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authorRik van Riel <riel@redhat.com>2016-03-16 17:14:00 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-03-17 02:40:32 +0100
commite132b9b3bc7f19e9b158e42b323881d5dee5ecf3 (patch)
treea0a6110382cfc74e379542505edbc0466894f6de /drivers
parentcpuidle: menu: help gcc generate slightly better code (diff)
downloadlinux-e132b9b3bc7f19e9b158e42b323881d5dee5ecf3.tar.xz
linux-e132b9b3bc7f19e9b158e42b323881d5dee5ecf3.zip
cpuidle: menu: use high confidence factors only when considering polling
The menu governor uses five different factors to pick the idle state: - the user configured latency_req - the time until the next timer (next_timer_us) - the typical sleep interval, as measured recently - an estimate of sleep time by dividing next_timer_us by an observed factor - a load corrected version of the above, divided again by load Only the first three items are known with enough confidence that we can use them to consider polling, instead of an actual CPU idle state, because the cost of being wrong about polling can be excessive power use. The latter two are used in the menu governor's main selection loop, and can result in choosing a shallower idle state when the system is expected to be busy again soon. This pushes a busy system in the "performance" direction of the performance<>power tradeoff, when choosing between idle states, but stays more strictly on the "power" state when deciding between polling and C1. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpuidle/governors/menu.c42
1 files changed, 24 insertions, 18 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 27fc733cb5b9..00c5f891e352 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -196,7 +196,7 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev);
* of points is below a threshold. If it is... then use the
* average of these 8 points as the estimated value.
*/
-static void get_typical_interval(struct menu_device *data)
+static unsigned int get_typical_interval(struct menu_device *data)
{
int i, divisor;
unsigned int max, thresh, avg;
@@ -253,9 +253,7 @@ again:
if (likely(variance <= U64_MAX/36)) {
if ((((u64)avg*avg > variance*36) && (divisor * 4 >= INTERVALS * 3))
|| variance <= 400) {
- if (data->next_timer_us > avg)
- data->predicted_us = avg;
- return;
+ return avg;
}
}
@@ -269,7 +267,7 @@ again:
* with sporadic activity with a bunch of short pauses.
*/
if ((divisor * 4) <= INTERVALS * 3)
- return;
+ return UINT_MAX;
thresh = max - 1;
goto again;
@@ -286,6 +284,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
int i;
unsigned int interactivity_req;
+ unsigned int expected_interval;
unsigned long nr_iowaiters, cpu_load;
if (data->needs_update) {
@@ -312,32 +311,39 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
data->correction_factor[data->bucket],
RESOLUTION * DECAY);
- get_typical_interval(data);
-
- /*
- * Performance multiplier defines a minimum predicted idle
- * duration / latency ratio. Adjust the latency limit if
- * necessary.
- */
- interactivity_req = data->predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
- if (latency_req > interactivity_req)
- latency_req = interactivity_req;
+ expected_interval = get_typical_interval(data);
+ expected_interval = min(expected_interval, data->next_timer_us);
if (CPUIDLE_DRIVER_STATE_START > 0) {
data->last_state_idx = CPUIDLE_DRIVER_STATE_START - 1;
/*
* We want to default to C1 (hlt), not to busy polling
- * unless the timer is happening really really soon.
+ * unless the timer is happening really really soon, or
+ * C1's exit latency exceeds the user configured limit.
*/
- if (interactivity_req > 20 &&
+ if (expected_interval > drv->states[CPUIDLE_DRIVER_STATE_START].target_residency &&
+ latency_req > drv->states[CPUIDLE_DRIVER_STATE_START].exit_latency &&
!drv->states[CPUIDLE_DRIVER_STATE_START].disabled &&
- dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0)
+ !dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable)
data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
} else {
data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
}
/*
+ * Use the lowest expected idle interval to pick the idle state.
+ */
+ data->predicted_us = min(data->predicted_us, expected_interval);
+
+ /*
+ * 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);
+ if (latency_req > interactivity_req)
+ latency_req = interactivity_req;
+
+ /*
* Find the idle state with the lowest power while satisfying
* our constraints.
*/