Description of problem: latencytop reports the following when trying to start it: Failed to open /proc/latency_stats: No such file or directory Please enable the CONFIG_LATENCYTOP configuration in your kernel. Version-Release number of selected component (if applicable): kernel-3.12.5-200.fc19.x86_64 How reproducible: Always. Steps to Reproduce: 1. Install latencytop. 2. Run latencytop. 3. See latencytop fail. Actual results: latencytop reports CONFIG_LATENCYTOP not enabled Expected results: latencytop starts to measure system latencies. Additional info: $ grep CONFIG_LATENCYTOP /boot/config-* /boot/config-3.11.10-200.fc19.x86_64:# CONFIG_LATENCYTOP is not set /boot/config-3.11.9-200.fc19.x86_64:# CONFIG_LATENCYTOP is not set /boot/config-3.12.5-200.fc19.x86_64:# CONFIG_LATENCYTOP is not set
For completeness: $ grep CONFIG_LATENCYTOP ./boot/config-* ./boot/config-3.12.5-302.fc20.x86_64:# CONFIG_LATENCYTOP is not set ./boot/config-3.13.0-0.rc4.git5.1.fc21.x86_64:# CONFIG_LATENCYTOP is not set Thse are the current and updatest-testing Fedora 20 kernels. Feel free to convert this bug to Fedora 20 if it helps.
That is a debug option that incurs additional overhead and a performance hit. It also enables SCHEDSTATS which we currently have disabled because of bug 1013225. *** This bug has been marked as a duplicate of bug 1013225 ***