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Description of problem: I'm trying to profile Firefox Nightly with oprofile. I am attempting to start Nightly with the command $ operf -d ~/nightly_operf/ FirefoxNightly/firefox/firefox Unexpected error running operf: Permission denied Version-Release number of selected component (if applicable): $ dnf list installed | grep oprofile oprofile.x86_64 1.1.0-4.fc24 @fedora oprofile-devel.x86_64 1.1.0-4.fc24 @fedora oprofile-jit.x86_64 1.1.0-4.fc24 @fedora How reproducible: Consistent - always happens Steps to Reproduce: 1. Install Firefox Nightly from Mozilla 2. Create ~/nightly_operf 3. Run operf -d ~/nightly_operf/ FirefoxNightly/firefox/firefox Actual results: Permission denied Expected results: Firetox Nightly started and oprofile collecting data into ~/nightly_operf Additional info:
This is likely due to newer kernels having /proc/sys/kernel/perf_event_paranoid default to 2 rather than 1 as in older kernels. oprofile doesn't exclude kernel-space measurements, so the set up of the performance monitoring of operf is failing. To verify that this is the case as root: echo 1 > /proc/sys/kernel/perf_event_paranoid Then retry the operf command as a normal user.
Yep - it worked ... so there's probably a note needed in the documentation for Fedora 25. There's nothing about this in https://docs.fedoraproject.org/en-US/Fedora/24/html/System_Administrators_Guide/ch-OProfile.html
I also ran into this today.
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Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.