On Thu, 31 Jul 2025 15:51:42 +0200, Friedrich Weber wrote:
> Pressure stall information are actually in percent. This is not
> mentioned explicitly in the documentation, but e.g. in the kernel
> source [1]:
>
> > The percentage of wall clock time spent in those compound stall
> > states gives pressure numbers between 0 and 100 for each resource,
> > where the SOME percentage indicates workload slowdowns and the FULL
> > percentage indicates reduced CPU utilization:
> >
> > %SOME = time(SOME) / period
> > %FULL = time(FULL) / period
>
> [...]
This was a bit strange for me, I seemingly ingrained some wrong knownledge when
getting first exposed to PSI when that was a new thing back in 2019 or so,
either the docs where worded a bit differently or I just read a bit to much
into the wording (more likely), anyhow thanks for clarifying this, one thing
that I'm still wondering is this then percent for real (i.e. * 100 already) or
a ratio? Or would we need to do *= 100 scaling?
Anyway, as this restores the status quo with rationale it's already an
improvement as is, so: Applied, thanks!
[1/1] ui: RRD graphs: display PSI as percent
commit: 2753e104a1e6effa4a0ae995f13636a02f3557af
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