Messages in this thread | | | Date | Wed, 20 Jul 2016 16:38:42 +0200 | From | Jiri Olsa <> | Subject | Re: Strange behavior of perf top with PEBS |
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On Wed, Jul 20, 2016 at 04:34:17PM +0200, 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.. > > I'll check why perf top forcing the precise for cycles > I thought we had that automated already
oops, too soon ;) we have:
perf/x86/intel: Fix Core2,Atom,NHM,WSM cycles:pp events commit 517e6341fa123ec3a2f9ea78ad547be910529881 Author: Peter Zijlstra <peterz@infradead.org> Date: Sat Apr 11 12:16:22 2015 +0200
so i guess it should work.. checking ;-)
jirka
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