From: "tip-bot2 for Thara Gopinath" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
Thara Gopinath <thara.gopinath@linaro.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, x86 <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: [tip: sched/core] sched/pelt: Add support to track thermal pressure
Date: Fri, 06 Mar 2020 14:42:11 -0000 [thread overview]
Message-ID: <158350573124.28353.7802371753363408650.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20200222005213.3873-2-thara.gopinath@linaro.org>
The following commit has been merged into the sched/core branch of tip:
Commit-ID: 765047932f153265db6ef15be208d6cbfc03dc62
Gitweb: https://git.kernel.org/tip/765047932f153265db6ef15be208d6cbfc03dc62
Author: Thara Gopinath <thara.gopinath@linaro.org>
AuthorDate: Fri, 21 Feb 2020 19:52:05 -05:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Fri, 06 Mar 2020 12:57:17 +01:00
sched/pelt: Add support to track thermal pressure
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 time "delta" capacity unlike util_avg
which 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.
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
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/20200222005213.3873-2-thara.gopinath@linaro.org
---
include/trace/events/sched.h | 4 ++++
init/Kconfig | 4 ++++
kernel/sched/pelt.c | 31 +++++++++++++++++++++++++++++++
kernel/sched/pelt.h | 31 +++++++++++++++++++++++++++++++
kernel/sched/sched.h | 3 +++
5 files changed, 73 insertions(+)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 9c3ebb7..ed168b0 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -618,6 +618,10 @@ 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/init/Kconfig b/init/Kconfig
index 20a6ac3..275c848 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -451,6 +451,10 @@ config HAVE_SCHED_AVG_IRQ
depends on IRQ_TIME_ACCOUNTING || PARAVIRT_TIME_ACCOUNTING
depends on SMP
+config SCHED_THERMAL_PRESSURE
+ bool "Enable periodic averaging of thermal pressure"
+ depends on SMP
+
config BSD_PROCESS_ACCT
bool "BSD Process Accounting"
depends on MULTIUSER
diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c
index c40d57a..b647d04 100644
--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@@ -368,6 +368,37 @@ int update_dl_rq_load_avg(u64 now, struct rq *rq, int running)
return 0;
}
+#ifdef CONFIG_SCHED_THERMAL_PRESSURE
+/*
+ * thermal:
+ *
+ * load_sum = \Sum se->avg.load_sum but se->avg.load_sum is not tracked
+ *
+ * util_avg and runnable_load_avg are not supported and meaningless.
+ *
+ * Unlike rt/dl utilization tracking that track 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
+ * time weighted "delta" capacity unlike util_avg which is binary.
+ * "delta capacity" = actual capacity -
+ * capped capacity a cpu due to a thermal event.
+ */
+
+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);
+ trace_pelt_thermal_tp(rq);
+ return 1;
+ }
+
+ return 0;
+}
+#endif
+
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
/*
* irq:
diff --git a/kernel/sched/pelt.h b/kernel/sched/pelt.h
index afff644..eb034d9 100644
--- a/kernel/sched/pelt.h
+++ b/kernel/sched/pelt.h
@@ -7,6 +7,26 @@ 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);
+#ifdef CONFIG_SCHED_THERMAL_PRESSURE
+int update_thermal_load_avg(u64 now, struct rq *rq, u64 capacity);
+
+static inline u64 thermal_load_avg(struct rq *rq)
+{
+ return READ_ONCE(rq->avg_thermal.load_avg);
+}
+#else
+static inline int
+update_thermal_load_avg(u64 now, struct rq *rq, u64 capacity)
+{
+ return 0;
+}
+
+static inline u64 thermal_load_avg(struct rq *rq)
+{
+ return 0;
+}
+#endif
+
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
int update_irq_load_avg(struct rq *rq, u64 running);
#else
@@ -159,6 +179,17 @@ 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 u64 thermal_load_avg(struct rq *rq)
+{
+ 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 2a0caf3..6c839f8 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -961,6 +961,9 @@ struct rq {
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
struct sched_avg avg_irq;
#endif
+#ifdef CONFIG_SCHED_THERMAL_PRESSURE
+ struct sched_avg avg_thermal;
+#endif
u64 idle_stamp;
u64 avg_idle;
next prev parent reply other threads:[~2020-03-06 14:42 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-22 0:52 [Patch v10 0/9] Introduce Thermal Pressure Thara Gopinath
2020-02-22 0:52 ` [Patch v10 1/9] sched/pelt: Add support to track thermal pressure Thara Gopinath
2020-02-22 0:59 ` Randy Dunlap
2020-02-22 18:27 ` Thara Gopinath
2020-02-22 18:50 ` Randy Dunlap
2020-02-24 14:33 ` Thara Gopinath
2020-02-25 15:47 ` Peter Zijlstra
2020-02-25 16:43 ` Thara Gopinath
2020-03-06 14:42 ` tip-bot2 for Thara Gopinath [this message]
2020-02-22 0:52 ` [Patch v10 2/9] sched/topology: Add hook to read per cpu " Thara Gopinath
2020-03-06 14:42 ` [tip: sched/core] sched/topology: Add callback to read per CPU " tip-bot2 for Thara Gopinath
2020-02-22 0:52 ` [Patch v10 3/9] drivers/base/arch_topology: Add infrastructure to store and update instantaneous " Thara Gopinath
2020-03-06 14:42 ` [tip: sched/core] " tip-bot2 for Thara Gopinath
2020-02-22 0:52 ` [Patch v10 4/9] arm64/topology: Populate arch_scale_thermal_pressure for arm64 platforms Thara Gopinath
2020-03-06 14:42 ` [tip: sched/core] arm64/topology: Populate arch_scale_thermal_pressure() " tip-bot2 for Thara Gopinath
2020-02-22 0:52 ` [Patch v10 5/9] arm/topology: Populate arch_scale_thermal_pressure for arm platforms Thara Gopinath
2020-03-06 14:42 ` [tip: sched/core] arm/topology: Populate arch_scale_thermal_pressure() for ARM platforms tip-bot2 for Thara Gopinath
2020-02-22 0:52 ` [Patch v10 6/9] sched/fair: Enable periodic update of average thermal pressure Thara Gopinath
2020-02-27 9:03 ` Amit Kucheria
2020-03-06 14:42 ` [tip: sched/core] " tip-bot2 for Thara Gopinath
2020-02-22 0:52 ` [Patch v10 7/9] sched/fair: update cpu_capacity to reflect " Thara Gopinath
2020-03-06 14:42 ` [tip: sched/core] sched/fair: Update " tip-bot2 for Thara Gopinath
2020-02-22 0:52 ` [Patch v10 8/9] thermal/cpu-cooling: Update thermal pressure in case of a maximum frequency capping Thara Gopinath
2020-03-06 14:42 ` [tip: sched/core] " tip-bot2 for Thara Gopinath
2020-02-22 0:52 ` [Patch v10 9/9] sched/fair: Enable tuning of decay period Thara Gopinath
2020-03-06 14:42 ` [tip: sched/core] " tip-bot2 for Thara Gopinath
2020-02-27 9:01 ` [Patch v10 0/9] Introduce Thermal Pressure Amit Kucheria
[not found] ` <CAP=VYLqWfqOZT6ec9cKyKOsOhu7HhVn2f_eU+ca006i4CV8R-w@mail.gmail.com>
2020-04-16 13:40 ` Thara Gopinath
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