From: "Rafael J. Wysocki" rafael.j.wysocki@intel.com
mainline inclusion from mainline-v5.5-rc1 commit: e43dcf2 category: bugfix bugzilla: 38291 CVE: NA
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The TEO governor uses idle duration "bins" defined in accordance with the CPU idle states table provided by the driver, so that each "bin" covers the idle duration range between the target residency of the idle state corresponding to it and the target residency of the closest deeper idle state. The governor collects statistics for each bin regardless of whether or not the idle state corresponding to it is currently enabled.
In particular, the "hits" and "misses" metrics measure the likelihood of a situation in which both the time till the next timer (sleep length) and the idle duration measured after wakeup fall into the given bin. Namely, if the "hits" value is greater than the "misses" one, that situation is more likely than the one in which the sleep length falls into the given bin, but the idle duration measured after wakeup falls into a bin corresponding to one of the shallower idle states.
If the idle state corresponding to the given bin is disabled, it cannot be selected and if it turns out to be the one that should be selected, a shallower idle state needs to be used instead of it. Nevertheless, the metrics collected for the bin corresponding to it are still valid and need to be taken into account as though that state had not been disabled.
For this reason, make teo_select() always use the "hits" and "misses" values of the idle duration range that the sleep length falls into even if the specific idle state corresponding to it is disabled and if the "hits" values is greater than the "misses" one, select the closest enabled shallower idle state in that case.
Fixes: b26bf6ab716f ("cpuidle: New timer events oriented governor for tickless systems") Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Cc: 5.1+ stable@vger.kernel.org # 5.1+ Signed-off-by: Xiongfeng Wang wangxiongfeng2@huawei.com Reviewed-by: Hanjun Guo guohanjun@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/cpuidle/governors/teo.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/drivers/cpuidle/governors/teo.c b/drivers/cpuidle/governors/teo.c index 107def1a129a..cf3f8c883447 100644 --- a/drivers/cpuidle/governors/teo.c +++ b/drivers/cpuidle/governors/teo.c @@ -233,7 +233,7 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, { struct teo_cpu *cpu_data = per_cpu_ptr(&teo_cpus, dev->cpu); int latency_req = cpuidle_governor_latency_req(dev->cpu); - unsigned int duration_us, early_hits; + unsigned int duration_us, hits, misses, early_hits; int max_early_idx, constraint_idx, idx, i; ktime_t delta_tick;
@@ -247,6 +247,8 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, cpu_data->sleep_length_ns = tick_nohz_get_sleep_length(&delta_tick); duration_us = ktime_to_us(cpu_data->sleep_length_ns);
+ hits = 0; + misses = 0; early_hits = 0; max_early_idx = -1; constraint_idx = drv->state_count; @@ -264,6 +266,17 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, if (s->target_residency > duration_us) continue;
+ /* + * This state is disabled, so the range of idle duration + * values corresponding to it is covered by the current + * candidate state, but still the "hits" and "misses" + * metrics of the disabled state need to be used to + * decide whether or not the state covering the range in + * question is good enough. + */ + hits = cpu_data->states[i].hits; + misses = cpu_data->states[i].misses; + /* * If the "early hits" metric of a disabled state is * greater than the current maximum, it should be taken @@ -280,8 +293,11 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, continue; }
- if (idx < 0) + if (idx < 0) { idx = i; /* first enabled state */ + hits = cpu_data->states[i].hits; + misses = cpu_data->states[i].misses; + }
if (s->target_residency > duration_us) break; @@ -290,6 +306,8 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, constraint_idx = i;
idx = i; + hits = cpu_data->states[i].hits; + misses = cpu_data->states[i].misses;
if (early_hits < cpu_data->states[i].early_hits && !(tick_nohz_tick_stopped() && @@ -307,8 +325,7 @@ 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 (cpu_data->states[idx].hits <= cpu_data->states[idx].misses && - max_early_idx >= 0) { + if (hits <= misses && max_early_idx >= 0) { idx = max_early_idx; duration_us = drv->states[idx].target_residency; }