Hi, Here is the 3th version of the series to support inherit events for bperf. This version add pid or tgid selection based on filter type in new_task prog to avoid memory waste and potential count loss. bperf (perf-stat --bpf-counter) has not supported inherit events during fork() since it was first introduced. This patch series tries to add this support by: 1) adding two new bpf programs to monitor task lifecycle; 2) recording new tasks in the filter map dynamically; 3) reusing `accum_key` of parent task for new tasks. Thanks, Tengda Changelog: --------- v3: (Address comments from Namhyung, thanks) * Use pid or tgid based on filter type in new_task prog * Add comments to explain pid usage for TGID type in exit_task prog v2: https://lore.kernel.org/all/20240905115918.772234-1-wutengda@xxxxxxxxxxxxxxx/ * Remove the unused init_filter_entries in follower bpf, declare a global filter_entry_count in bpf_counter instead * Attach on_newtask and on_exittask progs only if the filter type is either PID or TGID v1: https://lore.kernel.org/all/20240904123103.732507-1-wutengda@xxxxxxxxxxxxxxx/ Tengda Wu (2): perf stat: Support inherit events during fork() for bperf perf test: Use sqrtloop workload to test bperf event tools/perf/tests/shell/stat_bpf_counters.sh | 2 +- tools/perf/util/bpf_counter.c | 32 +++++-- tools/perf/util/bpf_skel/bperf_follower.bpf.c | 87 +++++++++++++++++-- tools/perf/util/bpf_skel/bperf_u.h | 5 ++ 4 files changed, 112 insertions(+), 14 deletions(-) -- 2.34.1
