Re: Wrong Perf Backtraces

ahmadkhorrami <ahmadkhorrami@xxxxxxxx> · Sun, 29 Mar 2020 05:13:18 +0430

Hi Mr. Olsa,

Thanks for your time. The problem is still there. Repeated lines are not 

limited to inline functions. If my script works on your system, it will 

show these lines.

Regards.

On 2020-03-29 04:04, Jiri Olsa wrote:


On Sat, Mar 28, 2020 at 03:42:53AM +0430, ahmadkhorrami wrote:


Hi,

Thanks. If you suggest the potentially bogus locations of the source 

code, I

will give a try.
Regards.


heya,
the change below 'fixes' it for me:

$ perf script ...
...
evince 2220122 1605573.007639:      11759 cycles:u:
ffffffffaec012f0 [unknown] ([unknown])
7f93f17116b6 __mmap64+0x26 mmap64.c:59 (inlined)
7f93f17116b6 __mmap64+0x26 mmap64.c:47 (inlined)

it wasn't really broken, the output is just missing the source line
info in perf script callchain output, which adds the "missing part",
because for inlined entries the entry address stays the same for all
its inlined parts

could you try the change?

thanks,
jirka

diff --git a/tools/perf/util/evsel_fprintf.c 

b/tools/perf/util/evsel_fprintf.c

index 3b4842840db0..7349dfbbef2e 100644
--- a/tools/perf/util/evsel_fprintf.c
+++ b/tools/perf/util/evsel_fprintf.c

@@ -174,8 +174,11 @@ int sample__fprintf_callchain(struct perf_sample 

*sample, int left_alignment,

if (print_srcline)
printed += map__fprintf_srcline(map, addr, "\n  ", fp);

-            if (sym && sym->inlined)
+            if (sym && sym->inlined) {
+                if (node->srcline)
+                    printed += fprintf(fp, " %s", node->srcline);
printed += fprintf(fp, " (inlined)");
+            }

if (!print_oneline)
printed += fprintf(fp, "\n");



