diff options
| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2011-06-27 16:27:51 +0900 |
|---|---|---|
| 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 02bafce4b34..2780d9ce48b 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt @@ -34,9 +34,11 @@ OPTIONS Specify vmlinux path which has debuginfo (Dwarf binary). -m:: ---module=MODNAME:: +--module=MODNAME|PATH:: Specify module name in which perf-probe searches probe points - or lines. + or lines. If a path of module file is passed, perf-probe + treat it as an offline module (this means you can add a probe on + a module which has not been loaded yet). -s:: --source=PATH:: |