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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-10-01 11:56:21 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-10-03 12:02:44 +0200
commit03dba278043358bbbf4f029be169e1e73d2fbe2b (patch)
treeb381cb30e44849fe3cf4c8457fc81fbfb4f14903 /drivers/cpuidle
parentcpuidle: enter_state: Don't needlessly calculate diff time (diff)
downloadlinux-03dba278043358bbbf4f029be169e1e73d2fbe2b.tar.xz
linux-03dba278043358bbbf4f029be169e1e73d2fbe2b.zip
cpuidle: menu: Replace data->predicted_us with local variable
The predicted_us field in struct menu_device is only accessed in menu_select(), so replace it with a local variable in that function. With that, stop using expected_interval instead of predicted_us to store the new predicted idle duration value if it is set to the selected state's target residency which is quite confusing. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/governors/menu.c23
1 files changed, 11 insertions, 12 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 021b08dd139c..b6684fd89085 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -124,7 +124,6 @@ struct menu_device {
int tick_wakeup;
unsigned int next_timer_us;
- unsigned int predicted_us;
unsigned int bucket;
unsigned int correction_factor[BUCKETS];
unsigned int intervals[INTERVALS];
@@ -290,6 +289,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
int idx;
unsigned int interactivity_req;
unsigned int expected_interval;
+ unsigned int predicted_us;
unsigned long nr_iowaiters, cpu_load;
ktime_t delta_next;
@@ -315,7 +315,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* operands are 32 bits.
* Make sure to round up for half microseconds.
*/
- data->predicted_us = DIV_ROUND_CLOSEST_ULL((uint64_t)data->next_timer_us *
+ predicted_us = DIV_ROUND_CLOSEST_ULL((uint64_t)data->next_timer_us *
data->correction_factor[data->bucket],
RESOLUTION * DECAY);
@@ -341,7 +341,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
/*
* Use the lowest expected idle interval to pick the idle state.
*/
- data->predicted_us = min(data->predicted_us, expected_interval);
+ predicted_us = min(predicted_us, expected_interval);
if (tick_nohz_tick_stopped()) {
/*
@@ -352,19 +352,18 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* the known time till the closest timer event for the idle
* state selection.
*/
- if (data->predicted_us < TICK_USEC)
- data->predicted_us = ktime_to_us(delta_next);
+ if (predicted_us < TICK_USEC)
+ predicted_us = ktime_to_us(delta_next);
} else {
/*
* Use the performance multiplier and the user-configurable
* latency_req to determine the maximum exit latency.
*/
- interactivity_req = data->predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
+ interactivity_req = predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
if (latency_req > interactivity_req)
latency_req = interactivity_req;
}
- expected_interval = data->predicted_us;
/*
* Find the idle state with the lowest power while satisfying
* our constraints.
@@ -378,8 +377,8 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
continue;
if (idx == -1)
idx = i; /* first enabled state */
- if (s->target_residency > data->predicted_us) {
- if (data->predicted_us < TICK_USEC)
+ if (s->target_residency > predicted_us) {
+ if (predicted_us < TICK_USEC)
break;
if (!tick_nohz_tick_stopped()) {
@@ -389,7 +388,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* tick in that case and let the governor run
* again in the next iteration of the loop.
*/
- expected_interval = drv->states[idx].target_residency;
+ predicted_us = drv->states[idx].target_residency;
break;
}
@@ -412,7 +411,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* expected idle duration so that the tick is retained
* as long as that target residency is low enough.
*/
- expected_interval = drv->states[idx].target_residency;
+ predicted_us = drv->states[idx].target_residency;
break;
}
idx = i;
@@ -426,7 +425,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* expected idle duration is shorter than the tick period length.
*/
if (((drv->states[idx].flags & CPUIDLE_FLAG_POLLING) ||
- expected_interval < TICK_USEC) && !tick_nohz_tick_stopped()) {
+ predicted_us < TICK_USEC) && !tick_nohz_tick_stopped()) {
unsigned int delta_next_us = ktime_to_us(delta_next);
*stop_tick = false;