linux-stable.git/tools/testing/selftests/bpf/prog_tests/tracing_multi.c, branch master

selftests/bpf: Add tracing multi attach rollback tests

2026-06-07T18:03:05+00:00

Adding tests for the rollback code when the tracing_multi
link won't get attached, covering 2 reasons:

  - wrong btf id passed by user, where all previously allocated
    trampolines will be released
  - trampoline for requested function is fully attached (has already
    maximum programs attached) and the link fails, the rollback code
    needs to release all previously link-ed trampolines and release
    them

We need the bpf_fentry_test* unattached for the tests to pass,
so the rollback tests are serial.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-30-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi attach benchmark test

2026-06-07T18:02:04+00:00

Adding benchmark test that attaches to (almost) all allowed tracing
functions and display attach/detach times.

  # ./test_progs -t tracing_multi_bench_attach -v
  bpf_testmod.ko is already unloaded.
  Loading bpf_testmod.ko...
  Successfully loaded bpf_testmod.ko.
  serial_test_tracing_multi_bench_attach:PASS:btf__load_vmlinux_btf 0 nsec
  serial_test_tracing_multi_bench_attach:PASS:tracing_multi_bench__open_and_load 0 nsec
  serial_test_tracing_multi_bench_attach:PASS:get_syms 0 nsec
  serial_test_tracing_multi_bench_attach:PASS:bpf_program__attach_tracing_multi 0 nsec
  serial_test_tracing_multi_bench_attach: found 51186 functions
  serial_test_tracing_multi_bench_attach: attached in   1.295s
  serial_test_tracing_multi_bench_attach: detached in   0.243s
  #507     tracing_multi_bench_attach:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
  Successfully unloaded bpf_testmod.ko.

Exporting skip_entry as is_unsafe_function and using it in the test.

Also updating trace_blacklist with ___migrate_enable to be in sync
with kernel functions deny list.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-29-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi verifier fails test

2026-06-07T17:03:03+00:00

Adding tests for verifier fails on tracing multi programs.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-28-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi attach fails test

2026-06-07T17:03:03+00:00

Adding tests for attach fails on tracing multi link.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-27-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi session test

2026-06-07T17:03:03+00:00

Adding tests for tracing multi link session.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-26-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi cookies test

2026-06-07T17:03:02+00:00

Adding tests for using cookies on tracing multi link.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-25-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi intersect tests

2026-06-07T17:03:02+00:00

Adding tracing multi tests for intersecting attached functions.

Using bits from (from 1 to 16 values) to specify (up to 4) attached
programs, and randomly choosing bpf_fentry_test* functions they are
attached to.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-24-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi skel/pattern/ids module attach tests

2026-06-07T17:03:02+00:00

Adding tests for tracing_multi link attachment via all possible
libbpf apis - skeleton, function pattern and btf ids on top of
bpf_testmod kernel module.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-23-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tracing multi skel/pattern/ids attach tests

2026-06-07T17:03:02+00:00

Adding tests for tracing_multi link attachment via all possible
libbpf apis - skeleton, function pattern and btf ids.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-22-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov