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cpuidle: teo: Ignore disabled idle states that are too deep

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commit 069ce2ef1a6dd84cbd4d897b333e30f825e021f0 upstream.

Prevent disabled CPU idle state with target residencies beyond the
anticipated idle duration from being taken into account by the TEO
governor.

Fixes: b26bf6ab71 ("cpuidle: New timer events oriented governor for tickless systems")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki 2019-10-10 23:32:17 +02:00 • committed by Greg Kroah-Hartman
commit b327b673c5
1 changed files with 7 additions and 0 deletions
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7
drivers/cpuidle/governors/teo.c
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@ -257,6 +257,13 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
struct cpuidle_state_usage *su = &dev->states_usage[i];
if (s->disabled || su->disable) {
/*
* Ignore disabled states with target residencies beyond
* the anticipated idle duration.
*/
if (s->target_residency > duration_us)
continue;
/*
* If the "early hits" metric of a disabled state is
* greater than the current maximum, it should be taken