-- On Fri, 24 Aug 2007, john stultz wrote: > > > > - /* calculate the delta since the last update_wall_time: */ > > - cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; > > + } while (cycle_raw != clock->cycle_raw || > > + cycle_last != clock->cycle_last); > > So if I'm understanding this right, not taking a lock isn't an > optimization (as the seq read lock code is almost the same), but a > requirement (as this might be called while xtime_lock is held), > correct? Exactly. The latency tracer uses this so no locks can be grabbed (seq_locks included). > > Might want to clarify that a bit in the comment. > OK, will do and send a updated patch. I wasn't in the best state writing this patch in the wee hours of the night ;-) -- Steve - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
