[MODERATED] Re: [patch V3 05/12] cpu/hotplug: Provide knobs to control SMT

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Jun 15, 2018 at 06:28:06PM +0200, speck for Thomas Gleixner wrote:
> Subject: [patch V3 05/12] cpu/hotplug: Provide knobs to control SMT
> From: Thomas Gleixner <tglx@linutronix.de>
> 
> Provide a command line and a sysfs knob to control SMT.
> 
> The command line options are:
> 
>  'nosmt':	Enumerate secondary threads, but do not online them
>  		
>  'nosmt=force': Ignore secondary threads completely during enumeration
>  		via MP table and ACPI/MADT.
> 
> The sysfs control file has the following states (read/write):
> 
>  'on':		SMT is enabled. Secondary threads can be freely onlined
>  'off':		SMT is disabled. Secondary threads, even if enumerated
>  		cannot be onlined
>  'forceoff':	SMT is permanentely disabled. Writes to the control
>  		file are rejected.
> 
> The command line option 'nosmt' sets the sysfs control to 'off'. This
> can be changed to 'on' to reenable SMT during runtime.
> 
> The command line option 'nosmt=force' sets the sysfs control to
> 'forceoff'. This cannot be changed during runtime.
> 
> When SMT is 'on' and the control file is changed to 'off' then all online
> secondary threads are offlined and attempts to online a secondary thread
> later are rejected.

s/later are/later on are/

With this change or not:

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Thank you!