[llvm-bugs] [Bug 41469] New: [lnt][test-suite] cPerf (?) is broken for gcc-compiled code

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Apr 11 13:09:04 PDT 2019


            Bug ID: 41469
           Summary: [lnt][test-suite] cPerf (?) is broken for gcc-compiled
           Product: LNT
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LNT
          Assignee: unassignedbugs at nondot.org
          Reporter: lebedev.ri at gmail.com
                CC: chris.matthews at apple.com, llvm-bugs at lists.llvm.org

I don't really have a reproducer as i'm observing this on
but i don't think it is specific to any project.
* With both the clang and gcc:
  The `--use-perf profile` works, `.perf_data` is captured
  It is nicely viewable via `perf report -i`, has correct data (!!!)
* If clang was used,  within the `lnt runserver` ui profile view,
  the profile is fully correct, displays the right functions as hot,
  correctly displays their asm
* Within the `lnt runserver` ui profile view, the profile is broken,
  displays completely unrelated functions as hot,
  not the ones that are actually hot.

I'm not quite sure where to dig yet.
Does this maybe sound familiar to anyone?

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