linux-kernel - Re: [PATCH 11/48] perf data: Support converting data from bpf_perf_event

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Date:	Tue, 23 Feb 2016 20:22:01 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Cody P Schafer <dev@...yps.com>,
	"David S. Miller" <davem@...emloft.net>,
	He Kuang <hekuang@...wei.com>,
	Jérémie Galarneau 
	<jeremie.galarneau@...icios.com>, Jiri Olsa <jolsa@...nel.org>,
	Kirill Smelkov <kirr@...edi.com>,
	Li Zefan <lizefan@...wei.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, pi3orama@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/48] perf data: Support converting data from
 bpf_perf_event_output()

On Mon, Feb 22, 2016 at 09:10:38AM +0000, Wang Nan wrote:

SNIP

>           usleep 14942 92503.298562: evt:  ffffffff810585e9 kretprobe_trampoline_holder (/lib....
> 
>  # ./perf data convert --to-ctf ./out.ctf
>  [ perf data convert: Converted 'perf.data' into CTF data './out.ctf' ]
>  [ perf data convert: Converted and wrote 0.000 MB (2 samples) ]
> 
>  # babeltrace ./out.ctf
>  [01:41:43.198504134] (+?.?????????) evt: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF810E0BA1, perf_tid = 14942, perf_pid = 14942, perf_id = 1044, raw_len = 3, raw_data = [ [0] = 0x32C0C07B, [1] = 0x5421, [2] = 0x1 ] }
>  [01:41:43.298562257] (+0.100058123) evt: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF810585E9, perf_tid = 14942, perf_pid = 14942, perf_id = 1044, raw_len = 3, raw_data = [ [0] = 0x38B77FAA, [1] = 0x5421, [2] = 0x2 ] }
> 
>  # cat ./test_bpf_output_2.py
>  from babeltrace import TraceCollection
>  tc = TraceCollection()
>  tc.add_trace('./out.ctf', 'ctf')
>  d = {1:[], 2:[]}
>  for event in tc.events:
>      if not event.name.startswith('evt'):
>          continue
>      raw_data = event['raw_data']
>      (time, type) = ((raw_data[0] + (raw_data[1] << 32)), raw_data[2])
>      d[type].append(time)
>  print(list(map(lambda i: d[2][i] - d[1][i], range(len(d[1])))));
> 
>  # python3 ./test_bpf_output_2.py
>  [100056879]
> 

Acked-by: Jiri Olsa <jolsa@...nel.org>

looks good to me.. also note I just compiled, haven't tried
the example above.. too far in bpf land for me ATM ;-)

thanks,
jirka