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List:       oprofile-list
Subject:    Re: callgraph on x86_64
From:       Christopher Layne <clayne () anodized ! com>
Date:       2008-01-30 2:28:37
Message-ID: 20080130022837.GZ7265 () ns1 ! anodized ! com
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On Tue, Jan 29, 2008 at 05:53:03PM -0800, Konstantin Serebryany wrote:
> Hmm.
> I have a machine which works in mixed mode (2.6.18.5 mixed64-32).
> oprofile's flat profile works fine on it, but the callgraph does not.
> It shows me something like this:
> 
> $ opreport -l -c  ./bzip2
> ...-------------------------------------------------
> 98372    51.8719  BZ2_blockSort
> 98372    100.000  BZ2_blockSort [self]
> -------------------------------------------------------------------------------
> 71317    37.6057  fallbackSort
> 71317    100.000  fallbackSort [self]

For the record, I also see this behaviour. I can also remember seeing it atleast as \
far back as 4 months ago (from when I lasted tried using callgraph support). \
Unfortunately this isn't a multilib system so I can't try it under 32.

# opreport -gl -c '*bz2*'
CPU: AMD64 processors, speed 2400 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit mask of \
                0x00 (No unit mask) count 100000
warning: /var/lib/oprofile/samples/current/{root}/bin/bzip2/{dep}/{root}/lib64/libbz2.so.1.0.4/CPU_CLK_UNHALTED.100000.0.all.all.all \
is not in a usable binary format. samples  %        linenr info                 image \
                name               app name                 symbol name
-------------------------------------------------------------------------------
174693   54.0678  bzlib.c:808                 libbz2.so.1.0.4          bzip2          \
BZ2_bzDecompress  174693   100.000  bzlib.c:808                 libbz2.so.1.0.4       \
                bzip2                    BZ2_bzDecompress [self]
-------------------------------------------------------------------------------
148156   45.8545  decompress.c:107            libbz2.so.1.0.4          bzip2          \
BZ2_decompress  148156   100.000  decompress.c:107            libbz2.so.1.0.4         \
                bzip2                    BZ2_decompress [self]
-------------------------------------------------------------------------------
154       0.0477  bzlib.c:1165                libbz2.so.1.0.4          bzip2          \
BZ2_bzRead  154      100.000  bzlib.c:1165                libbz2.so.1.0.4          \
                bzip2                    BZ2_bzRead [self]
-------------------------------------------------------------------------------
95        0.0294  huffman.c:177               libbz2.so.1.0.4          bzip2          \
BZ2_hbCreateDecodeTables  95       100.000  huffman.c:177               \
                libbz2.so.1.0.4          bzip2                    \
                BZ2_hbCreateDecodeTables [self]
-------------------------------------------------------------------------------
2        6.2e-04  (no location information)   libbz2.so.1.0.4          bzip2          \
.plt  2        100.000  (no location information)   libbz2.so.1.0.4          bzip2    \
                .plt [self]
-------------------------------------------------------------------------------
# uname -a
Linux ns1 2.6.24 #1 SMP Sat Jan 26 09:32:00 GMT 2008 x86_64 Dual-Core AMD Opteron(tm) \
Processor 1216 AuthenticAMD GNU/Linux # opcontrol --version
opcontrol: oprofile 0.9.3 compiled on Jan 27 2008 21:21:22

Oprofile is also compiled into the kernel (not a module).

-cl


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