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SubjectRe: [PATCH v8 04/16] sched/core: uclamp: Add system default clamps
On 08-May 21:00, Peter Zijlstra wrote:
>
> There was a bunch of repetition that seemed fragile; does something like
> the below make sense?

Absolutely yes... will add to v9, thanks.

> Index: linux-2.6/kernel/sched/core.c
> ===================================================================
> --- linux-2.6.orig/kernel/sched/core.c
> +++ linux-2.6/kernel/sched/core.c
> @@ -770,6 +770,9 @@ unsigned int sysctl_sched_uclamp_util_ma
> /* All clamps are required to be less or equal than these values */
> static struct uclamp_se uclamp_default[UCLAMP_CNT];
>
> +#define for_each_clamp_id(clamp_id) \
> + for ((clamp_id) = 0; (clamp_id) < UCLAMP_CNT; (clamp_id)++)
> +
> /* Integer rounded range for each bucket */
> #define UCLAMP_BUCKET_DELTA DIV_ROUND_CLOSEST(SCHED_CAPACITY_SCALE, UCLAMP_BUCKETS)
>
> @@ -790,6 +793,12 @@ static inline unsigned int uclamp_none(i
> return SCHED_CAPACITY_SCALE;
> }
>
> +static inline void uclamp_se_set(struct uclamp_se *uc_se, unsigned int value)
> +{
> + uc_se->value = value;
> + uc_se->bucket_id = uclamp_bucket_id(value);
> +}
> +
> static inline unsigned int
> uclamp_idle_value(struct rq *rq, unsigned int clamp_id, unsigned int clamp_value)
> {
> @@ -977,7 +986,7 @@ static inline void uclamp_rq_inc(struct
> if (unlikely(!p->sched_class->uclamp_enabled))
> return;
>
> - for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id)
> + for_each_clamp_id(clamp_id)
> uclamp_rq_inc_id(p, rq, clamp_id);
>
> /* Reset clamp idle holding when there is one RUNNABLE task */
> @@ -992,7 +1001,7 @@ static inline void uclamp_rq_dec(struct
> if (unlikely(!p->sched_class->uclamp_enabled))
> return;
>
> - for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id)
> + for_each_clamp_id(clamp_id)
> uclamp_rq_dec_id(p, rq, clamp_id);
> }
>
> @@ -1021,16 +1030,13 @@ int sysctl_sched_uclamp_handler(struct c
> }
>
> if (old_min != sysctl_sched_uclamp_util_min) {
> - uclamp_default[UCLAMP_MIN].value =
> - sysctl_sched_uclamp_util_min;
> - uclamp_default[UCLAMP_MIN].bucket_id =
> - uclamp_bucket_id(sysctl_sched_uclamp_util_min);
> + uclamp_se_set(&uclamp_default[UCLAMP_MIN],
> + sysctl_sched_uclamp_util_min);
> }
> +
> if (old_max != sysctl_sched_uclamp_util_max) {
> - uclamp_default[UCLAMP_MAX].value =
> - sysctl_sched_uclamp_util_max;
> - uclamp_default[UCLAMP_MAX].bucket_id =
> - uclamp_bucket_id(sysctl_sched_uclamp_util_max);
> + uclamp_se_set(&uclamp_default[UCLAMP_MAX],
> + sysctl_sched_uclamp_util_max);
> }
>
> /*
> @@ -1052,7 +1058,7 @@ static void uclamp_fork(struct task_stru
> {
> unsigned int clamp_id;
>
> - for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id)
> + for_each_clamp_id(clamp_id)
> p->uclamp[clamp_id].active = false;
> }
>
> @@ -1067,17 +1073,12 @@ static void __init init_uclamp(void)
> cpu_rq(cpu)->uclamp_flags = 0;
> }
>
> - for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id) {
> - struct uclamp_se *uc_se = &init_task.uclamp_req[clamp_id];
> -
> - uc_se->value = uclamp_none(clamp_id);
> - uc_se->bucket_id = uclamp_bucket_id(uc_se->value);
> - }
> + for_each_clamp_id(clamp_id)
> + uclamp_se_set(&init_task.uclamp_req[clamp_id], uclamp_none(clamp_id));
>
> /* System defaults allow max clamp values for both indexes */
> - uc_max.value = uclamp_none(UCLAMP_MAX);
> - uc_max.bucket_id = uclamp_bucket_id(uc_max.value);
> - for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id)
> + uclamp_se_set(&uc_max, uclamp_none(UCLAMP_MAX));
> + for_each_clamp_id(clamp_id)
> uclamp_default[clamp_id] = uc_max;
> }
>
>

--
#include <best/regards.h>

Patrick Bellasi

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