Messages in this thread | | | Date | Wed, 08 Dec 2010 11:05:57 -0800 | From | Yinghai Lu <> | Subject | Re: perf hw in kexeced kernel broken in tip |
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On 12/08/2010 11:01 AM, Don Zickus wrote: > 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.
how about second case: kexec from RHEL 6 stock kernel to upstream kernel ?
Thanks
Yinghai
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