[RFC PATCH v2 0/4] Make eBPF programs output data to perf event

[He Kuang <hekuang@huawei.com>]

Hi,

Accordint to the discussion on patchset v1, it seems an extra
perf_trace_buf is reduntant, this patch removes the additional buffer
and stores bpf output into a temporary region at the ending of the
original perf_trace_buf. The temporary region will be moved back to
the proper offset of perf_trace_buf at the stage of
perf_trace_prepare_buf.

v1-v2:

  - Remove additional perf_trace_buf. Use the end of perf_trace_buf as
    a temporary region to store bpf data.
    
  - Rename bpf_output_sample to bpf_output_data.
  
  - New bpf API added to the end of the function list.

Thank you.

He Kuang (4):
  bpf: Put perf_events check ahead of bpf prog
  tracing/kprobe: Separate inc recursion count out of
    perf_trace_buf_prepare
  bpf: Introduce function for outputing data to perf event
  tracing/kprobe: Combine bpf output and perf event output

 include/linux/ftrace_event.h    |  4 +++
 include/linux/perf_event.h      |  2 ++
 include/uapi/linux/bpf.h        |  3 ++
 kernel/events/core.c            |  6 ++++
 kernel/events/internal.h        | 17 ++++++----
 kernel/trace/bpf_trace.c        | 29 +++++++++++++++++
 kernel/trace/trace_event_perf.c | 56 +++++++++++++++++++++++++++++---
 kernel/trace/trace_kprobe.c     | 72 ++++++++++++++++++++++++++++++++++-------
 samples/bpf/bpf_helpers.h       |  2 ++
 9 files changed, 167 insertions(+), 24 deletions(-)

-- 
1.8.5.2