[PATCH 0/4] perf bpf: Add __bpf_stdout__ support

[Wang Nan <wangnan0@huawei.com>]

Hi Arnaldo,

   Following your suggestion, patch 3-4 in this patch set add __bpf_stdout__
support. If a map is called __bpf_stdout__, perf will create a bpf-output
event and attach to it automatically. Don't need to setup bpf output event
in cmdline explicitly.

 # perf record -e ./test_bpf_trace.c usleep 100000
 # ~/perf script
          usleep 25656 [003] 264724.900051:          0            __bpf_stdout__:  ffffffff810eb9a1 sys_nanosleep (/lib/modules
      BPF output: 0000: 52 61 69 73 65 20 61 20  Raise a 
                  0008: 42 50 46 20 65 76 65 6e  BPF even
                  0010: 74 21 00 00              t!..    
      BPF string: "Raise a BPF event!"

          usleep 25656 [003] 264725.000112:          0            __bpf_stdout__:  ffffffff8105d609 kretprobe_trampoline_holder
      BPF output: 0000: 52 61 69 73 65 20 61 20  Raise a 
                  0008: 42 50 46 20 65 76 65 6e  BPF even
                  0010: 74 21 00 00              t!..    
      BPF string: "Raise a BPF event!"

Wang Nan (4):
  perf trace: Improve error message when receive non-tracepoint events
  perf trace: Print content of bpf-output event
  perf bpf: Clone bpf stdout events in multiple bpf scripts
  perf bpf: Automatically create bpf-output event __bpf_stdout__

 tools/perf/builtin-record.c  |   8 +++
 tools/perf/builtin-trace.c   |  33 +++++++++-
 tools/perf/util/bpf-loader.c | 143 +++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/bpf-loader.h |  19 ++++++
 4 files changed, 202 insertions(+), 1 deletion(-)

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1.8.3.4