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DateWed, 8 Dec 2010 14:01:58 -0500
FromDon Zickus <>
SubjectRe: perf hw in kexeced kernel broken in tip
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


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