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sched: Cleanup SCHED_THERMAL_PRESSURE kconfig entry

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As Russell pointed out [1], this option is severely lacking in the
documentation department, and figuring out if one has the required
dependencies to benefit from turning it on is not straightforward.

Make it non user-visible, and add a bit of help to it. While at it, make it
depend on CPU_FREQ_THERMAL.

[1]: https://lkml.kernel.org/r/20200603173150.GB1551@shell.armlinux.org.uk

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200712165917.9168-3-valentin.schneider@arm.com
This commit is contained in:
Valentin Schneider 2020-07-12 17:59:16 +01:00 committed by Peter Zijlstra
parent 25980c7a79
commit 98eb401d09
1 changed files with 14 additions and 1 deletions
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15
init/Kconfig
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@ -492,8 +492,21 @@ config HAVE_SCHED_AVG_IRQ
depends on SMP
config SCHED_THERMAL_PRESSURE
bool "Enable periodic averaging of thermal pressure"
bool
depends on SMP
depends on CPU_FREQ_THERMAL
help
Select this option to enable thermal pressure accounting in the
scheduler. Thermal pressure is the value conveyed to the scheduler
that reflects the reduction in CPU compute capacity resulted from
thermal throttling. Thermal throttling occurs when the performance of
a CPU is capped due to high operating temperatures.
If selected, the scheduler will be able to balance tasks accordingly,
i.e. put less load on throttled CPUs than on non/less throttled ones.
This requires the architecture to implement
arch_set_thermal_pressure() and arch_get_thermal_pressure().
config BSD_PROCESS_ACCT
bool "BSD Process Accounting"