RFC Add trace event support to eBPF

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