Hi,
Testing event group in sampling mode and finding
issues on the reporting side:
$ perf record --group -e 'grp1{cycles,instructions}' noploop 1
$ perf report --group --stdio
...
# group: M^B{cycles,instructions}
^^^^ broken group name
# ========
#
# Samples: 8K of event '[binfmt_misc] { cycles, instructions }'
^^^^^^^^^^^^^^ broken event group name
# Event count (approx.): 7024115127
#
# Overhead Command Shared Object Symbol
# ................ ....... ................. ...........................
#
99.96% 99.97% noploop noploop [.] main
0.03% 0.03% noploop [kernel.kallsyms] [k] apic_timer_interrupt
0.01% 0.01% noploop [kernel.kallsyms] [k] find_get_page
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