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 <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
---
tools/perf/util/bpf_skel/off_cpu.bpf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/bpf_skel/off_cpu.bpf.c b/tools/perf/util/bpf_skel/off_cpu.bpf.c
index 38e3b287dbb2..d877a0a9731f 100644
--- a/tools/perf/util/bpf_skel/off_cpu.bpf.c
+++ b/tools/perf/util/bpf_skel/off_cpu.bpf.c
@@ -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";
--
2.39.2.637.g21b0678d19-goog