RE: [PATCH v2 0/6] perf arm64 metricgroup support
From: Paul A. Clarke <hidden>
Date: 2021-03-29 21:10:23
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On Fri, Mar 26, 2021 at 10:57:40AM +0000, John Garry wrote:
On 25/03/2021 20:39, Paul A. Clarke wrote:quoted
On Thu, Mar 25, 2021 at 06:33:12PM +0800, John Garry wrote:quoted
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/ (local)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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel