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    SubjectRe: [PATCH 0/5] perf tools: add meta-data header support in pipe mode
    From
    Arnaldo,

    Any comment on this series?

    On Wed, Apr 11, 2012 at 11:01 AM, Stephane Eranian <eranian@google.com> wrote:
    > 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
    >
    > Signed-off-by: Stephane Eranian <eranian@google.com>
    >
    > Stephane Eranian (5):
    >  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
    >
    >  tools/perf/builtin-annotate.c     |    5 +
    >  tools/perf/builtin-buildid-list.c |    6 +-
    >  tools/perf/builtin-inject.c       |    6 +
    >  tools/perf/builtin-record.c       |   11 +-
    >  tools/perf/builtin-report.c       |    7 +-
    >  tools/perf/util/build-id.c        |    2 +
    >  tools/perf/util/event.c           |   12 +
    >  tools/perf/util/event.h           |   18 ++
    >  tools/perf/util/header.c          |  538 ++++++++++++++++++++++++++-----------
    >  tools/perf/util/header.h          |   11 +-
    >  tools/perf/util/session.c         |   52 +++-
    >  tools/perf/util/tool.h            |    4 +-
    >  12 files changed, 494 insertions(+), 178 deletions(-)
    >
    > --
    > 1.7.4.1
    >
    --
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