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| H A D | bpf_counter_cgroup.c | 3da35231 Fri Sep 16 13:41:30 CDT 2022 Namhyung Kim <namhyung@kernel.org> perf stat: Fix cpu map index in bperf cgroup code
The previous cpu map introduced a bug in the bperf cgroup counter. This
results in a failure when user gives a partial cpu map starting from
non-zero.
$ sudo ./perf stat -C 1-2 --bpf-counters --for-each-cgroup ^. sleep 1
libbpf: prog 'on_cgrp_switch': failed to create BPF link for perf_event FD 0:
-9 (Bad file descriptor)
Failed to attach cgroup program
To get the FD of an evsel, it should use a map index not the CPU number.
Fixes: 0255571a16059c8e ("perf cpumap: Switch to using perf_cpu_map API")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: bpf@vger.kernel.org
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/r/20220916184132.1161506-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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