| Date | Wed, 17 May 2017 22:10:43 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH 0/7] perf tool: add meta-data header support for pipe-mode |
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> 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
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