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| author | Thara Gopinath <thara.gopinath@linaro.org> | 2020-02-21 19:52:05 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-03-06 12:57:17 +0100 |
| commit | 765047932f153265db6ef15be208d6cbfc03dc62 (patch) | |
| tree | 49fd26bb4ce13c8af9bbdde8bf4ce9ed70f62565 /init/Kconfig | |
| parent | f1dfdab694eb3838ac26f4b73695929c07d92a33 (diff) | |
| download | lwn-765047932f153265db6ef15be208d6cbfc03dc62.tar.gz lwn-765047932f153265db6ef15be208d6cbfc03dc62.zip | |
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
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 20a6ac33761c..275c848b02c6 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 |