perf probe: Add probed module in front of function
Add probed module name and ":" in front of function name
if -m module option is given. In the result, the symbol
name passed to kprobe-tracer becomes MODULE:FUNCTION,
so that kallsyms can solve it as a symbol in the module
correctly.
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/20110627072745.6528.26416.stgit@fedora15
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 920c195..ee3f41e 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -226,14 +226,26 @@
return 0;
}
+static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
+ int ntevs, const char *module)
+{
+ int i;
+ for (i = 0; i < ntevs; i++) {
+ tevs[i].point.module = strdup(module);
+ if (!tevs[i].point.module)
+ return -ENOMEM;
+ }
+ return 0;
+}
+
/* Try to find perf_probe_event with debuginfo */
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
- struct probe_trace_event **tevs,
- int max_tevs, const char *module)
+ struct probe_trace_event **tevs,
+ int max_tevs, const char *module)
{
bool need_dwarf = perf_probe_event_need_dwarf(pev);
struct debuginfo *dinfo = open_debuginfo(module);
- int ntevs;
+ int ntevs, ret = 0;
if (!dinfo) {
if (need_dwarf) {
@@ -251,7 +263,10 @@
if (ntevs > 0) { /* Succeeded to find trace events */
pr_debug("find %d probe_trace_events.\n", ntevs);
- return ntevs;
+ if (module)
+ ret = add_module_to_probe_trace_events(*tevs, ntevs,
+ module);
+ return ret < 0 ? ret : ntevs;
}
if (ntevs == 0) { /* No error but failed to find probe point. */
@@ -1010,7 +1025,7 @@
/* Parse probe_events event into struct probe_point */
static int parse_probe_trace_command(const char *cmd,
- struct probe_trace_event *tev)
+ struct probe_trace_event *tev)
{
struct probe_trace_point *tp = &tev->point;
char pr;
@@ -1043,8 +1058,14 @@
tp->retprobe = (pr == 'r');
- /* Scan function name and offset */
- ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
+ /* Scan module name(if there), function name and offset */
+ p = strchr(argv[1], ':');
+ if (p) {
+ tp->module = strndup(argv[1], p - argv[1]);
+ p++;
+ } else
+ p = argv[1];
+ ret = sscanf(p, "%a[^+]+%lu", (float *)(void *)&tp->symbol,
&tp->offset);
if (ret == 1)
tp->offset = 0;
@@ -1289,9 +1310,10 @@
if (buf == NULL)
return NULL;
- len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
+ len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s%s%s+%lu",
tp->retprobe ? 'r' : 'p',
tev->group, tev->event,
+ tp->module ?: "", tp->module ? ":" : "",
tp->symbol, tp->offset);
if (len <= 0)
goto error;
@@ -1398,6 +1420,8 @@
free(tev->group);
if (tev->point.symbol)
free(tev->point.symbol);
+ if (tev->point.module)
+ free(tev->point.module);
for (i = 0; i < tev->nargs; i++) {
if (tev->args[i].name)
free(tev->args[i].name);
@@ -1749,7 +1773,7 @@
/* Convert perf_probe_event with debuginfo */
ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module);
if (ret != 0)
- return ret;
+ return ret; /* Found in debuginfo or got an error */
/* Allocate trace event buffer */
tev = *tevs = zalloc(sizeof(struct probe_trace_event));
@@ -1762,6 +1786,11 @@
ret = -ENOMEM;
goto error;
}
+ tev->point.module = strdup(module);
+ if (tev->point.module == NULL) {
+ ret = -ENOMEM;
+ goto error;
+ }
tev->point.offset = pev->point.offset;
tev->point.retprobe = pev->point.retprobe;
tev->nargs = pev->nargs;