linux-kernel - Re: [PATCH 0/7] perf tool: add meta-data header support for pipe-mode

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Message-ID: <20170518051043.GA15563@tassilo.jf.intel.com>
Date:   Wed, 17 May 2017 22:10:43 -0700
From:   Andi Kleen <ak@...ux.intel.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>,
        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>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH 0/7] perf tool: add meta-data header support for pipe-mode

> The difficulty in pipe mode is that information needs to be written
> sequentially to the pipe. Meta data headers are usually generated
> (and also expected) at the beginning of the file (or piped output).
> To solve this problem, we introduce new synthetic record types,
> one for each meta-data type. The approach is similar to what
> is *ALREADY* used for BUILD_ID and TRACING_DATA.

The new headers need documentation in Documentation/perf.data-file-format.txt

-Andi