Re: [PATCH] powerpc/powernv: Add kernel cmdline parameter to disable imc

[Madhavan Srinivasan]

On Thursday 12 October 2017 01:21 PM, Stewart Smith wrote:
> Anju T Sudhakar <anju@xxxxxxxxxxxxxxxxxx> writes:
> > On Wednesday 11 October 2017 01:55 AM, Stewart Smith wrote:
> > > Michael Ellerman <mpe@xxxxxxxxxxxxxx> writes:
> > > > Anju T Sudhakar <anju@xxxxxxxxxxxxxxxxxx> writes:
> > > >
> > > > > Add a kernel command line parameter option to disable In-Memory Collection
> > > > > (IMC) counters and add documentation. This helps in debug.
> > > > I'd really rather we didn't. Do we *really* need this?
> > > >
> > > > We don't have command line parameters to disable any of the other ~20
> > > > PMUs, why is this one special?
> > This one is really helpful in debugging, incase if we want to proceed
> > without nest counters OR
> > core counters . But if we have the facility to do the same from
> > petitboot, its fine.
> https://patchwork.ozlabs.org/patch/824497/ (skiboot patch) should do the
> same thing, right? That means we come up with them off (as we should
> have from the start) and if you don't use the PMUs then the ucode won't
> be started.
Stewart,

Thats right. With that skiboot patch, IMC will be paused at start.