diff options
Diffstat (limited to 'drivers/cpuidle/governors')
| -rw-r--r-- | drivers/cpuidle/governors/teo.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/drivers/cpuidle/governors/teo.c b/drivers/cpuidle/governors/teo.c index b33418f5df70..f5dfeed77f0a 100644 --- a/drivers/cpuidle/governors/teo.c +++ b/drivers/cpuidle/governors/teo.c @@ -239,7 +239,7 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, s64 latency_req = cpuidle_governor_latency_req(dev->cpu); u64 duration_ns; unsigned int hits, misses, early_hits; - int max_early_idx, constraint_idx, idx, i; + int max_early_idx, prev_max_early_idx, constraint_idx, idx, i; ktime_t delta_tick; if (dev->last_state_idx >= 0) { @@ -256,6 +256,7 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, misses = 0; early_hits = 0; max_early_idx = -1; + prev_max_early_idx = -1; constraint_idx = drv->state_count; idx = -1; @@ -307,6 +308,7 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, */ if (!(tick_nohz_tick_stopped() && drv->states[idx].target_residency_ns < TICK_NSEC)) { + prev_max_early_idx = max_early_idx; early_hits = cpu_data->states[i].early_hits; max_early_idx = idx; } @@ -333,6 +335,7 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, if (early_hits < cpu_data->states[i].early_hits && !(tick_nohz_tick_stopped() && drv->states[i].target_residency_ns < TICK_NSEC)) { + prev_max_early_idx = max_early_idx; early_hits = cpu_data->states[i].early_hits; max_early_idx = i; } @@ -346,9 +349,19 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, * "early hits" metric, but if that cannot be determined, just use the * state selected so far. */ - if (hits <= misses && max_early_idx >= 0) { - idx = max_early_idx; - duration_ns = drv->states[idx].target_residency_ns; + if (hits <= misses) { + /* + * The current candidate state is not suitable, so take the one + * whose "early hits" metric is the maximum for the range of + * shallower states. + */ + if (idx == max_early_idx) + max_early_idx = prev_max_early_idx; + + if (max_early_idx >= 0) { + idx = max_early_idx; + duration_ns = drv->states[idx].target_residency_ns; + } } /* |