Messages in this thread | | | Subject | Re: [PATCH v2 0/6] perf arm64 metricgroup support | From | kajoljain <> | Date | Tue, 30 Mar 2021 12:11:37 +0530 |
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On 3/30/21 2:37 AM, Paul A. Clarke wrote: > On Fri, Mar 26, 2021 at 10:57:40AM +0000, John Garry wrote: >> On 25/03/2021 20:39, Paul A. Clarke wrote: >>> On Thu, Mar 25, 2021 at 06:33:12PM +0800, John Garry wrote: >>>> Metric reuse support is added for pmu-events parse metric testcase. >>>> This had been broken on power9 recentlty: >>>> https://lore.kernel.org/lkml/20210324015418.GC8931@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com/ >>> >>> Much better. Before: >>> -- >>> $ perf test -v 10 2>&1 | grep -i error | wc -l >>> 112 >>> -- >>> After: >>> -- >>> $ perf test -v 10 2>&1 | grep -i error | wc -l >>> 17 >>> -- >>> >>> And these seem like different types of issues: >>> -- >>> $ perf test -v 10 2>&1 | grep -i error >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_powerbus0_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)' >>> -- >>> >> >> This looks suspicious. >> >> Firstly, does /sys/bus/event_source/devices/nest_mcs01_imc (or others, >> above) exist on your system? I guess not. >> >> Secondly, checking Documentation/powerpc/imc.rst, we have examples of: >> nest_mcs01/PM_MCS01_64B_R... >> >> So is the PMU name correct in the metric file for nest_mcs01_imc? Looking at >> the kernel driver file, arch/powerpc/perf/imc-pmu.c, it seems to be correct. >> Not sure. > > I ran with a newer kernel, and the above errors disappeared, replaced with > about 10 of: > -- > Error string 'Cannot find PMU `hv_24x7'. Missing kernel support?' help '(null)' > -- > > ...but I was running without a hypervisor, so I tried the same kernel on a > PowerVM-virtualized system and the "hv_24x7" messages went away, but the > "nest" messages returned. This may all be expected behavior... I confess > I haven't followed these new perf capabilities closely. >
Hi Paul/John, This is something expected. For nest-imc we need bare-metal system and for hv-24x7 we need VM environment. Since you are checking this test in VM machine, there nest events are not supported and hence we are getting this error.
Thanks, Kajol Jain
> It's extremely likely that none of these errors has anything to do with your > changes. :- > > PC >
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