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| author | Andrii Nakryiko <andrii@kernel.org> | 2021-08-15 10:06:08 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2021-08-17 01:45:08 +0300 |
| commit | 5e3b8356de3623987ace530b1977ffeb9ecf5a8a (patch) | |
| tree | 290b81ae84bd5819db142c6da14c8502ae20c3b0 /tools/testing/selftests/bpf/trace_helpers.c | |
| parent | 0a80cf67f34cab7c18d74c28bb59e131670dc268 (diff) | |
| download | linux-5e3b8356de3623987ace530b1977ffeb9ecf5a8a.tar.xz | |
libbpf: Add uprobe ref counter offset support for USDT semaphores
When attaching to uprobes through perf subsystem, it's possible to specify
offset of a so-called USDT semaphore, which is just a reference counted u16,
used by kernel to keep track of how many tracers are attached to a given
location. Support for this feature was added in [0], so just wire this through
uprobe_opts. This is important to enable implementing USDT attachment and
tracing through libbpf's bpf_program__attach_uprobe_opts() API.
[0] a6ca88b241d5 ("trace_uprobe: support reference counter in fd-based uprobe")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210815070609.987780-16-andrii@kernel.org
Diffstat (limited to 'tools/testing/selftests/bpf/trace_helpers.c')
0 files changed, 0 insertions, 0 deletions