[PATCHv3 0/7] uprobe, bpf: Add session support

Jiri Olsa
2024-09-09T07:46:00Z

hi,
this patchset is adding support for session uprobe attachment and
using it through bpf link for bpf programs.

The session means that the uprobe consumer is executed on entry
and return of probed function with additional control:
- entry callback can control execution of the return callback
- entry and return callbacks can share data/cookie

On more details please see patch #1.

It's based on Peter's perf/core:
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core

v3 changes:
- rebased on top of Andrii's recent changes in Peter's perf/core [2]
- I kept the session cookie instead of introducing generic session
data, because it makes the change much more complicated, I think
it can be added as a followup if it's needed
- addressed several small review fixes [Andrii]
- added uprobe.session.s section and test [Andrii]
- kept acks from previous version on patches that did not change

thanks,
jirka

---
Jiri Olsa (7):
uprobe: Add support for session consumer
bpf: Add support for uprobe multi session attach
bpf: Add support for uprobe multi session context
libbpf: Add support for uprobe multi session attach
selftests/bpf: Add uprobe session test
selftests/bpf: Add uprobe session cookie test
selftests/bpf: Add uprobe session recursive test

include/linux/uprobes.h | 17 +++++++++--
include/uapi/linux/bpf.h | 1 +
kernel/bpf/syscall.c | 9 ++++--
kernel/events/uprobes.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------
kernel/trace/bpf_trace.c | 59 ++++++++++++++++++++++++++-----------
kernel/trace/trace_uprobe.c | 12 +++++---
tools/include/uapi/linux/bpf.h | 1 +
tools/lib/bpf/bpf.c | 1 +
tools/lib/bpf/libbpf.c | 51 ++++++++++++++++++++++++++++++--
tools/lib/bpf/libbpf.h | 4 ++-
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 2 +-
tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/uprobe_multi_session.c | 71 ++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c | 48 ++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c | 44 ++++++++++++++++++++++++++++
15 files changed, 531 insertions(+), 56 deletions(-)
create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session.c
create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c
create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c