[lttng-dev] PERF PARAMETERS

[Jessica Foest]

Thanks :)


2014-08-27 13:30 GMT-04:00 Julien Desfossez <jdesfossez at efficios.com>:

> Hi,
>
> On 14-08-26 11:21 PM, Jessica Foest wrote:
> > Hi
> >
> > i tried to retrieve system calls traces with all perf context parameters
> > . the problem is that only a few PERF counters are activated and lttng
> > fails to activate  the other perf context parameters.
> > how can i solve it ?
>
> There is a hardware limit on the number perf PMU counters that can be
> activated at the same time. It depends on the CPU and if you are on a
> virtual machine.
> If I remember correctly it is 3 or 4 on the i7.
>
> Julien
>
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