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path: root/drivers/cpuidle
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Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/governors/menu.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 9f3d77532ab9..68104434ebb5 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -96,6 +96,7 @@
struct menu_device {
int last_state_idx;
+ int needs_update;
unsigned int expected_us;
u64 predicted_us;
@@ -166,6 +167,8 @@ static inline int performance_multiplier(void)
static DEFINE_PER_CPU(struct menu_device, menu_devices);
+static void menu_update(struct cpuidle_device *dev);
+
/**
* menu_select - selects the next idle state to enter
* @dev: the CPU
@@ -180,6 +183,11 @@ static int menu_select(struct cpuidle_device *dev)
data->last_state_idx = 0;
data->exit_us = 0;
+ if (data->needs_update) {
+ menu_update(dev);
+ data->needs_update = 0;
+ }
+
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0))
return 0;
@@ -231,7 +239,7 @@ static int menu_select(struct cpuidle_device *dev)
}
/**
- * menu_reflect - attempts to guess what happened after entry
+ * menu_reflect - records that data structures need update
* @dev: the CPU
*
* NOTE: it's important to be fast here because this operation will add to
@@ -240,6 +248,16 @@ static int menu_select(struct cpuidle_device *dev)
static void menu_reflect(struct cpuidle_device *dev)
{
struct menu_device *data = &__get_cpu_var(menu_devices);
+ data->needs_update = 1;
+}
+
+/**
+ * menu_update - attempts to guess what happened after entry
+ * @dev: the CPU
+ */
+static void menu_update(struct cpuidle_device *dev)
+{
+ struct menu_device *data = &__get_cpu_var(menu_devices);
int last_idx = data->last_state_idx;
unsigned int last_idle_us = cpuidle_get_last_residency(dev);
struct cpuidle_state *target = &dev->states[last_idx];