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cpuidle: powernv: Don't bounce between low and very low thread priority

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The core of snooze_loop() continually bounces between low and very
low thread priority. Changing thread priorities is an expensive
operation that can negatively impact other threads on a core.

All CPUs that can run PowerNV support very low priority, so we can
avoid the change completely.

Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Anton Blanchard 2017-04-04 07:54:12 +10:00 committed by Rafael J. Wysocki
parent 02018b3929
commit 79b578111f
1 changed files with 0 additions and 1 deletions
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drivers/cpuidle/cpuidle-powernv.c
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@ -57,7 +57,6 @@ static int snooze_loop(struct cpuidle_device *dev,
snooze_exit_time = get_tb() + snooze_timeout;
ppc64_runlatch_off();
while (!need_resched()) {
HMT_low();
HMT_very_low();
if (snooze_timeout_en && get_tb() > snooze_exit_time)
break;