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sched/fair: Enable periodic update of average thermal pressure 

Introduce support in scheduler periodic tick and other CFS bookkeeping
APIs to trigger the process of computing average thermal pressure for a
CPU. Also consider avg_thermal.load_avg in others_have_blocked which
allows for decay of pelt signals.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200222005213.3873-7-thara.gopinath@linaro.org
This commit is contained in:
Thara Gopinath 2020-02-21 19:52:10 -05:00 committed by Ingo Molnar
parent 8eab879c54
commit b4eccf5f8e
2 changed files with 10 additions and 0 deletions
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3
kernel/sched/core.c
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@ -3586,6 +3586,7 @@ void scheduler_tick(void)
struct rq *rq = cpu_rq(cpu);
struct task_struct *curr = rq->curr;
struct rq_flags rf;
unsigned long thermal_pressure;
arch_scale_freq_tick();
sched_clock_tick();
@ -3593,6 +3594,8 @@ void scheduler_tick(void)
rq_lock(rq, &rf);
update_rq_clock(rq);
thermal_pressure = arch_scale_thermal_pressure(cpu_of(rq));
update_thermal_load_avg(rq_clock_task(rq), rq, thermal_pressure);
curr->sched_class->task_tick(rq, curr, 0);
calc_global_load_tick(rq);
psi_task_tick(rq);

7
kernel/sched/fair.c
View File

@ -7719,6 +7719,9 @@ static inline bool others_have_blocked(struct rq *rq)
if (READ_ONCE(rq->avg_dl.util_avg))
return true;
if (thermal_load_avg(rq))
return true;
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
if (READ_ONCE(rq->avg_irq.util_avg))
return true;
@ -7744,6 +7747,7 @@ static bool __update_blocked_others(struct rq *rq, bool *done)
{
const struct sched_class *curr_class;
u64 now = rq_clock_pelt(rq);
unsigned long thermal_pressure;
bool decayed;
/*
@ -7752,8 +7756,11 @@ static bool __update_blocked_others(struct rq *rq, bool *done)
*/
curr_class = rq->curr->sched_class;
thermal_pressure = arch_scale_thermal_pressure(cpu_of(rq));
decayed = update_rt_rq_load_avg(now, rq, curr_class == &rt_sched_class) |
update_dl_rq_load_avg(now, rq, curr_class == &dl_sched_class) |
update_thermal_load_avg(rq_clock_task(rq), rq, thermal_pressure) |
update_irq_load_avg(rq, 0);
if (others_have_blocked(rq))