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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-10-02 23:47:43 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-10-04 19:27:27 +0200 |
| commit | 53812cdc9100e19f2e782851964355f2db5583de (patch) | |
| tree | 8a352e864ef0055a365ce8ba37cfb4423d708ee0 | |
| parent | cpuidle: menu: Avoid computations for very close timers (diff) | |
| download | linux-53812cdc9100e19f2e782851964355f2db5583de.tar.xz linux-53812cdc9100e19f2e782851964355f2db5583de.zip | |
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>
| -rw-r--r-- | drivers/cpuidle/governors/menu.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index 667606c6e284..b754296eb0c5 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -297,19 +297,13 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, 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 */ data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length(&delta_next)); get_iowait_load(&nr_iowaiters, &cpu_load); 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 || latency_req < drv->states[1].exit_latency) && !drv->states[0].disabled && !dev->states_usage[0].disable)) { |