On Sun, Jul 12, 2020 at 05:59:16PM +0100, Valentin Schneider wrote: > 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/[email protected] > > Signed-off-by: Valentin Schneider <[email protected]> > --- > init/Kconfig | 15 ++++++++++++++- > 1 file changed, 14 insertions(+), 1 deletion(-) > > diff --git a/init/Kconfig b/init/Kconfig > index 0498af567f70..0a97d85568b2 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -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" > --
On arm64 linux-next (20200727), https://gitlab.com/cailca/linux-mm/-/blob/master/arm64.config WARNING: unmet direct dependencies detected for SCHED_THERMAL_PRESSURE Depends on [n]: SMP [=y] && CPU_FREQ_THERMAL [=n] Selected by [y]: - ARM64 [=y]
