[Bug 237421] New: Bad cpuTime retrieved from Sys::Virt::Domain->get_info

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Sun Apr 22 14:23:06 UTC 2007


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https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=237421

           Summary: Bad cpuTime retrieved from Sys::Virt::Domain->get_info
           Product: Fedora Extras
           Version: fc6
          Platform: i686
        OS/Version: Linux
            Status: NEW
          Severity: medium
          Priority: medium
         Component: perl-Sys-Virt
        AssignedTo: steve at silug.org
        ReportedBy: g+fedora at pkg.fr
         QAContact: extras-qa at fedoraproject.org
                CC: berrange at redhat.com,fedora-perl-devel-list at redhat.com


Description of problem:
I tried the API on a AMD Athlon(tm) XP 3000+, I got bad values with some
negative one for the cpuTime of a domain.

Version-Release number of selected component (if applicable):
perl-Sys-Virt-0.1.1

How reproducible:
every time

Steps to Reproduce:
1. Run a server with some xen domains
2. Try the example included in the package:
/usr/share/doc/perl-Sys-Virt-0.1.1/examples/dump-info.pl
3. Observe the "cpuTime" values
  
Actual results:
False

Expected results:
Good

Additional info:
I search the sources and I found this value is in fact unsigned long long value
in libvirt library to represent nanoseconds (cf
http://libvirt.org/html/libvirt-libvirt.html#virDomainInfo). I didn't try on a
64 bits arch but I think the it could work on it.

I managed to obtain the expected results by patching the sources: I edit Virt.xs
from the source and changed the line 359 from:
      hv_store (RETVAL, "cpuTime", 7, newSViv(info.cpuTime), 0);
to
      hv_store (RETVAL, "cpuTime", 7, newSVnv(info.cpuTime), 0);

So the unsigned long long is read as a float scalar and not an integer scalar.

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