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Subject[RFC][PATCH 0/2] perf/live buildid
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The first patch in this patchset removes the current live-mode build
id support, which probably makes sense to apply independent of the
second.

The second is an RFC patch whose immediate purpose is to replace the
current build-id support in 'live mode' with something that makes more
sense for live mode - injecting the build ids before the samples that
use them.

To do that, a new perf command, perf-inject, is introduced.

perf-inject basically pipes the stdout received from live-mode
perf-record to the stdin of live-mode perf-report, but in-between
provides a means for the event stream to be interpreted and augmented
with 'injected events'.

In this case, the injected events are the same build-ids recorded in
the current version, but provided in a more timely fashion.

perf-inject is meant to be a live-mode-only utility and normally
provides no output other than the stdout piping that is its purpose;
the output below uses the -v options on both perf-inject and
perf-report to show what it's basically doing.

I haven't had time to try it out yet, but the idea would be that if
you had the relevant build-ids on a remote system, say via
perf-archive, you'd be able to run a live-mode perf session on one
system and have the output displayed live on the remote system.

Currently perf-inject is used only to provide build-ids, but it should
be easy to add support for other injected events e.g. it could be used
to look up and create uid->user name events, or syscall id->syscall
name events.

root@tropicana:~/perf-scripts# perf record -o - ./hackbench 10 | perf inject -v -b | perf report -v -i -
Running with 10*40 (== 400) tasks.
Time: 0.696
Looking at the vmlinux_path (5 entries long)
Using /lib/modules/2.6.34-rc5/build/vmlinux for symbols
build id found for /lib/modules/2.6.34-rc5/build/vmlinux: a925642e28500d4aeaffc62b2fc9071641ba303c
build id event received for /lib/modules/2.6.34-rc5/build/vmlinux: a925642e28500d4aeaffc62b2fc9071641ba303c
Looking at the vmlinux_path (5 entries long)
no build_id found for /lib/libc-2.8.90.so
build id found for ./hackbench: 1f1a90c20ffd00527b6002483df73a96540f041e
no build_id found for /lib/libpthread-2.8.90.so
Using /lib/modules/2.6.34-rc5/build/vmlinux for symbols
build id event received for ./hackbench: 1f1a90c20ffd00527b6002483df73a96540f041e
build id found for /lib/modules/2.6.34-rc5/kernel/drivers/net/forcedeth.ko: fdeed20f17ce5ba3c12d9a0f5d9add57db7e8d3f
build id event received for /lib/modules/2.6.34-rc5/kernel/drivers/net/forcedeth.ko: fdeed20f17ce5ba3c12d9a0f5d9add57db7e8d3f
no build_id found for /lib/ld-2.8.90.so
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.121 MB - (~5299 samples) ]
# Samples: 2019104685
#
# Overhead Command Shared Object Symbol
# ........ ......... ....................................................... ......
#
8.22% hackbench /lib/modules/2.6.34-rc5/build/vmlinux 0xffffffff811fbb5d ! [k] copy_user_generic_string
7.12% hackbench /lib/modules/2.6.34-rc5/build/vmlinux 0xffffffff8111ef55 ! [k] kfree
Tom Zanussi (2):
perf/live: don't synthesize build ids at the end of a live mode trace
perf: add perf-inject builtin

tools/perf/Makefile | 1 +
tools/perf/builtin-annotate.c | 2 +-
tools/perf/builtin-buildid-list.c | 2 +-
tools/perf/builtin-diff.c | 4 +-
tools/perf/builtin-inject.c | 228 ++++++++++++++++++++++++++++++++++++
tools/perf/builtin-kmem.c | 2 +-
tools/perf/builtin-lock.c | 2 +-
tools/perf/builtin-record.c | 9 +--
tools/perf/builtin-report.c | 2 +-
tools/perf/builtin-sched.c | 2 +-
tools/perf/builtin-timechart.c | 2 +-
tools/perf/builtin-top.c | 2 +-
tools/perf/builtin-trace.c | 2 +-
tools/perf/builtin.h | 1 +
tools/perf/perf.c | 1 +
tools/perf/util/header.c | 96 +++++-----------
tools/perf/util/header.h | 2 -
tools/perf/util/session.c | 3 +-
tools/perf/util/session.h | 3 +-
tools/perf/util/trace-event-read.c | 19 +++-
tools/perf/util/trace-event.h | 2 +-
21 files changed, 293 insertions(+), 94 deletions(-)
create mode 100644 tools/perf/builtin-inject.c


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