Messages in this thread Patch in this message | | | Date | Wed, 02 Aug 2023 15:24:36 +0200 | From | Peter Zijlstra <> | Subject | [RFC][PATCH v2 5/5] cpuidle,teo: Improve state selection |
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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 @@ -361,6 +361,7 @@ static int teo_select(struct cpuidle_dri unsigned int recent_sum = 0; unsigned int idx_hit_sum = 0; unsigned int hit_sum = 0; + unsigned int thresh_sum = 0; int constraint_idx = 0; int idx0 = 0, idx = -1; bool alt_intercepts, alt_recent; @@ -376,6 +377,8 @@ static int teo_select(struct cpuidle_dri duration_ns = tick_ns = tick_get_sleep_length(false); + 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 @@ -406,6 +409,9 @@ static int teo_select(struct cpuidle_dri if (s->target_residency_ns > duration_ns) break; + if (intercept_sum + hit_sum > thresh_sum) + break; + if (s->target_residency_ns == SHORT_TICK_NSEC) { /* * We hit the tick state, see if it makes sense to
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