Messages in this thread Patch in this message |  | | From | Thara Gopinath <> | Subject | [Patch v6 1/7] sched/pelt.c: Add support to track thermal pressure | Date | Wed, 11 Dec 2019 23:11:42 -0500 |
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Extrapolating on the existing framework to track rt/dl utilization using pelt signals, add a similar mechanism to track thermal pressure. The difference here from rt/dl utilization tracking is that, instead of tracking time spent by a cpu running a rt/dl task through util_avg, the average thermal pressure is tracked through load_avg. This is because thermal pressure signal is weighted "delta" capacity and is not binary(util_avg is binary). "delta capacity" here means delta between the actual capacity of a cpu and the decreased capacity a cpu due to a thermal event.
In order to track average thermal pressure, a new sched_avg variable avg_thermal is introduced. Function update_thermal_load_avg can be called to do the periodic bookkeeping (accumulate, decay and average) of the thermal pressure.
Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org> ---
v5->v6: - added trace support for thermal pressure pelt signal.
include/trace/events/sched.h | 4 ++++ kernel/sched/pelt.c | 22 ++++++++++++++++++++++ kernel/sched/pelt.h | 7 +++++++ kernel/sched/sched.h | 1 + 4 files changed, 34 insertions(+)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 420e80e..a8fb667 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -613,6 +613,10 @@ DECLARE_TRACE(pelt_dl_tp, TP_PROTO(struct rq *rq), TP_ARGS(rq)); +DECLARE_TRACE(pelt_thermal_tp, + TP_PROTO(struct rq *rq), + TP_ARGS(rq)); + DECLARE_TRACE(pelt_irq_tp, TP_PROTO(struct rq *rq), TP_ARGS(rq)); diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c index a96db50..9aac3b7 100644 --- a/kernel/sched/pelt.c +++ b/kernel/sched/pelt.c @@ -353,6 +353,28 @@ int update_dl_rq_load_avg(u64 now, struct rq *rq, int running) return 0; } +/* + * thermal: + * + * load_sum = \Sum se->avg.load_sum + * + * util_avg and runnable_load_avg are not supported and meaningless. + * + */ +int update_thermal_load_avg(u64 now, struct rq *rq, u64 capacity) +{ + if (___update_load_sum(now, &rq->avg_thermal, + capacity, + capacity, + capacity)) { + ___update_load_avg(&rq->avg_thermal, 1, 1); + trace_pelt_thermal_tp(rq); + return 1; + } + + return 0; +} + #ifdef CONFIG_HAVE_SCHED_AVG_IRQ /* * irq: diff --git a/kernel/sched/pelt.h b/kernel/sched/pelt.h index afff644..c74226d 100644 --- a/kernel/sched/pelt.h +++ b/kernel/sched/pelt.h @@ -6,6 +6,7 @@ int __update_load_avg_se(u64 now, struct cfs_rq *cfs_rq, struct sched_entity *se int __update_load_avg_cfs_rq(u64 now, struct cfs_rq *cfs_rq); int update_rt_rq_load_avg(u64 now, struct rq *rq, int running); int update_dl_rq_load_avg(u64 now, struct rq *rq, int running); +int update_thermal_load_avg(u64 now, struct rq *rq, u64 capacity); #ifdef CONFIG_HAVE_SCHED_AVG_IRQ int update_irq_load_avg(struct rq *rq, u64 running); @@ -159,6 +160,12 @@ update_dl_rq_load_avg(u64 now, struct rq *rq, int running) } static inline int +update_thermal_load_avg(u64 now, struct rq *rq, u64 capacity) +{ + return 0; +} + +static inline int update_irq_load_avg(struct rq *rq, u64 running) { return 0; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 280a3c7..37bd7ef 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -944,6 +944,7 @@ struct rq { #ifdef CONFIG_HAVE_SCHED_AVG_IRQ struct sched_avg avg_irq; #endif + struct sched_avg avg_thermal; u64 idle_stamp; u64 avg_idle; -- 2.1.4
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