RFC: Hiding per-CPU kernel output behind bootverbose

[Colin Percival]

On large systems (e.g., EC2's x1e.32xlarge instance type, with 128 vCPUs)
the boot time console output contains a large number of lines of the forms

SMP: AP CPU #N Launched!
cpuN: <ACPI CPU> on acpi0
estN: <Enhanced SpeedStep Frequency Control> on cpuN

Having 128 almost-identical lines of output doesn't seem very useful, and
it actually has a nontrivial impact on the time spent booting.

Does anyone mind if I hide these by default, having them only show up if
boot verbosity is requested?

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid