[RFC PATCH v2 2/6] cpuidle: Add Active Stats calls tracking idle entry/exit
From: Lukasz Luba <lukasz.luba@arm.com>
Date: 2021-07-06 13:18:50
Also in:
lkml
Subsystem:
cpu idle time management framework, the rest · Maintainers:
"Rafael J. Wysocki", Daniel Lezcano, Linus Torvalds
The Active Stats framework tracks and accounts the activity of the CPU for each performance level. It accounts the real residency, when the CPU was not idle, at a given performance level. This patch adds needed calls which provide the CPU idle entry/exit events to the Active Stats framework. Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> --- drivers/cpuidle/cpuidle.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index ef2ea1b12cd8..24a33c6c4a62 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c@@ -8,6 +8,7 @@ * This code is licenced under the GPL. */ +#include <linux/active_stats.h> #include <linux/clockchips.h> #include <linux/kernel.h> #include <linux/mutex.h>
@@ -231,6 +232,8 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, trace_cpu_idle(index, dev->cpu); time_start = ns_to_ktime(local_clock()); + active_stats_cpu_idle_enter(time_start); + stop_critical_timings(); if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE)) rcu_idle_enter();
@@ -243,6 +246,8 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, time_end = ns_to_ktime(local_clock()); trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu); + active_stats_cpu_idle_exit(time_end); + /* The cpu is no longer idle or about to enter idle. */ sched_idle_set_state(NULL);
--
2.17.1