diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2025-02-27 11:12:23 -0800 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-03-13 00:18:10 -0700 |
| commit | e1cde2d5e92f6728a022754650b9cb1e38358d50 (patch) | |
| tree | 82d20a9ab544e34252064dd621af199fc2badc82 /tools | |
| parent | 79056b3fe8878fa77ea8e9cbe062e428d2845982 (diff) | |
perf ftrace: Use atomic inc to update histogram in BPF
It should use an atomic instruction to update even if the histogram is
keyed by delta as it's also used for stats.
Cc: Gabriele Monaco <gmonaco@redhat.com>
Link: https://lore.kernel.org/r/20250227191223.1288473-3-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/bpf_skel/func_latency.bpf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/bpf_skel/func_latency.bpf.c b/tools/perf/util/bpf_skel/func_latency.bpf.c index ad7054744678..e731a79a753a 100644 --- a/tools/perf/util/bpf_skel/func_latency.bpf.c +++ b/tools/perf/util/bpf_skel/func_latency.bpf.c @@ -142,7 +142,7 @@ do_lookup: if (!hist) return 0; - *hist += 1; + __sync_fetch_and_add(hist, 1); __sync_fetch_and_add(&total, delta); // always in nsec __sync_fetch_and_add(&count, 1); |