Messages in this thread | | | Date | Sun, 08 Jul 2012 19:53:58 -0600 | From | David Ahern <> | Subject | Re: perf lock record fails |
| |
On 7/6/12 7:06 PM, Namhyung Kim wrote: > Hi, David > > On Fri, 06 Jul 2012 11:27:39 -0600, David Ahern wrote: >> What config options need to be enabled for 'perf lock record' to work? >> I tried a number of custom builds and stock Fedora kernels. I always >> get: >> >> $ perf lock record -- sleep 1 >> invalid or unsupported event: 'lock:lock_acquire' >> >> Though trace_lock_acquire exists, CONFIG_LOCKDEP is set, and ftrace is >> enabled. >> >> What am I missing? >> > > Weird. AFAICS lock_acquire and lock_release depend on CONFIG_LOCKDEP, > and lock_acquired and lock_contented depend on CONFIG_LOCK_STAT (I guess > it should be warned/commented somewhere?). Maybe CONFIG_EVENT_TRACING?
CONFIG_EVENT_TRACING is set.
I started a comparison with other tracepoints to see if I can decipher why they show up but none of the trace functions for the lock system do (e.g., lock_acquire), but haven't had much time to spend on it. I was hoping Steve or Frederic could explain it quicker. ;-)
David
| |