Extrapolating on the exisiting 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_avg can be called to do the periodic bookeeping (accumulate, decay and average) of the thermal pressure.
Signed-off-by: Thara Gopinath <[email protected]> --- v3->v4: - Renamed update_thermal_avg to update_thermal_load_avg. - Fixed typos as per review comments on mailing list - Reordered the code as per review comments kernel/sched/pelt.c | 13 +++++++++++++ kernel/sched/pelt.h | 7 +++++++ kernel/sched/sched.h | 1 + 3 files changed, 21 insertions(+) diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c index a96db50..3821069 100644 --- a/kernel/sched/pelt.c +++ b/kernel/sched/pelt.c @@ -353,6 +353,19 @@ int update_dl_rq_load_avg(u64 now, struct rq *rq, int running) return 0; } +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); + 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 0db2c1b..d5d82c8 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
