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Date: Wed, 3 Jun 2020 19:45:00 +0100 From: Russell King - ARM Linux admin <linux@...linux.org.uk> To: Valentin Schneider <valentin.schneider@....com> Cc: Thara Gopinath <thara.gopinath@...aro.org>, Vincent Guittot <vincent.guittot@...aro.org>, linux-kernel@...r.kernel.org Subject: Re: v5.7: new core kernel option missing help text On Wed, Jun 03, 2020 at 07:00:26PM +0100, Valentin Schneider wrote: > > On 03/06/20 18:31, Russell King - ARM Linux admin wrote: > > Hi, > > > > A new kernel configuration option ("SCHED_THERMAL_PRESSURE") was > > recently added, but has no help text. This is most unhelpful when > > trying to configure the kernel, since one does not know what the > > effect of answering yes or no to this option would be. > > > > Please supply a proper help text when adding core kernel options > > so that people can make an informed decision when answering the > > prompt, rather than just guessing. > > > > Right; does the below look good enough? It's a start. I'm still wondering whether I should answer yes or no for the platforms I'm building for. So far, all I've found is: arch/arm/include/asm/topology.h:#define arch_scale_thermal_pressure topology_get_thermal_pressure which really doesn't tell me anything about this. So I'm still in the dark. I guess topology_get_thermal_pressure is provided by something in drivers/ which will be conditional on some driver or something. > > --- > diff --git a/init/Kconfig b/init/Kconfig > index 74a5ac65644f..f40cf852d00a 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -441,6 +441,10 @@ config HAVE_SCHED_AVG_IRQ > config SCHED_THERMAL_PRESSURE > bool "Enable periodic averaging of thermal pressure" > depends on SMP > + help > + This option allows the scheduler to be aware of CPU thermal throttling > + (i.e. thermal pressure), providing arch_scale_thermal_pressure() is > + implemented. > > config BSD_PROCESS_ACCT > bool "BSD Process Accounting" > --- > -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC for 0.8m (est. 1762m) line in suburbia: sync at 13.1Mbps down 424kbps up
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