On Mon, Jun 30, 2014 at 03:22:24PM -0700, Andi Kleen wrote: > > > > 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.
Interesting. My concern is we have customers that can soft reboot a machine and have this bit accidentally be enabled. I am pretty sure they do not have a hardware debugger attached (I would have to double check). Is there other ways this can be set? Cheers, Don > > 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 > > -- > a...@linux.intel.com -- Speaking for myself only -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
