Bug 589959 - perf callchain doesn't work on x86_64
perf callchain doesn't work on x86_64
Status: CLOSED WORKSFORME
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
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All Linux
low Severity medium
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
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Reported: 2010-05-07 07:58 EDT by Benjamin Otte
Modified: 2012-05-01 09:15 EDT (History)
8 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-05-01 09:15:40 EDT
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Attachments (Terms of Use)
test program (240 bytes, text/plain)
2010-05-07 07:58 EDT, Benjamin Otte
no flags Details

  None (edit)
Description Benjamin Otte 2010-05-07 07:58:42 EDT
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 08:18:21 EDT
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 10:22:45 EDT
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