perf stat: Add/fix bperf cgroup max events workarounds

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Commit b8308511f6 bumped the max events to 1024 but this results in
BPF verifier issues if the number of command line events is too
large. Workaround this by:

1) moving the constants to a header file to share between BPF and perf
   C code,
2) testing that the maximum number of events doesn't cause BPF
   verifier issues in debug builds,
3) lower the max events from 1024 to 128,
4) in perf stat, if there are more events than the BPF counters can
   support then disable BPF counter usage.

The rodata setup is factored into its own function to avoid
duplicating it in the testing code.

Signed-off-by: Ian Rogers <irogers@google.com>
Fixes: b8308511f6 ("perf stat bperf cgroup: Increase MAX_EVENTS from 32 to 1024")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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This commit is contained in:

Ian Rogers 2025-10-25 13:28:34 -07:00 • committed by Namhyung Kim

parent 3e98f0203e

commit be806f06ad

4 changed files with 91 additions and 34 deletions

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13

tools/perf/builtin-stat.c

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79

tools/perf/util/bpf_counter_cgroup.c

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18

tools/perf/util/bpf_skel/bperf_cgroup.bpf.c

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15

tools/perf/util/bpf_skel/bperf_cgroup.h

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