[-next,0/2] perf stat: a set of small fixes for bperf

Message

Tengda Wu Sept. 25, 2024, 1:55 p.m. UTC

Hi,

This is a set of small fixes for bperf (perf-stat --bpf-counters).

It aims to fix the following two issues:
  1) bperf limited the number of events to a maximum of 16, which
     caused failures in some scenarios and lacked friendly prompts. 
  2) bperf failed to correctly handle whether events were supported,
     resulting in the incorrect display when the event count was 0.

The reason for fixing these issues is that bperf is very useful in
some cost-sensitive scenarios, such as top-down analysis scenarios.
Increasing the attr map size can allow these scenarios to collect
more events at the same time, making it possible to gather enough
information to perform complex metric calculations in top-down.

Thanks,
Tengda

Tengda Wu (2):
  perf stat: Increase perf_attr_map entries
  perf stat: Fix incorrect display of bperf when event count is 0

 tools/lib/perf/include/perf/bpf_perf.h |  1 +
 tools/perf/util/bpf_counter.c          | 26 +++++++++++++++++---------
 2 files changed, 18 insertions(+), 9 deletions(-)