From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thara Gopinath Subject: [RFC PATCH 2/7] sched/pelt.c: Add support to track thermal pressure Date: Tue, 9 Oct 2018 12:24:57 -0400 Message-ID: <1539102302-9057-3-git-send-email-thara.gopinath@linaro.org> References: <1539102302-9057-1-git-send-email-thara.gopinath@linaro.org> Return-path: In-Reply-To: <1539102302-9057-1-git-send-email-thara.gopinath@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, rui.zhang@intel.com Cc: gregkh@linuxfoundation.org, rafael@kernel.org, amit.kachhap@gmail.com, viresh.kumar@linaro.org, javi.merino@kernel.org, edubezval@gmail.com, daniel.lezcano@linaro.org, linux-pm@vger.kernel.org, quentin.perret@arm.com, ionela.voinescu@arm.com, vincent.guittot@linaro.org List-Id: linux-pm@vger.kernel.org Extrapolating on the exisitng framework to track rt/dl utilization using pelt signals, add a similar mechanism to track thermal pressue. 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. 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 --- kernel/sched/pelt.c | 14 ++++++++++++++ kernel/sched/pelt.h | 7 +++++++ kernel/sched/sched.h | 1 + 3 files changed, 22 insertions(+) diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c index 05b8798..7034ede 100644 --- a/kernel/sched/pelt.c +++ b/kernel/sched/pelt.c @@ -362,6 +362,20 @@ int update_dl_rq_load_avg(u64 now, struct rq *rq, int running) return 0; } +int update_thermal_avg(u64 now, struct rq *rq, u64 capacity) +{ + if (___update_load_sum(now, rq->cpu, &rq->avg_thermal, + capacity, + capacity, + capacity, 0)) { + + ___update_load_avg(&rq->avg_thermal, 1, 1); + return 1; + } + + return 0; +} + #if defined(CONFIG_IRQ_TIME_ACCOUNTING) || defined(CONFIG_PARAVIRT_TIME_ACCOUNTING) /* * irq: diff --git a/kernel/sched/pelt.h b/kernel/sched/pelt.h index d2894db..cc5a3ad 100644 --- a/kernel/sched/pelt.h +++ b/kernel/sched/pelt.h @@ -5,6 +5,7 @@ int __update_load_avg_se(u64 now, int cpu, struct cfs_rq *cfs_rq, struct sched_e int __update_load_avg_cfs_rq(u64 now, int cpu, 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_avg(u64 now, struct rq *rq, u64 capacity); #if defined(CONFIG_IRQ_TIME_ACCOUNTING) || defined(CONFIG_PARAVIRT_TIME_ACCOUNTING) int update_irq_load_avg(struct rq *rq, u64 running); @@ -67,6 +68,12 @@ update_irq_load_avg(struct rq *rq, u64 running) { return 0; } + +static inline int +update_thermal_avg(u64 now, struct rq *rq, u64 capacity) +{ + return 0; +} #endif diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 4a2e8ca..30b40a5 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -859,6 +859,7 @@ struct rq { #define HAVE_SCHED_AVG_IRQ struct sched_avg avg_irq; #endif + struct sched_avg avg_thermal; u64 idle_stamp; u64 avg_idle; -- 2.1.4