When requesting a function from a userspace library the error message to
the user is less than helpful. e.g.,
perf probe -x /lib64/libpthread-2.14.90.so -a
'lock_full=__pthread_mutex_lock_full'
no symbols found in /lib64/libpthread-2.14.90.so, maybe install a debug
package?
Failed to load map.
Error: Failed to add events. (-22)
In this cae the symbol really does exist but is a local symbol which is
filtered:
nm /lib64/libpthread-2.14.90.so | grep __pthread_mutex_lock_full
0000000000005700 t __pthread_mutex_lock_full
With this patch:
perf probe -x /lib64/libpthread-2.14.90.so -a
'lock_full=__pthread_mutex_lock_full'
no symbols found in /lib64/libpthread-2.14.90.so, maybe install a debug
package?
Failed to find function in /lib64/libpthread-2.14.90.so. Perhaps it is a
local variable?
Error: Failed to add events. (-22)
Signed-off-by: David Ahern <dsah...@gmail.com>
Cc: Masami Hiramatsu <masami.hiramatsu...@hitachi.com>
Cc: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
---
tools/perf/util/probe-event.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 9c6989ca2bea..638071b7bdd2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2309,7 +2309,8 @@ static int convert_name_to_addr(struct perf_probe_event
*pev, const char *exec)
}
available_func_filter = strfilter__new(function, NULL);
if (map__load(map, filter_available_functions)) {
- pr_err("Failed to load map.\n");
+ pr_err("Failed to find requested function in %s. Perhaps it is
a local variable?\n",
+ name);
goto out;
}
--
1.8.3.4 (Apple Git-47)
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