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

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Message-ID: <20170613185422.GA6092@krava>
Date:   Tue, 13 Jun 2017 20:54:22 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     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 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


thanks,
jirka