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Subject[RFC][PATCH 3/3] cpuidle,teo: Improve state selection
When selecting a state, stop when history tells us 66% of recent idles
were at or below our current state.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
drivers/cpuidle/governors/teo.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/cpuidle/governors/teo.c
+++ b/drivers/cpuidle/governors/teo.c
@@ -363,6 +363,7 @@ static int teo_select(struct cpuidle_dri
unsigned int idx_hit_sum = 0;
unsigned int hit_sum = 0;
unsigned int tick_sum = 0;
+ unsigned int thresh_sum = 0;
int constraint_idx = 0;
int idx0 = 0, idx = -1;
bool alt_intercepts, alt_recent;
@@ -397,6 +398,8 @@ static int teo_select(struct cpuidle_dri
duration_ns = tick_nohz_get_sleep_length(&delta_tick);
cpu_data->sleep_length_ns = duration_ns;

+ thresh_sum = 2 * cpu_data->total / 3; /* 66% */
+
/*
* Find the deepest idle state whose target residency does not exceed
* the current sleep length and the deepest idle state not deeper than
@@ -427,6 +430,9 @@ static int teo_select(struct cpuidle_dri
if (s->target_residency_ns > duration_ns)
break;

+ if (intercept_sum + hit_sum > thresh_sum)
+ break;
+
idx = i;

if (s->exit_latency_ns <= latency_req)

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