Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

Andi Kleen
2012-06-08T16:50:18Z

> Why do we have per-cpu firmware anyway?

Consider CPU hotplug. A newly plugged CPU is not updated yet, but will
be after hotplug.

However i suppose it would be possible to do the update early in the
boot up sequence before others can use it. That would avoid this problem.

-Andi