[PATCH bpf-next 0/5] introduce BPF_PROG_TYPE_USER

[Song Liu <songliubraving@fb.com>]

This set introduces a new program type BPF_PROG_TYPE_USER, or "user
program". User program is triggered from user space via
sys_bpf(BPF_PROG_TEST_RUN). User program will replace some uprobe programs.
Compared against uprobe, user program has the following advantages:

1. User programs are faster. The new selftest added in 5/5, shows that a
   simple uprobe program takes 1400 nanoseconds, while user program only
   takes 300 nanoseconds.
2. User can specify on which cpu the user program would run.
3. User can pass arguments to the user program.

Song Liu (5):
  bpf: introduce BPF_PROG_TYPE_USER
  libbpf: support BPF_PROG_TYPE_USER programs
  selftests/bpf: add selftest for BPF_PROG_TYPE_USER
  selftests/bpf: move two functions to test_progs.c
  selftests/bpf: add benchmark for uprobe vs. user_prog

 include/linux/bpf_types.h                     |   2 +
 include/uapi/linux/bpf.h                      |  19 +++
 kernel/bpf/syscall.c                          |   3 +-
 kernel/trace/bpf_trace.c                      | 121 ++++++++++++++++++
 tools/include/uapi/linux/bpf.h                |  19 +++
 tools/lib/bpf/bpf.c                           |   1 +
 tools/lib/bpf/bpf.h                           |   3 +
 tools/lib/bpf/libbpf.c                        |   1 +
 tools/lib/bpf/libbpf_probes.c                 |   1 +
 .../selftests/bpf/prog_tests/attach_probe.c   |  21 ---
 .../selftests/bpf/prog_tests/test_overhead.c  |   8 --
 .../bpf/prog_tests/uprobe_vs_user_prog.c      | 101 +++++++++++++++
 .../selftests/bpf/prog_tests/user_prog.c      |  52 ++++++++
 .../selftests/bpf/progs/uprobe_vs_user_prog.c |  21 +++
 tools/testing/selftests/bpf/progs/user_prog.c |  56 ++++++++
 tools/testing/selftests/bpf/test_progs.c      |  30 +++++
 tools/testing/selftests/bpf/test_progs.h      |   2 +
 17 files changed, 431 insertions(+), 30 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/uprobe_vs_user_prog.c
 create mode 100644 tools/testing/selftests/bpf/prog_tests/user_prog.c
 create mode 100644 tools/testing/selftests/bpf/progs/uprobe_vs_user_prog.c
 create mode 100644 tools/testing/selftests/bpf/progs/user_prog.c

--
2.24.1