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cpuidle: menu: Move the latency_req == 0 special case check 

It is better to always update data->bucket before returning from
menu_select() to avoid updating the correction factor for a stale
bucket, so combine the latency_req == 0 special check with the more
general check below.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
This commit is contained in:
Rafael J. Wysocki 2018-10-02 23:47:43 +02:00
parent 8b007ebec9
commit 53812cdc91
1 changed files with 1 additions and 7 deletions
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8
drivers/cpuidle/governors/menu.c
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@ -297,19 +297,13 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
data->needs_update = 0; data->needs_update = 0;
} }
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0)) {
*stop_tick = false;
return 0;
}
/* determine the expected residency time, round up */ /* determine the expected residency time, round up */
data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length(&delta_next)); data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length(&delta_next));
get_iowait_load(&nr_iowaiters, &cpu_load); get_iowait_load(&nr_iowaiters, &cpu_load);
data->bucket = which_bucket(data->next_timer_us, nr_iowaiters); data->bucket = which_bucket(data->next_timer_us, nr_iowaiters);
if (unlikely(drv->state_count <= 1) || if (unlikely(drv->state_count <= 1 || latency_req == 0) ||
((data->next_timer_us < drv->states[1].target_residency || ((data->next_timer_us < drv->states[1].target_residency ||
latency_req < drv->states[1].exit_latency) && latency_req < drv->states[1].exit_latency) &&
!drv->states[0].disabled && !dev->states_usage[0].disable)) { !drv->states[0].disabled && !dev->states_usage[0].disable)) {