On Sat, Jan 15, 2011 at 03:28:57PM +0100, Ingo Molnar wrote: > > * tip-bot for Paul E. McKenney <paul.mckenney@xxxxxxxxxx> wrote: > > > Commit-ID: b24efdfdf679cf9b05947c531971905fc727dd40 > > Gitweb: http://git.kernel.org/tip/b24efdfdf679cf9b05947c531971905fc727dd40 > > Author: Paul E. McKenney <paul.mckenney@xxxxxxxxxx> > > AuthorDate: Wed, 12 Jan 2011 14:18:11 -0800 > > Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> > > CommitDate: Fri, 14 Jan 2011 04:58:08 -0800 > > > > rcu: avoid pointless blocked-task warnings > > > > If the RCU callback-processing kthread has nothing to do, it parks in > > a wait_event(). If RCU remains idle for more than two minutes, the > > kernel complains about this. This commit changes from wait_event() > > to wait_event_interruptible() to prevent the kernel from complaining > > just because RCU is idle. > > Btw., a sidenote, it's not just about the blocked-tasks lockup detector warning, > uninterruptible sleeps will also artificially inflate the load average of the box, > +1.0 per such task. So it's definitely a bug to sleep for a very long time > uninterruptible. Good point, and I have made the corresponding change in the in-progress TREE_PREEMPT_RCU variant of RCU priority boosting. Some thought will be required when merging SRCU into the Tiny and Tree RCU implementations. ;-) Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html