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cpuidle,menu: use interactivity_req to disable polling

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The menu governor carefully figures out how much time we typically
sleep for an estimated sleep interval, or whether there is a repeating
pattern going on, and corrects that estimate for the CPU load.

Then it proceeds to ignore that information when determining whether
or not to consider polling. This is not a big deal on most x86 CPUs,
which have very low C1 latencies, and the patch should not have any
effect on those CPUs.

However, certain CPUs (eg. Atom) have much higher C1 latencies, and
it would be good to not waste performance and power on those CPUs if
we are expecting a very low wakeup latency.

Disable polling based on the estimated interactivity requirement, not
on the time to the next timer interrupt.

Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rik van Riel 2015-11-03 17:34:18 -05:00 committed by Rafael J. Wysocki
parent 7884084f3b
commit a9ceb78bc7
1 changed files with 1 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/cpuidle/governors/menu.c
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@ -330,7 +330,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
* We want to default to C1 (hlt), not to busy polling
* unless the timer is happening really really soon.
*/
if (data->next_timer_us > 20 &&
if (interactivity_req > 20 &&
!drv->states[CPUIDLE_DRIVER_STATE_START].disabled &&
dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0)
data->last_state_idx = CPUIDLE_DRIVER_STATE_START;