linux-kernel - Re: [PATCH v4 00/16] perf tool: add meta-data header support for pipe-mode

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Message-ID: <CALcN6mh0tb+P4jYEQi8v20WeDa-MGY-WZwB=tz6HwP_KXVfyFg@mail.gmail.com>
Date:   Tue, 13 Jun 2017 23:44:20 -0700
From:   David Carrillo-Cisneros <davidcc@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v4 00/16] perf tool: add meta-data header support for pipe-mode

On Tue, Jun 13, 2017 at 11:54 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Mon, Jun 12, 2017 at 09:29:16PM -0700, David Carrillo-Cisneros wrote:
>> v4: - Limit write_* functions to page_size.
>>     - Fixed bugs spotted by Jiri.
>>     - Add information about pipe-mode to some error messages.
>
> hum, looks like we have pipe report broken.. on arnaldo's perf/core branch:
>
> [jolsa@...va perf]$ ./perf record ls | ./perf report
> # To display the perf.data header info, please use --header/--header-only options.
> #
>
> ...
>
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.000 MB (null) ]
> #
> # Total Lost Samples: 0
> #
> # Samples: 10  of event 'cycles:uhH'
> # Event count (approx.): 1810081
> #
> # Overhead  Trace output
> # ........  ............
> #
>    100.00%  N/A

I saw this bug before, that time I bisected it to commit d49dadea7862
("perf tools: Make 'trace' or 'trace_fields' sort key default for
tracepoint events") from Dec 2015 but didn't have time to look further
into it ...

David