• Jiri Olsa's avatar
    perf data: Add perf data to CTF conversion support · edbe9817
    Jiri Olsa authored
    Adding 'perf data convert' to convert perf data file into different
    format. This patch adds support for CTF format conversion.
    
    To convert perf.data into CTF run:
      $ perf data convert --to-ctf=./ctf-data/
      [ perf data convert: Converted 'perf.data' into CTF data './ctf-data/' ]
      [ perf data convert: Converted and wrote 11.268 MB (100230 samples) ]
    
    The command will create CTF metadata out of perf.data file (or one
    specified via -i option) and then convert all sample events into single
    CTF stream.
    
    Each sample_type bit is translated into separated CTF event field apart
    from following exceptions:
    
      PERF_SAMPLE_RAW          - added in next patch
      PERF_SAMPLE_READ         - TODO
      PERF_SAMPLE_CALLCHAIN    - TODO
      PERF_SAMPLE_BRANCH_STACK - TODO
      PERF_SAMPLE_REGS_USER    - TODO
      PERF_SAMPLE_STACK_USER   - TODO
    
      $ perf --debug=data-convert=2 data convert ...
    
    The converted CTF data could be analyzed by CTF tools, like babletrace
    or tracecompass [1].
    
      $ babeltrace ./ctf-data/
      [03:19:13.962125533] (+?.?????????) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 1 }
      [03:19:13.962130001] (+0.000004468) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 1 }
      [03:19:13.962131936] (+0.000001935) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 8 }
      [03:19:13.962133732] (+0.000001796) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 114 }
      [03:19:13.962135557] (+0.000001825) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 2087 }
      [03:19:13.962137627] (+0.000002070) cycles: { }, { ip = 0xFFFFFFFF81361938, tid = 20714, pid = 20714, period = 37582 }
      [03:19:13.962161091] (+0.000023464) cycles: { }, { ip = 0xFFFFFFFF8124218F, tid = 20714, pid = 20714, period = 600246 }
      [03:19:13.962517569] (+0.000356478) cycles: { }, { ip = 0xFFFFFFFF811A75DB, tid = 20714, pid = 20714, period = 1325731 }
      [03:19:13.969518008] (+0.007000439) cycles: { }, { ip = 0x34080917B2, tid = 20714, pid = 20714, period = 1144298 }
    
    The following members to the ctf-environment were decided to be added to
    distinguish and specify perf CTF data:
    
      - domain
    
        It says "kernel" because it contains a kernel trace (not to be
        confused with a user space like lttng-ust does)
    
      - tracer_name
    
        It says perf. This can be used to distinguish between lttng and perf
        CTF based trace.
    
      - version
    
        The kernel version from stream. In addition to release, this is what
        it looks like on a Debian kernel:
    
          release = "3.14-1-amd64";
          version = "3.14.0";
    
    [1] http://projects.eclipse.org/projects/tools.tracecompassSigned-off-by: default avatarJiri Olsa <jolsa@kernel.org>
    Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
    Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
    Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Jeremie Galarneau <jgalar@efficios.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    Cc: Tom Zanussi <tzanussi@gmail.com>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: http://lkml.kernel.org/r/1424470628-5969-4-git-send-email-jolsa@kernel.orgSigned-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    edbe9817
perf.txt 1.04 KB