Messages in this thread | | | Subject | Re: Strange behavior of perf top with PEBS | From | Nikolay Borisov <> | Date | Tue, 26 Jul 2016 14:30:46 +0300 |
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On 07/20/2016 05:38 PM, Jiri Olsa wrote: > 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 ;-)
Any update on that?
> > jirka >
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