From 9d1393ef1cbf7d3274e206eee8210aba0cc2667e Mon Sep 17 00:00:00 2001 From: Vincent Guittot Date: Thu, 25 Jul 2013 13:56:08 +0200 Subject: cpuidle: set the current wake up latency Save the current wake up latency of a core. This latency is not always the latency of a defined c-state but can also be an intermediate value when a core is ready to shutdown (timer migration, cache flush ...) but wait for the last core of the cluster to finalize the cluster power down. This latter use case is not manage by the current version of the patch because it implies that the cpuidle drivers set the wake up latency instead of the cpuidle core. Signed-off-by: Vincent Guittot Conflicts: drivers/cpuidle/cpuidle.c --- drivers/cpuidle/cpuidle.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index d75040ddd2b3..7b6553b049cd 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include "cpuidle.h" @@ -42,6 +43,12 @@ void disable_cpuidle(void) off = 1; } +static void cpuidle_set_current_state(int cpu, int latency) +{ + struct sched_pm *stat = &per_cpu(sched_stat, cpu); + + atomic_set(&(stat->wake_latency), latency); +} /** * cpuidle_play_dead - cpu off-lining * @@ -79,12 +86,16 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, ktime_t time_start, time_end; s64 diff; + cpuidle_set_current_state(dev->cpu, target_state->exit_latency); + time_start = ktime_get(); entered_state = target_state->enter(dev, drv, index); time_end = ktime_get(); + cpuidle_set_current_state(dev->cpu, 0); + local_irq_enable(); diff = ktime_to_us(ktime_sub(time_end, time_start)); -- cgit v1.2.3