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authorDaniel Lezcano <daniel.lezcano@linaro.org>2019-08-02 19:34:23 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-09-03 11:33:29 +0200
commit82e430a6df7f0b5972c7fe717faffea823c6b84a (patch)
tree464c1a59817af384666f36669b3e0d5187be2ffe /kernel/sched/idle.c
parent97d3eb9da84cae0548359b0aecb8619faad003b7 (diff)
cpuidle: play_idle: Increase the resolution to usec
The play_idle resolution is 1ms. The intel_powerclamp bases the idle duration on jiffies. The idle injection API is also using msec based duration but has no user yet. Unfortunately, msec based time does not fit well when we want to inject idle cycle precisely with shallow idle state. In order to set the scene for the incoming idle injection user, move the precision up to usec when calling play_idle. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/sched/idle.c')
-rw-r--r--kernel/sched/idle.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 80940939b733..b98283fc6914 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -311,7 +311,7 @@ static enum hrtimer_restart idle_inject_timer_fn(struct hrtimer *timer)
return HRTIMER_NORESTART;
}
-void play_idle(unsigned long duration_ms)
+void play_idle(unsigned long duration_us)
{
struct idle_timer it;
@@ -323,7 +323,7 @@ void play_idle(unsigned long duration_ms)
WARN_ON_ONCE(current->nr_cpus_allowed != 1);
WARN_ON_ONCE(!(current->flags & PF_KTHREAD));
WARN_ON_ONCE(!(current->flags & PF_NO_SETAFFINITY));
- WARN_ON_ONCE(!duration_ms);
+ WARN_ON_ONCE(!duration_us);
rcu_sleep_check();
preempt_disable();
@@ -333,7 +333,8 @@ void play_idle(unsigned long duration_ms)
it.done = 0;
hrtimer_init_on_stack(&it.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
it.timer.function = idle_inject_timer_fn;
- hrtimer_start(&it.timer, ms_to_ktime(duration_ms), HRTIMER_MODE_REL_PINNED);
+ hrtimer_start(&it.timer, ns_to_ktime(duration_us * NSEC_PER_USEC),
+ HRTIMER_MODE_REL_PINNED);
while (!READ_ONCE(it.done))
do_idle();