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| author |   Namhyung Kim <namhyung@kernel.org> | 2023-10-20 13:47:40 -0700 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2023-10-25 10:02:47 -0700 |
| commit | 6a070573f290f99a6129ac3e13b9df521a1a65de (patch) | |
| tree | 61889f17e90cc264f7645ecbdf1a5065622a68eb /tools/perf/scripts/python | |
| parent | perf lock contention: Clear lock addr after use (diff) | |
| download | wireguard-linux-6a070573f290f99a6129ac3e13b9df521a1a65de.tar.xz wireguard-linux-6a070573f290f99a6129ac3e13b9df521a1a65de.zip | |
perf lock contention: Check race in tstamp elem creation
When pelem is NULL, it'd create a new entry with zero data. But it
might be preempted by IRQ/NMI just before calling bpf_map_update_elem()
then there's a chance to call it twice for the same pid. So it'd be
better to use BPF_NOEXIST flag and check the return value to prevent
the race.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Song Liu <song@kernel.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20231020204741.1869520-2-namhyung@kernel.org
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions