On 07/20/2016 05:34 PM, Jiri Olsa wrote: > 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..
FYI running perf top -e instructions:p also produces no data on that particular CPU. > > I'll check why perf top forcing the precise for cycles > I thought we had that automated already > > jirka >