Re: Strange behavior of perf top with PEBS

[Jiri Olsa]

On Wed, Jul 20, 2016 at 04:28:34PM +0300, Nikolay Borisov wrote:
> Hello,
> 
> Running perf version 4.4.14.g0cb188d (no modification to the PMU/perf
> code) I observed that "perf top" counts no cycles and produces no
> output. After a bit of head scratching and testing I figured that
> running "perf top -e cycles" actually works whereas the default option
> is equivalent to running "perf top -e cycles:p". So the latter version
> seems to not work on my machine.

hum, I think Core2 has PEBs valid only for instructions not cycles..

I'll check why perf top forcing the precise for cycles
I thought we had that automated already

jirka