#263 Using operf with multiple events, samples may be attributed to wrong event

None
closed
None
5
2014-09-11
2013-12-19
No

A serious bug was found that affects operf profiling with
multiple events. Samples for an event may be incorrectly
attributed to another event. For example, profiling on
a Sandybridge laptop with CPU_CLK_UNHALTED and INST_RETIRED
events produces the following summary counts from opreport:

CPU_CLK_UNHALTED |INST_RETIRED |
samples| %| samples| %|


  32412 100.000     20104 100.000 foo

Using operf to produce separate profiles for these two events
results in these sample counts:

CPU_CLK_UNHALTED |
samples| %|


  18962 100.000 foo

INST_RETIRED |
samples| %|


  33464 100.000 foo

The attached patch fixes this bug.

1 Attachments

Discussion

  • Maynard Johnson

    Maynard Johnson - 2014-01-02

    This patch was committed upstream on Dec 20, 2013.

     
  • Maynard Johnson

    Maynard Johnson - 2014-01-02
    • status: open --> open-fixed
    • Group: -->
     
  • Maynard Johnson

    Maynard Johnson - 2014-09-11
    • Status: open-fixed --> closed
     

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