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SubjectRe: [PATCH 08/11] sched: schedutil: remove sugov_aggregate_util()
On 28-06-18, 17:45, Vincent Guittot wrote:
> There is no reason why sugov_get_util() and sugov_aggregate_util()
> were in fact separate functions.
>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> [rebased after adding irq tracking and fixed some compilation errors]
> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
> ---
> kernel/sched/cpufreq_schedutil.c | 44 ++++++++++++++--------------------------
> kernel/sched/sched.h | 2 +-
> 2 files changed, 16 insertions(+), 30 deletions(-)
>
> diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
> index b77bfef..d04f941 100644
> --- a/kernel/sched/cpufreq_schedutil.c
> +++ b/kernel/sched/cpufreq_schedutil.c
> @@ -53,12 +53,7 @@ struct sugov_cpu {
> unsigned int iowait_boost_max;
> u64 last_update;
>
> - /* The fields below are only needed when sharing a policy: */
> - unsigned long util_cfs;
> - unsigned long util_dl;
> unsigned long bw_dl;
> - unsigned long util_rt;
> - unsigned long util_irq;
> unsigned long max;
>
> /* The field below is for single-CPU policies only: */
> @@ -182,38 +177,31 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy,
> return cpufreq_driver_resolve_freq(policy, freq);
> }
>
> -static void sugov_get_util(struct sugov_cpu *sg_cpu)
> +static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
> {
> struct rq *rq = cpu_rq(sg_cpu->cpu);
> + unsigned long util, irq, max;
>
> - sg_cpu->max = arch_scale_cpu_capacity(NULL, sg_cpu->cpu);
> - sg_cpu->util_cfs = cpu_util_cfs(rq);
> - sg_cpu->util_dl = cpu_util_dl(rq);
> - sg_cpu->bw_dl = cpu_bw_dl(rq);
> - sg_cpu->util_rt = cpu_util_rt(rq);
> - sg_cpu->util_irq = cpu_util_irq(rq);
> -}
> -
> -static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
> -{
> - struct rq *rq = cpu_rq(sg_cpu->cpu);
> - unsigned long util, max = sg_cpu->max;
> + sg_cpu->max = max = arch_scale_cpu_capacity(NULL, sg_cpu->cpu);
> + sg_cpu->bw_dl = cpu_bw_dl(rq);
>
> if (rq->rt.rt_nr_running)
> - return sg_cpu->max;
> + return max;
> +
> + irq = cpu_util_irq(rq);
>
> - if (unlikely(sg_cpu->util_irq >= max))
> + if (unlikely(irq >= max))
> return max;
>
> /* Sum rq utilization */
> - util = sg_cpu->util_cfs;
> - util += sg_cpu->util_rt;
> + util = cpu_util_cfs(rq);
> + util += cpu_util_rt(rq);
>
> /*
> * Interrupt time is not seen by rqs utilization nso we can compare
> * them with the CPU capacity
> */
> - if ((util + sg_cpu->util_dl) >= max)
> + if ((util + cpu_util_dl(rq)) >= max)
> return max;
>
> /*
> @@ -231,11 +219,11 @@ static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
> */
>
> /* Weight rqs utilization to normal context window */
> - util *= (max - sg_cpu->util_irq);
> + util *= (max - irq);
> util /= max;
>
> /* Add interrupt utilization */
> - util += sg_cpu->util_irq;
> + util += irq;
>
> /* Add DL bandwidth requirement */
> util += sg_cpu->bw_dl;
> @@ -418,9 +406,8 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
>
> busy = sugov_cpu_is_busy(sg_cpu);
>
> - sugov_get_util(sg_cpu);
> + util = sugov_get_util(sg_cpu);
> max = sg_cpu->max;
> - util = sugov_aggregate_util(sg_cpu);
> sugov_iowait_apply(sg_cpu, time, &util, &max);
> next_f = get_next_freq(sg_policy, util, max);
> /*
> @@ -459,9 +446,8 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
> struct sugov_cpu *j_sg_cpu = &per_cpu(sugov_cpu, j);
> unsigned long j_util, j_max;
>
> - sugov_get_util(j_sg_cpu);
> + j_util = sugov_get_util(j_sg_cpu);
> j_max = j_sg_cpu->max;
> - j_util = sugov_aggregate_util(j_sg_cpu);
> sugov_iowait_apply(j_sg_cpu, time, &j_util, &j_max);
>
> if (j_util * max > j_max * util) {
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 9438e68..59a633d 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -2219,7 +2219,7 @@ static inline unsigned long cpu_util_cfs(struct rq *rq)
>
> static inline unsigned long cpu_util_rt(struct rq *rq)
> {
> - return rq->avg_rt.util_avg;
> + return READ_ONCE(rq->avg_rt.util_avg);
> }
>
> #if defined(CONFIG_IRQ_TIME_ACCOUNTING) || defined(CONFIG_PARAVIRT_TIME_ACCOUNTING)

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

--
viresh

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