Bug 589959

Summary: perf callchain doesn't work on x86_64
Product: [Fedora] Fedora Reporter: Benjamin Otte <otte>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED WORKSFORME QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: rawhideCC: anton, fche, gansalmon, giallu, itamar, jonathan, kernel-maint, sandmann
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OS: Linux   
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Last Closed: 2012-05-01 13:15:40 UTC Type: ---
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test program none

Description Benjamin Otte 2010-05-07 11:58:42 UTC 
Created attachment 412318 [details]
test program

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:
> test
+-> bar (90.9%)
+-> foo (9%)
+-> main (0.1%)

Instead the profile should look kinda like this:
> test
+-> 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.
Comment 1 Benjamin Otte 2010-05-11 12:18:21 UTC 
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.
Comment 2 Bug Zapper 2011-06-02 14:22:45 UTC 
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