linux-kernel - [PATCH v2 0/5] perf tools: add meta-data header support in pipe mode

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Date:	Tue, 15 May 2012 13:28:10 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	peterz@...radead.org, mingo@...e.hu, acme@...hat.com,
	dsahern@...il.com
Subject: [PATCH v2 0/5] perf tools: add meta-data header support in pipe mode

This patch series adds meta-data support to perf record/report in pipe
mode:
	perf record -o - foo | perf inject -b | perf report -i -

We had meta-data (information about host configuration, perf tool version,...)
in regular (file) mode but it was lacking in pipe mode. This patch series fixes
this.

In pipe mode, there is no meta-data header structures at the beginning of the
streamed data given we cannot seek in a pipe. Instead, we need to create pseudo
record types for each of the possible features, e.g., hostname, cpuid, event_desc,
and so on. Those pseudo records are guaranteed to be before any actual sample
records, therefore perf report/annotate are guaranteed to get the information
they need before processing the first sample.

The series also fixes perf inject to actually inject build-ids and buildid-list
to work better with pipe mode, i.e., print the build-ids.

With this series:

 $ perf record -o - noploop 2 | perf inject -b | perf report -i -
      # ========
      # captured on: Fri Jan 20 18:13:55 2012
      # ========
      #
      # hostname : quad
      # os release : 3.2.0-rc7-tip
      # perf version : 3.2.0
      # arch : x86_64
      # nrcpus online : 4
      # nrcpus avail : 4
      # cpudesc : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
      # cpuid : GenuineIntel,6,15,11
      # total memory : 8092884 kB
      ...
      # HEADER_CPU_TOPOLOGY info available, use -I to display
      noploop for 2 seconds
      [ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 0.084 MB - (~3677 samples) ]
        99.80%  noploop  noploop            [.] noploop
         0.19%  noploop  [kernel.kallsyms]  [k] radix_tree_gang_lookup

V2 is just a rebase to 3.4.0-rc7.

Signed-off-by: Stephane Eranian <eranian@...gle.com>

Stephane Eranian (6):
  perf inject: fix broken perf inject -b
  perf tools: fix piped mode read code
  perf tools: rename HEADER_TRACE_INFO to HEADER_TRACING_DATA
  perf record: add meta-data support for pipe-mode
  perf: make perf buildid-list work better with pipe mode

-- 
1.7.4.1

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