Re: [PATCH v4 2/4] pps: Drop the !NO_HZ_COMMON dependency from NTP_PPS

[Rodolfo Giometti]

On Mon, 2026-09-28 at 14:37 +0100, David Woodhouse wrote:
> But I can *simulate* it, by running a virtual machine with vmclock and
> knowing the precise relationship of counter to real time that I'm
> *telling* it to discipline against — then checking how it did. Your "no
> independent reference anywhere" is my "I'm actually testing the part I
> want to test" :)

What it cannot show is the thing this patch actually enables: hardpps
on a tickless kernel driven by a real PPS source, with its jitter, its
IRQ latency, and the CPU going idle between pulses. If you (or someone
on Cc) can run it for a while with a GPS PPS on a GPIO and report how
the offset converges compared with a tickful kernel, that is the test
I would like to see mentioned in the commit message. If not, please at
least state there that the validation was done with the simulated 4/4
pulse only.

Ciao,

Rodolfo