +static inline void cpufreq_update_this_cpu(struct rq *rq, unsigned int flags)
> +{
> + if (cpu_of(rq) == smp_processor_id())
> + cpufreq_update_util(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) {}
> +static inline void cpufreq_update_this_cpu(struct rq *rq, unsigned int flags) {}
> #endif /* CONFIG_CPU_FREQ */
>
> #ifdef arch_scale_freq_capacity
>

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