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Message-ID: <20131220100255.7169.19384.stgit@kbuild-fedora.novalocal>
Date: Fri, 20 Dec 2013 10:02:55 +0000
From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To: Ingo Molnar <mingo@...nel.org>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
David Ahern <dsahern@...il.com>,
lkml <linux-kernel@...r.kernel.org>,
"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
Oleg Nesterov <oleg@...hat.com>,
"David A. Long" <dave.long@...aro.org>, systemtap@...rceware.org,
yrl.pp-manager.tt@...achi.com, Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH -tip 0/3] perf-probe: Dwarf support for uprobes
Hi,
Here is the series of perf-probe patches which adds
dwarf(debuginfo) support for uprobes.
Currently perf-probe doesn't support debuginfo for uprobes.
The lack of the debuginfo support for uprobes sometimes
confuses users (or makes them cry) because they can't use
perf-probe as for kprobes case, and that is not what I hope.
So I tried to add debuginfo support for uprobes on
perf-probe. Actually, this is not completely done yet.
We still need to add some features for make it perfect.
However, this series can provide minimum debuginfo
support for uprobes.
For example)
- Shows the probe-able lines of the given function
----
# ./perf probe -x perf --line map__load
<map__load@...me/fedora/ksrc/linux-2.6/tools/perf/util/map.c:0>
0 int map__load(struct map *map, symbol_filter_t filter)
1 {
2 const char *name = map->dso->long_name;
int nr;
5 if (dso__loaded(map->dso, map->type))
6 return 0;
8 nr = dso__load(map->dso, map, filter);
9 if (nr < 0) {
10 if (map->dso->has_build_id) {
----
- Shows the available variables of the given line
----
# ./perf probe -x perf --vars map__load:8
Available variables at map__load:8
@<map__load+96>
char* name
struct map* map
symbol_filter_t filter
@<map__find_symbol+112>
char* name
symbol_filter_t filter
@<map__find_symbol_by_name+136>
char* name
symbol_filter_t filter
@<map_groups__find_symbol_by_name+176>
char* name
struct map* map
symbol_filter_t filter
----
- Set a probe with available vars on the given line
----
# ./perf probe -x perf --add 'map__load:8 $vars'
Added new events:
probe_perf:map__load (on map__load:8 with $vars)
probe_perf:map__load_1 (on map__load:8 with $vars)
probe_perf:map__load_2 (on map__load:8 with $vars)
probe_perf:map__load_3 (on map__load:8 with $vars)
You can now use it in all perf tools, such as:
perf record -e probe_perf:map__load_3 -aR sleep 1
----
To complete this requires Namhyung's uprobe
fetch-method updates which is almost done on LKML.
TODO:
- Convert data symbol name in arguments to address
offset value.
- Support distro style debuginfo path (/usr/lib/debug/...)
---
Masami Hiramatsu (3):
[CLEANUP] perf-probe: Expand given path to absolute path
perf-probe: Support dwarf on uprobe events
perf-probe: Use the actual address as a hint for uprobes
tools/perf/builtin-probe.c | 11 ++
tools/perf/util/probe-event.c | 247 +++++++++++++++++++++++++++-------------
tools/perf/util/probe-event.h | 1
tools/perf/util/probe-finder.c | 1
4 files changed, 176 insertions(+), 84 deletions(-)
--
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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