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Date: Tue, 13 Jun 2017 20:54:22 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: David Carrillo-Cisneros <davidcc@google.com>
Cc: linux-kernel@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>, Simon Que <sque@chromium.org>,
        Wang Nan <wangnan0@huawei.com>, Jiri Olsa <jolsa@kernel.org>,
        He Kuang <hekuang@huawei.com>, Masami Hiramatsu <mhiramat@kernel.org>,
        Stephane Eranian <eranian@google.com>, Paul Turner <pjt@google.com>
Subject: Re: [PATCH v4 00/16] perf tool: add meta-data header support for
 pipe-mode
Message-ID: <20170613185422.GA6092@krava>
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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@krava 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