Re: perf hw in kexeced kernel broken in tip

Don Zickus
2010-12-08T19:29:12Z

On Wed, Dec 08, 2010 at 10:43:14AM -0800, Yinghai Lu wrote:
>
> can you add sth force_... in command line to take over ownership of perf from BIOS or previous kernel ?
>
> then still can use perf etc after we kexec from RHEL or SLES kernel to later kernel ( from 2.6.37)

My understand is that you can't because the BIOS is actively using it
behind the scenes of the kernel (well during an SMI). I have a machine
where I tried to force take it but it still stopped triggering interrupts.

Cheers,
Don