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author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2011-06-27 03:27:51 -0400 |
---|---|---|
committer | Steven Rostedt <rostedt@goodmis.org> | 2011-07-15 16:25:12 -0400 |
commit | 14a8fd7ceea6915c613746203d6e9a2bf273f16c (patch) | |
tree | 738803bc847efa3a17e9076922f06ceaca20d8f0 /tools/perf/Documentation | |
parent | 190b57fcb9c5fed5414935a174094f534fc510bc (diff) |
perf probe: Support adding probes on offline kernel modules
Support adding probes on offline kernel modules. This enables
perf-probe to trace kernel-module init functions via perf-probe.
If user gives the path of module with -m option, perf-probe
expects the module is offline.
This feature works with --add, --funcs, and --vars.
E.g)
# perf probe -m /lib/modules/`uname -r`/kernel/fs/btrfs/btrfs.ko \
-a "extent_io_init:5 extent_state_cache"
Add new events:
probe:extent_io_init (on extent_io_init:5 with extent_state_cache)
probe:extent_io_init_1 (on extent_io_init:5 with extent_state_cache)
You can now use it on all perf tools, such as:
perf record -e probe:extent_io_init_1 -aR sleep 1
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Link: http://lkml.kernel.org/r/20110627072751.6528.10230.stgit@fedora15
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/Documentation')
-rw-r--r-- | tools/perf/Documentation/perf-probe.txt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt index 02bafce4b341..2780d9ce48bf 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt | |||
@@ -34,9 +34,11 @@ OPTIONS | |||
34 | Specify vmlinux path which has debuginfo (Dwarf binary). | 34 | Specify vmlinux path which has debuginfo (Dwarf binary). |
35 | 35 | ||
36 | -m:: | 36 | -m:: |
37 | --module=MODNAME:: | 37 | --module=MODNAME|PATH:: |
38 | Specify module name in which perf-probe searches probe points | 38 | Specify module name in which perf-probe searches probe points |
39 | or lines. | 39 | or lines. If a path of module file is passed, perf-probe |
40 | treat it as an offline module (this means you can add a probe on | ||
41 | a module which has not been loaded yet). | ||
40 | 42 | ||
41 | -s:: | 43 | -s:: |
42 | --source=PATH:: | 44 | --source=PATH:: |