Re: [PATCH v3] printk: fix zero-valued printk timestamps in early boot

Thomas Gleixner
2026-04-01T09:19:22Z

Brian!

On Tue, Mar 31 2026 at 21:16, Brian Masney wrote:
> With this patch set, on a 32GB RAM arm64 system we have the linear map
> creation time went from ~350ms to 25ms. Again, the boot time was all
> reported as 0 in dmesg.

Impressive!

> What Tim is trying to do is to identify if we have points like this on
> other systems, or if boot regressions are introduced in the future.

I completely understand that and as I clearly said from the very
beginning I'm not trying to prevent that at all.

What I'm arguing against is the approach of creating an ad hoc wart in
printk as that's creating yet another long term maintenance burden.

Thanks,

tglx