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perf test: Fix offcpu test prev_state check

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On Fedora 36, the 'perf record' offcpu profiling tests are failing.  It

was because the BPF checks the prev task's state being S or D but
actually it has more bits set.  Let's check the LSB 8 bits for the
purpose of offcpu profiling.

Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230218162724.1292657-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2023-02-18 08:27:24 -08:00 committed by Arnaldo Carvalho de Melo
parent f9fa0778ee
commit 7c0631d494
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/bpf_skel/off_cpu.bpf.c
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@ -277,7 +277,7 @@ int on_switch(u64 *ctx)
else
prev_state = get_task_state(prev);
return off_cpu_stat(ctx, prev, next, prev_state);
return off_cpu_stat(ctx, prev, next, prev_state & 0xff);
}
char LICENSE[] SEC("license") = "Dual BSD/GPL";