[PATCH -next v2 0/2] perf stat: Support inherit events for bperf

[Tengda Wu <wutengda@huaweicloud.com>]

Hi,

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:
---------
v2: (Address comments from Namhyung)
 * 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@huaweicloud.com/


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 | 70 +++++++++++++++++--
 tools/perf/util/bpf_skel/bperf_u.h            |  5 ++
 4 files changed, 95 insertions(+), 14 deletions(-)

-- 
2.34.1