Messages in this thread | | | Date | Wed, 25 Apr 2018 16:59:20 +0200 | From | Jiri Olsa <> | Subject | Re: [V2 PATCH] perf parse-events: Specially handle uncore event alias in small groups |
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On Wed, Apr 25, 2018 at 10:42:27AM -0400, Liang, Kan wrote: > > > On 4/25/2018 10:23 AM, Jiri Olsa wrote: > > On Wed, Apr 25, 2018 at 06:50:18AM -0700, kan.liang@linux.intel.com wrote: > > > From: Kan Liang <kan.liang@linux.intel.com> > > > > > > Perf stat doesn't count the uncore event aliases from the same uncore > > > block in a group, for example: > > > > > > perf stat -e '{unc_m_cas_count.all,unc_m_clockticks}' -a -I 1000 > > > # time counts unit events > > > 1.000447342 <not counted> unc_m_cas_count.all > > > 1.000447342 <not counted> unc_m_clockticks > > > 2.000740654 <not counted> unc_m_cas_count.all > > > 2.000740654 <not counted> unc_m_clockticks > > > > > > The output is very misleading. It gives a wrong impression that the > > > uncore event doesn't work. > > > > > > An uncore block could be composed by several PMUs. An uncore event alias > > > is a joint name which means the same event runs on all PMUs of a block. > > > Perf doesn't support mixed events from different PMUs in the same group. > > > It is wrong to put uncore event aliases in a big group. > > > > > > The right way is to split the big group into multiple small groups which > > > only include the events from the same PMU. > > > Only uncore event aliases from the same uncore block should be specially > > > handled here. It doesn't make sense to mix the uncore events with other > > > uncore events from different blocks or even core events in a group. > > > > > > With the patch: > > > # time counts unit events > > > 1.001557653 140,833 unc_m_cas_count.all > > > 1.001557653 1,330,231,332 unc_m_clockticks > > > 2.002709483 85,007 unc_m_cas_count.all > > > 2.002709483 1,429,494,563 unc_m_clockticks > > > > hum, I still can see the original behaviour even with the patch: > > > > That's because the data_reads and clockticks are from different uncore > blocks. The data_reads is a IMC event. The clockticks is a CBOX event. > > The patch only supports the events from the same uncore blocks in group.
I see, found another example from same uncore blocks and it seems to work: # perf stat -e '{cas_count_read,cas_count_write}' -a -I 1000
but I have it aborted on: # ./perf stat -e '{cas_count_read,cas_count_write,cas_count_read}' -a -I 1000 perf: util/evsel.c:1483: get_group_fd: Assertion `!(!leader->fd)' failed. Aborted (core dumped)
jirka
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