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