Messages in this thread | | | Date | Mon, 30 Jun 2014 15:22:24 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH v2] perf/x86/intel: ignore CondChgd bit to avoid false NMI handling |
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> > I'm also interested in the behaviour of CondChgd bit on Ivy Bridge processors.
The intended meaning of CondChgd is that a hardware debugger has taken over the PMU. It shouldn't really be set in other circumstances.
I think right now for perf it would be best to just ignore it.
In theory could stop using the PMU, but if some BIOS set it it would completely disable perf there. So better to just ignore it.
-Andi
-- ak@linux.intel.com -- Speaking for myself only
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