[PATCH bpf-next 0/3] Add bpf_access_process_vm helper and sleepable bpf iterator programs

[Kenny Yu <kennyyu@fb.com>]

This patch series makes the following changes:
* Adds a new bpf helper `bpf_access_process_vm` to read user space
  memory from a different task.
* Adds the ability to create sleepable bpf iterator programs.

As an example of how this will be used, at Meta we are using bpf task iterator
programs and this new bpf helper to read C++ async stack traces of a running
process for debugging C++ binaries in production.

Kenny Yu (3):
  bpf: Add bpf_access_process_vm() helper
  libbpf: Add "iter.s" section for sleepable bpf iterator programs
  selftests/bpf: Add test for sleepable bpf iterator programs

 include/linux/bpf.h                           |  1 +
 include/uapi/linux/bpf.h                      | 10 +++++
 kernel/bpf/helpers.c                          | 19 ++++++++
 kernel/trace/bpf_trace.c                      |  2 +
 tools/include/uapi/linux/bpf.h                | 10 +++++
 tools/lib/bpf/libbpf.c                        |  1 +
 .../selftests/bpf/prog_tests/bpf_iter.c       | 16 +++++++
 .../selftests/bpf/progs/bpf_iter_task.c       | 43 +++++++++++++++++++
 8 files changed, 102 insertions(+)

-- 
2.30.2