Red Hat Bugzilla – Bug 695283
function_graph is not listed in /sys/kernel/debug/tracing/available_tracers, but /boot/config shows it as enabled
Last modified: 2011-04-12 11:54:00 EDT
Description of problem:
According to /boot/config-220.127.116.11-83.fc14.i686.PAE, function_graph tracing is configured:
but it doesn't show up in /sys/kernel/debug/tracing/available_tracers
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Mount debugfs at /sys/kernel/debug
2. cat /sys/kernel/debug/tracing/available_tracers
ksym_tracer blk kmemtrace wakeup_rt wakeup function sysprof sched_switch nop
A list that includes function_graph
This problem was reported last year by someone else on LKML with a self-built kernel, but there were no replies on-list.
It's not supported on x86 unless CC_OPTIMIZE_FOR_SIZE is disabled, which is enabled in the Fedora kernel.