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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
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

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 <>

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


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