Re: [PATCH] sched: print information about scheduler granularity

[Jürgen Groß <jgross@xxxxxxxx>]

On 16.04.20 18:47, Dario Faggioli wrote:
> On Thu, 2020-04-16 at 11:25 +0200, Jürgen Groß wrote:
> > On 16.04.20 11:20, Sergey Dyasli wrote:
> > > On 16/04/2020 09:57, Jürgen Groß wrote:
> > > > The xen commandline ins part of the boot messages and is
> > > > contained
> > > > in the "xl info" output.
> > > It's true that you can see "sched-gran=core" in "xl info" output.
> > > But that's
> > > just the switch - not the end result. A user might want to verify
> > > that he did
> > > everything correctly and core-scheduling mode has indeed been
> > > enabled.
> > I'm not opposed to your patch, but as soon as we have per-cpupool
> > granularity it should be reverted again.
> Why reverted? Each cpupool dumps its own scheduling information. With
> per-pool granularity, we'll see something like
>
> cpupool: Pool-A
> Scheduler: SMP Credit Scheduler (credit)
> Scheduling granularity: cpu
> ...
> cpupool: Pool-B
> Scheduler: SMP Credit Scheduler (credit)
> Scheduling granularity: core
>
> etc.
>
> Or am I missing something?
"Reworking" might have been a better wording.

The patch is looking only at the global variable opt_sched_granularity
for deciding which granularity to print out.


Juergen