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Code Issues Releases Wiki Activity

cpuidle: Pass exit latency limit to cpuidle_use_deepest_state() 

Modify cpuidle_use_deepest_state() to take an additional exit latency
limit argument to be passed to find_deepest_idle_state() and make
cpuidle_idle_call() pass dev->forced_idle_latency_limit_ns to it for
forced idle.

Suggested-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
[ rjw: Rebase and rearrange code, subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Daniel Lezcano 2019-11-16 14:16:13 +01:00 committed by Rafael J. Wysocki
parent c55b51a06b
commit 5aa9ba6312
3 changed files with 14 additions and 5 deletions
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5
drivers/cpuidle/cpuidle.c
View File

@ -123,9 +123,10 @@ void cpuidle_use_deepest_state(u64 latency_limit_ns)
* @dev: cpuidle device for the given CPU.
*/
int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
struct cpuidle_device *dev,
u64 latency_limit_ns)
{
return find_deepest_state(drv, dev, U64_MAX, 0, false);
return find_deepest_state(drv, dev, latency_limit_ns, 0, false);
}
#ifdef CONFIG_SUSPEND

6
include/linux/cpuidle.h
View File

@ -213,13 +213,15 @@ static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; }
#ifdef CONFIG_CPU_IDLE
extern int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
struct cpuidle_device *dev);
struct cpuidle_device *dev,
u64 latency_limit_ns);
extern int cpuidle_enter_s2idle(struct cpuidle_driver *drv,
struct cpuidle_device *dev);
extern void cpuidle_use_deepest_state(u64 latency_limit_ns);
#else
static inline int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
struct cpuidle_device *dev,
u64 latency_limit_ns)
{return -ENODEV; }
static inline int cpuidle_enter_s2idle(struct cpuidle_driver *drv,
struct cpuidle_device *dev)

8
kernel/sched/idle.c
View File

@ -166,6 +166,8 @@ static void cpuidle_idle_call(void)
*/
if (idle_should_enter_s2idle() || dev->forced_idle_latency_limit_ns) {
u64 max_latency_ns;
if (idle_should_enter_s2idle()) {
rcu_idle_enter();
@ -176,12 +178,16 @@ static void cpuidle_idle_call(void)
}
rcu_idle_exit();
max_latency_ns = U64_MAX;
} else {
max_latency_ns = dev->forced_idle_latency_limit_ns;
}
tick_nohz_idle_stop_tick();
rcu_idle_enter();
next_state = cpuidle_find_deepest_state(drv, dev);
next_state = cpuidle_find_deepest_state(drv, dev, max_latency_ns);
call_cpuidle(drv, dev, next_state);
} else {
bool stop_tick = true;