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cpuidle/menu: stop seeking deeper idle if current state is deep enough 

Obsolete commit 71abbbf856 (cpuidle: extend cpuidle and menu governor
to handle dynamic states) wanted to introduce dynamic C-states, but that
idea was dropped long ago.  The nonsense deeper C-state checking
remained, though.

Since both target_residency and exit_latency are longer for deeper
idle state, there's no need to waste CPU time on useless checks.

Signed-off-by: Alex Shi <alex.shi@linaro.org>
Acked-by: Rik van Riel <riel@redhat.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Alex Shi 2017-01-12 21:27:02 +08:00 committed by Rafael J. Wysocki
parent 2dc8ffad8c
commit 8e37e1a2a3
1 changed files with 2 additions and 2 deletions
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4
drivers/cpuidle/governors/menu.c
View File

@ -357,9 +357,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
if (s->disabled || su->disable)
continue;
if (s->target_residency > data->predicted_us)
continue;
break;
if (s->exit_latency > latency_req)
continue;
break;
data->last_state_idx = i;
}