Bug 207777
| Summary: | Userspace frames are missing despite -fno-omit-frame-pointer | ||
|---|---|---|---|
| Product: | Tracing/Profiling | Reporter: | Konstantin Kharlamov (hi-angel) |
| Component: | Perf tool | Assignee: | Arnaldo Carvalho de Melo (acme) |
| Status: | NEW --- | ||
| Severity: | normal | CC: | jolsa |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| See Also: | https://bugzilla.kernel.org/show_bug.cgi?id=207301 | ||
| Kernel Version: | 5.6.13 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
Omg, sorry, forgot to put the code in the description
#include <unistd.h>
void f() {
for (size_t i = 0; i < 5; ++i) {
sleep(1);
}
}
void g() {
f();
}
int main() {
g();
}
I just remember that there's an alternative way to get stack traces: by using `--callgraph=X`. When that X is dwarf, I get the correct output. |
# Steps to reproduce (in terms of terminal commands) $ gcc test.c -o test -O0 -g3 -fno-omit-frame-pointer $ sudo sysctl kernel.sched_schedstats=1 kernel.sched_schedstats = 1 $ sudo perf record -e sched:sched_stat_sleep,sched:sched_switch,sched:sched_process_exit -g ./test [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.033 MB perf.data (34 samples) ] $ sudo perf script | grep -E "main|\bg\b|\bf\b" ## Expected Last command should've printed lines that accord to frames inside `main`, `g`, `f` functions ## Actual No output from the last command