[RFC PATCH perf/core v3 00/17] perf-probe --cache and SDT support

From: Masami Hiramatsu
Date: Sat Aug 15 2015 - 07:48:04 EST


Here is the 3rd version of the patchset for probe-cache and
initial SDT support which are going to be perf-cache finally.

The previous version is here; https://lkml.org/lkml/2015/7/15/221

This version improves SDT support for perf-list and perf-record.
It is still just a basic support (no wildcard support, nor
@FILE/@BUILDID support). So this is an ongoing work report :)

As we discussed on the previous series, now all SDT events have
"sdt_" prefix on the provider name. We also should support "@FILE"
or "@BUILDID" suffixes for same-name SDTs.

perf-list shows only SDTs on existing binaries (no old/deleted
files) and if the same-name events are shown, it adds
"@FILE@BUILDID" suffixes after the events to clarify on which
binary the SDT exists.

# perf buildid-cache -a /usr/bin/gcc
# perf list sdt

List of pre-defined events (to be used in -e):

sdt_libgcc:unwind [SDT event]
sdt_libstdcxx:catch [SDT event]
sdt_libstdcxx:rethrow [SDT event]
sdt_libstdcxx:throw [SDT event]
# perf buildid-cache -a /usr/lib/libstdc++.so.6
# perf list sdt

List of pre-defined events (to be used in -e):

sdt_libgcc:unwind [SDT event]
sdt_libstdcxx:catch@/usr/bin/gcc@0x05d261236bbb [SDT event]
sdt_libstdcxx:catch@/usr/lib/libstdc++.so.6.0.19@0xcd6ac0e6236c [SDT event]
sdt_libstdcxx:rethrow@/usr/bin/gcc@0x05d261236bbb [SDT event]
sdt_libstdcxx:rethrow@/usr/lib/libstdc++.so.6.0.19@0xcd6ac0e6236c [SDT event]
sdt_libstdcxx:throw@/usr/bin/gcc@0x05d261236bbb [SDT event]
sdt_libstdcxx:throw@/usr/lib/libstdc++.so.6.0.19@0xcd6ac0e6236c [SDT event]

In this version, I used "@" separater for both FILE and BUILDID,
but I think it is also possible to use "%" for BUILDID.
(BTW, I've cut down the BUILDID to the first 12 chars, and added "0x")

- (perf record) Allow glob matching for SDT event to specify events.
- (perf record) Support @FILE/@BUILDID suffix to record specific SDTs.
- (perf record) Try to unregister SDT events after record.
- (perf probe) Allow glob matching for pre-cached events.
- (perf probe) Support @FILE/@BUILDID suffix for pre-cached events.
(also removes -x option when using pre-cached events)
- (ftrace) Support multiple SDTs on single event.

Since multiple same SDTs are defined in a single binary (e.g. libc:setjump
has 3 different entries on libc-2.17.so), we need the last feature on
ftrace, so that a single uprobe event can occur several different
probe points.

Thank you,


Hemant Kumar (1):
perf/sdt: ELF support for SDT

Masami Hiramatsu (16):
perf probe: Use strbuf for making strings in probe-event.c
perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid
perf buildid: Introduce sysfs/filename__sprintf_build_id
perf: Add lsdir to read a directory
perf-buildid-cache: Use lsdir for looking up buildid caches
perf probe: Add --cache option to cache the probe definitions
perf probe: Use cache entry if possible
perf probe: Show all cached probes
perf probe: Remove caches when --cache is given
perf probe: Add group name support
perf-probe: Set default kprobe group name if it is not given
perf buildid-cache: Scan and import user SDT events to probe cache
perf probe: Accept %sdt and %cached event name
perf-list: Show SDT events
perf-list: Skip SDTs placed in invalid binaries
perf record: Support recording SDT events

tools/perf/Documentation/perf-probe.txt | 14 +
tools/perf/builtin-buildid-cache.c | 14 -
tools/perf/builtin-buildid-list.c | 24 +
tools/perf/builtin-list.c | 3
tools/perf/builtin-probe.c | 6
tools/perf/util/build-id.c | 255 +++++++++++---
tools/perf/util/build-id.h | 8
tools/perf/util/dso.h | 5
tools/perf/util/parse-events.c | 142 ++++++++
tools/perf/util/parse-events.h | 2
tools/perf/util/probe-event.c | 574 ++++++++++++++++++++-----------
tools/perf/util/probe-event.h | 10 -
tools/perf/util/probe-file.c | 467 +++++++++++++++++++++++++
tools/perf/util/probe-file.h | 28 ++
tools/perf/util/probe-finder.c | 14 -
tools/perf/util/symbol-elf.c | 252 ++++++++++++++
tools/perf/util/symbol.c | 2
tools/perf/util/symbol.h | 22 +
tools/perf/util/util.c | 34 ++
tools/perf/util/util.h | 4
20 files changed, 1580 insertions(+), 300 deletions(-)

Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@xxxxxxxxxxx
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