[RFC][PATCH 00/10] Add trace event support to eBPF

[Tom Zanussi]

Hi,

As promised in previous threads, this patchset shares some common
functionality with the hist triggers code and enables trace events to
be accessed from eBPF programs.

It needs to be applied on top of current tracing/for-next with the
hist triggers v13 patches applied:

  https://lkml.org/lkml/2015/12/10/640

Any input welcome, especially things that could be done better wrt
eBPF, since I'm not as familiar with that code...

Thanks,

Tom

The following changes since commit def7919edab980525728a6ee9728c23ececdaf52:

  tracing: Add hist trigger 'log2' modifier (2016-02-10 09:51:54 -0600)

are available in the git repository at:

  git://git.yoctoproject.org/linux-yocto-contrib.git tzanussi/ebpf-trace-events-v0
  http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-contrib/log/?h=tzanussi/ebpf-trace-events-v0

Tom Zanussi (10):
  tracing: Move some constants to ring_buffer.h
  eBPF: Add BPF_PROG_TYPE_TRACE_EVENT prog type
  tracing: Add an 'accessor' function to ftrace_event_field
  tracing: Add trace event accessor functions
  eBPF/tracing: Add eBPF trace event field access helpers
  tracing: Add kprobe/uprobe support for TRACE_EVENT eBPF progs
  tracing: Add eBPF program support to static trace events
  samples/bpf: Add support for trace events to the eBPF loading code
  samples/bpf: Add readcounts-by-pid example
  samples/bpf: Add kprobe-event-fields example

 include/linux/ring_buffer.h            |  35 ++++++++
 include/linux/trace_events.h           |   7 ++
 include/trace/perf.h                   |  10 +++
 include/uapi/linux/bpf.h               |  19 +++++
 kernel/bpf/verifier.c                  |   2 +-
 kernel/events/core.c                   |  12 +--
 kernel/trace/bpf_trace.c               | 149 +++++++++++++++++++++++++++++++++
 kernel/trace/ring_buffer.c             |  31 -------
 kernel/trace/trace.h                   |   5 ++
 kernel/trace/trace_events.c            | 111 ++++++++++++++++++++++++
 kernel/trace/trace_events_hist.c       | 103 +++--------------------
 kernel/trace/trace_kprobe.c            |  20 ++++-
 kernel/trace/trace_syscalls.c          |  18 ++++
 kernel/trace/trace_uprobe.c            |  11 ++-
 samples/bpf/Makefile                   |   8 ++
 samples/bpf/bpf_helpers.h              |   4 +
 samples/bpf/bpf_load.c                 |  46 ++++++++--
 samples/bpf/kprobe-event-fields_kern.c |  56 +++++++++++++
 samples/bpf/kprobe-event-fields_user.c |  25 ++++++
 samples/bpf/readcounts-by-pid_kern.c   |  57 +++++++++++++
 samples/bpf/readcounts-by-pid_user.c   |  66 +++++++++++++++
 21 files changed, 657 insertions(+), 138 deletions(-)
 create mode 100644 samples/bpf/kprobe-event-fields_kern.c
 create mode 100644 samples/bpf/kprobe-event-fields_user.c
 create mode 100644 samples/bpf/readcounts-by-pid_kern.c
 create mode 100644 samples/bpf/readcounts-by-pid_user.c

-- 
1.9.3