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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2011-06-27 16:27:51 +0900
committerSteven Rostedt <rostedt@goodmis.org>2011-07-15 16:25:12 -0400
commit14a8fd7ceea6915c613746203d6e9a2bf273f16c (patch)
tree738803bc847efa3a17e9076922f06ceaca20d8f0 /tools/perf/util
parent190b57fcb9c5fed5414935a174094f534fc510bc (diff)
downloadblackbird-op-linux-14a8fd7ceea6915c613746203d6e9a2bf273f16c.tar.gz
blackbird-op-linux-14a8fd7ceea6915c613746203d6e9a2bf273f16c.zip
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/util')
-rw-r--r--tools/perf/util/probe-event.c52
1 files changed, 43 insertions, 9 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index ee3f41eec5c1..b82d54fa2c56 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -117,6 +117,10 @@ static struct map *kernel_get_module_map(const char *module)
struct rb_node *nd;
struct map_groups *grp = &machine.kmaps;
+ /* A file path -- this is an offline module */
+ if (module && strchr(module, '/'))
+ return machine__new_module(&machine, 0, module);
+
if (!module)
module = "kernel";
@@ -173,12 +177,19 @@ const char *kernel_get_module_path(const char *module)
/* Open new debuginfo of given module */
static struct debuginfo *open_debuginfo(const char *module)
{
- const char *path = kernel_get_module_path(module);
+ const char *path;
- if (!path) {
- pr_err("Failed to find path of %s module.\n",
- module ?: "kernel");
- return NULL;
+ /* A file path -- this is an offline module */
+ if (module && strchr(module, '/'))
+ path = module;
+ else {
+ path = kernel_get_module_path(module);
+
+ if (!path) {
+ pr_err("Failed to find path of %s module.\n",
+ module ?: "kernel");
+ return NULL;
+ }
}
return debuginfo__new(path);
}
@@ -229,13 +240,36 @@ static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
int ntevs, const char *module)
{
- int i;
+ int i, ret = 0;
+ char *tmp;
+
+ if (!module)
+ return 0;
+
+ tmp = strrchr(module, '/');
+ if (tmp) {
+ /* This is a module path -- get the module name */
+ module = strdup(tmp + 1);
+ if (!module)
+ return -ENOMEM;
+ tmp = strchr(module, '.');
+ if (tmp)
+ *tmp = '\0';
+ tmp = (char *)module; /* For free() */
+ }
+
for (i = 0; i < ntevs; i++) {
tevs[i].point.module = strdup(module);
- if (!tevs[i].point.module)
- return -ENOMEM;
+ if (!tevs[i].point.module) {
+ ret = -ENOMEM;
+ break;
+ }
}
- return 0;
+
+ if (tmp)
+ free(tmp);
+
+ return ret;
}
/* Try to find perf_probe_event with debuginfo */
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