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Arm PMUs have a suffix, either a single decimal (armv8_pmuv3_0) or 3 hex digits which (armv8_cortex_a53) which Perf assumes are both strippable suffixes for the purposes of deduplication. S390 "cpum_cf" is a similarly suffixed core PMU but is only two characters so is not treated as strippable because the rules are a minimum of 3 hex characters or 1 decimal character. There are two paths involved in listing PMU events: * HW/cache event printing assumes core PMUs don't have suffixes so doesn't try to strip. * Sysfs PMU events share the printing function with uncore PMUs which strips. This results in slightly inconsistent Perf list behavior if a core PMU has a suffix: # perf list ... armv8_pmuv3_0/branch-load-misses/ armv8_pmuv3/l3d_cache_wb/ [Kernel PMU event] ... Fix it by partially reverting back to the old list behavior where stripping was only done for uncore PMUs. For example commit |
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