Messages in this thread | | | Date | Mon, 29 Mar 2021 16:07:17 -0500 | From | "Paul A. Clarke" <> | Subject | RE: [PATCH v2 0/6] perf arm64 metricgroup support |
| |
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.
It's extremely likely that none of these errors has anything to do with your changes. :-)
PC
| |