Messages in this thread | | | Date | Mon, 21 Nov 2011 20:04:02 +0100 | Subject | Re: [tip:perf/urgent] perf/x86: Enable raw event access to Intel offcore events | From | Stephane Eranian <> |
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Vince,
On Mon, Nov 21, 2011 at 8:01 PM, Vince Weaver <vweaver1@eecs.utk.edu> wrote: > On Mon, 21 Nov 2011, Peter Zijlstra wrote: >> On Mon, 2011-11-21 at 13:24 -0500, Vince Weaver wrote: > >> > Now I'll have to find something else >> > to complain about, probably the scedulability issue introduced with the >> > NMI watchdog. >> >> But you can disable that thing, right? >> >> echo 0 > /proc/sys/kernel/nmi_watchdog; >> >> or so should do the trick. > > yes, if the user running PAPI has root. > > That's unfortunately not always the case, and sometimes people want to > have both the NMI watchdog operating and use PAPI simultaneously. >
I don't understand why you have a problem with NMI watchdog. Multiplexing allows you to still measure more events than there are counters.
> We have a workaround, but it currently disables kernel multiplexing and a > few other nice features. > > Vince > vweaver1@eecs.utk.edu > >
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