Retry to find the given address from offline dwarfs too.
On the KASLR enabled kernel, the kernel text section is
loaded with random offset, and debuginfo__new_online_kernel
tries to map the debuginfo with that offset. However,
perf's map object tries to make a non-randomized ummapped
address. This leads to fail looking up the appropriate
debuginfo from that address.
To solve this issue, we retry to use offline dwarfs if
possible.
Without this change;
# ./perf probe -l
probe:t_show (on _stext+901288 with m v)
probe:t_show_1 (on _stext+939624 with m v t)
probe:t_show_2 (on _stext+980296 with m v fmt)
probe:t_show_3 (on _stext+1014392 with m v file)
With this change;
# ./perf probe -l
probe:t_show (on t_show@linux-3/kernel/trace/ftrace.c with m v)
probe:t_show_1 (on t_show@linux-3/kernel/trace/trace.c with m v t)
probe:t_show_2 (on t_show@kernel/trace/trace_printk.c with m v fmt)
probe:t_show_3 (on t_show@kernel/trace/trace_events.c with m v file)
Signed-off-by: Masami Hiramatsu <masami.hiramatsu...@hitachi.com>
---
tools/perf/util/probe-event.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 120954b..b35f047 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -272,6 +272,8 @@ static int kprobe_convert_to_perf_probe(struct
probe_trace_point *tp,
tp->offset, addr);
dinfo = debuginfo__new_online_kernel(addr);
+ if (!dinfo) /* For kaslr kernel */
+ dinfo = open_debuginfo(tp->module);
if (dinfo) {
ret = debuginfo__find_probe_point(dinfo,
(unsigned long)addr, pp);
--
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