diff mbox series

[v1,1/2] cpuidle: teo: Fix alternative idle state lookup

Message ID 1794352.tdWV9SEqCh@kreacher
State New
Headers show
Series [v1,1/2] cpuidle: teo: Fix alternative idle state lookup | expand

Commit Message

Rafael J. Wysocki July 30, 2021, 2:38 p.m. UTC 
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

There are three mistakes in the loop in teo_select() that is looking
for an alternative candidate idle state.  First, it should walk all
of the idle states shallower than the current candidate one,
including all of the disabled ones, but it terminates after the first
enabled idle state.  Second, it should not terminate its last step
if idle state 0 is disabled (which is related to the first issue).
Finally, it may return the current alternative candidate idle state
prematurely if the time span criterion is not met by the idle state
under consideration at the moment.

To address the issues mentioned above, make the loop in question walk
all of the idle states shallower than the current candidate idle state
all the way down to idle state 0 and rearrange the checks in it.

Fixes: 77577558f25d ("cpuidle: teo: Rework most recent idle duration values treatment")
Reported-by: Doug Smythies <dsmythies@telus.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/cpuidle/governors/teo.c |   40 +++++++++++++++++++++++++++-------------
 1 file changed, 27 insertions(+), 13 deletions(-)
diff mbox series

Patch

Index: linux-pm/drivers/cpuidle/governors/teo.c
===================================================================
--- linux-pm.orig/drivers/cpuidle/governors/teo.c
+++ linux-pm/drivers/cpuidle/governors/teo.c
@@ -397,32 +397,46 @@  static int teo_select(struct cpuidle_dri
 		intercept_sum = 0;
 		recent_sum = 0;
 
-		for (i = idx - 1; i >= idx0; i--) {
+		for (i = idx - 1; i >= 0; i--) {
 			struct teo_bin *bin = &cpu_data->state_bins[i];
 			s64 span_ns;
 
 			intercept_sum += bin->intercepts;
 			recent_sum += bin->recent;
 
+			span_ns = teo_middle_of_bin(i, drv);
+
+			if ((!alt_recent || 2 * recent_sum > idx_recent_sum) &&
+			    (!alt_intercepts ||
+			     2 * intercept_sum > idx_intercept_sum)) {
+				if (teo_time_ok(span_ns) &&
+				    !dev->states_usage[i].disable) {
+					idx = i;
+					duration_ns = span_ns;
+				} else {
+					/*
+					 * The current state is too shallow or
+					 * disabled, so take the first enabled
+					 * deeper state with suitable time span.
+					 */
+					idx = last_enabled_idx;
+					duration_ns = last_enabled_span_ns;
+				}
+				break;
+			}
+
 			if (dev->states_usage[i].disable)
 				continue;
 
-			span_ns = teo_middle_of_bin(i, drv);
 			if (!teo_time_ok(span_ns)) {
 				/*
-				 * The current state is too shallow, so select
-				 * the first enabled deeper state.
+				 * The current state is too shallow, but if an
+				 * alternative candidate state has been found,
+				 * it may still turn out to be a better choice.
 				 */
-				duration_ns = last_enabled_span_ns;
-				idx = last_enabled_idx;
-				break;
-			}
+				if (last_enabled_idx != idx)
+					continue;
 
-			if ((!alt_recent || 2 * recent_sum > idx_recent_sum) &&
-			    (!alt_intercepts ||
-			     2 * intercept_sum > idx_intercept_sum)) {
-				idx = i;
-				duration_ns = span_ns;
 				break;
 			}