Red Hat Bugzilla – Bug 589959
perf callchain doesn't work on x86_64
Last modified: 2012-05-01 09:15:40 EDT
Created attachment 412318 [details]
1) Compile attached program like this:
gcc -fno-inline -fno-omit-frame-pointer -O0 test.c -o test
2) Run the program for a while and collect data in sysprof
3) Get a performance listing for the program looking something like this:
+-> bar (90.9%)
+-> foo (9%)
+-> main (0.1%)
Instead the profile should look kinda like this:
+-> main (100%)
+-> foo (90.9%)
+-> bar (82%)
+-> bar (9%)
I'm not sure who to blame for this, so I'm filing it against sysprof first.
I also tried compiling it for 32bit and running it with 32bit and 64bit sysprof, and that didn't help either.
I investigated this further and it seems perf is broken, too. In fact, it seems the SYS_perf_event_open syscall does not produce any useful data for callgraphs.
Oprofile seems to work, though I feel a bit incapable of parsing opreport output.
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