* [PATCH] cpuidle: poll_state: Disregard disable idle states
@ 2018-12-03 12:32 Rafael J. Wysocki
0 siblings, 0 replies; only message in thread
From: Rafael J. Wysocki @ 2018-12-03 12:32 UTC (permalink / raw)
To: Linux PM
Cc: LKML, Linux Documentation, Peter Zijlstra, Daniel Lezcano,
Giovanni Gherdovich, Doug Smythies
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
When computing the limit of time to spend in the loop in poll_idle(),
use the target residency of the first enabled idle state deeper than
state 0 instead of always using the target residency of state 1.
This helps when state 1 is disabled for diagnostics, for instance.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/cpuidle/poll_state.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
Index: linux-pm/drivers/cpuidle/poll_state.c
===================================================================
--- linux-pm.orig/drivers/cpuidle/poll_state.c
+++ linux-pm/drivers/cpuidle/poll_state.c
@@ -20,8 +20,17 @@ static int __cpuidle poll_idle(struct cp
local_irq_enable();
if (!current_set_polling_and_test()) {
- u64 limit = (u64)drv->states[1].target_residency * NSEC_PER_USEC;
unsigned int loop_count = 0;
+ u64 limit = TICK_USEC;
+ int i;
+
+ for (i = 1; i < drv->state_count; i++) {
+ if (drv->states[i].disabled || dev->states_usage[i].disable)
+ continue;
+
+ limit = (u64)drv->states[i].target_residency * NSEC_PER_USEC;
+ break;
+ }
while (!need_resched()) {
cpu_relax();
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2018-12-03 12:32 [PATCH] cpuidle: poll_state: Disregard disable idle states Rafael J. Wysocki
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