linux-kernel - [BUG] perf: record does not seem to store buildids anymore

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Message-ID: <AANLkTimmScKO8YnPJWfTqFXBXQYwbbdej-gaYnHCgeTc@mail.gmail.com>
Date:	Tue, 18 May 2010 11:36:52 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	tzanussi@...il.com
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	acme@...radead.org, perfmon2-devel@...ts.sf.net, eranian@...il.com,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: [BUG] perf: record does not seem to store buildids anymore

Hi,

I am trying to understand how perf record deals with buildids.
I am interested in offline and not live processing. According
to http://lkml.org/lkml/2010/5/1/5, the inject patch does not
change perf record. It should still save the buildids at the
end of the perf.data file. I suspect it does not anymore.

If I do:

$ perf record -o - noploop 2 | perf inject -b | perf report -v -i -
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.063 MB - (~2756 samples) ]
build id event received for
/lib/modules/2.6.34-tip-default+/build/vmlinux:
0ad6b5dd1295e0177be9d12acafa72daac664ee7
Looking at the vmlinux_path (5 entries long)
Using /lib/modules/2.6.34-tip-default+/build/vmlinux for symbols
build id event received for /usr/local/bin/noploop:
e8a36c0c1e36e18522233ff2a4b1fff0f9689b1c

There is indeed a buildid generated for my noploop test program.

But I do the simpler:

$ perf record -o perf.out noploop 2
noploop for 2 seconds
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.063 MB perf.out (~2739 samples) ]

$ perf buildid-list -i perf.out
$

I get nothing.

If I try with perf report -D:

$ perf report -D -i perf.out
   .....
     TOTAL events:       2011
      MMAP events:         21
      LOST events:          0
      COMM events:          1
      EXIT events:          1
  THROTTLE events:          0
UNTHROTTLE events:          0
      FORK events:          0
      READ events:          0
    SAMPLE events:       1988
      ATTR events:          0
EVENT_TYPE events:          0
TRACING_DATA events:          0
  BUILD_ID events:          0

It shows no buildid events found.

So either something is broken or I don't understand the logic here.
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