cpuidle: menu: Avoid computations for very close timers

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If the next timer event (not including the tick) is closer than the
target residency of the second state or the PM QoS latency constraint
is below its exit latency, state[0] will be used regardless of any
other factors, so skip the computations in menu_select() then and
return 0 straight away from it.

Still, do that after the bucket has been determined to avoid
updating the correction factor for a stale bucket.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

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Rafael J. Wysocki 2018-10-02 23:46:28 +02:00

parent eb40a380bf

commit 8b007ebec9

1 changed files with 12 additions and 0 deletions

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drivers/cpuidle/governors/menu.c

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