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Yield while spinning on APs and avoid announcing all CPUs unless bootverbose

Description

Yield while spinning on APs and avoid announcing all CPUs unless bootverbose
is set. These improve startup performance on massively multithreaded systems
with 8-way SMT and dozens to hundreds of CPUs.

MFC after: 3 weeks

Details

Provenance
nwhitehornAuthored on
Parents
rS326205: Whether you can use mttb() or not is more complicated than whether PSL_HV
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