Hi Peter, Vince On Fri, Aug 19, 2016 at 12:01:30PM +0200, Peter Zijlstra wrote: > On Thu, Aug 18, 2016 at 10:46:31AM -0400, Vince Weaver wrote: > > On Thu, 18 Aug 2016, Vince Weaver wrote: > > > > > Tried the perf_fuzzer on my A10 fam15h/model13h system with 4.8-rc2 and it > > > falls over more or less immediately. > > > > > > This maps to variable_test_bit() > > > called by ctx = find_get_context(pmu, task, event); > > > in kernel/events/core.c:9467 > > > > > > It happens quickly enough I can probably track down the exact event that > > > causes this, if needed. > > > > I have a one line reproducer: > > > > perf stat -a -e amd_nb/config=0x37,config1=0x20/ /bin/ls > > OK, cannot reproduce on my fam15h/model1h. I'll go dig through the > various manuals to see if I can spot the fail. > > Huang could you either prod someone at AMD or do yourself, audit the AMD > perf code for all the various new models?
Actually, there might be some NBPMC event changes between model 0h-fh and model 10h-1fh. Below are the documents of these two processors: http://support.amd.com/TechDocs/42301_15h_Mod_00h-0Fh_BKDG.pdf http://support.amd.com/TechDocs/42300_15h_Mod_10h-1Fh_BKDG.pdf In section 3.16, it describes usage of NB Performance Counter Events. Hope it helps. :-) Thanks, Rui
