On Tue, Aug 07, 2007 at 09:18:29PM +0200, Peter Zijlstra wrote: > On Tue, 2007-08-07 at 11:48 -0700, Paul E. McKenney wrote: > > This patch implements a new version of RCU which allows its read-side > > critical sections to be preempted. It uses a set of counter pairs > > to keep track of the read-side critical sections and flips them > > when all tasks exit read-side critical section. The details > > of this implementation can be found in this paper - > > > > http://www.rdrop.com/users/paulmck/RCU/OLSrtRCU.2006.08.11a.pdf > > > > This patch was developed as a part of the -rt kernel development and > > meant to provide better latencies when read-side critical sections of > > RCU don't disable preemption. As a consequence of keeping track of RCU > > readers, the readers have a slight overhead (optimizations in the paper). > > This implementation co-exists with the "classic" RCU implementations > > and can be switched to at compiler. > > > > Also includes RCU tracing summarized in debugfs and RCU_SOFTIRQ for > > the preemptible variant of RCU. > > Whickedly complex but very cool stuff! > > Unfortunately I have nothing to contribute other than praise at the > complex yet elegant way you dodged the need for synchronisation. I am glad you like it! Heck, I may have to print this email out, frame it, and hang it on my cube wall. ;-) Thanx, Paul - 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
