On 03/20/11 13:08, Thomas Gleixner wrote: > On Sun, 20 Mar 2011, David Ahern wrote: >> + >> + if (sample_type & PERF_SAMPLE_REALTIME) >> + data->realtime = ktime_to_ns(ktime_get_real()); > > That's going to live lock on any sample which happens to hit in a > xtime_lock write locked section. I knew why I suggested adding > tracepoints to the timekeeping code :)
Hmmm.... Can you give an example of when perf samples could be generated with xtime write locked? What are the rules for when ktime_get_real can be invoked? David > > Thanks, > > tglx -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
