On Fri, Jun 20, 2014 at 11:32:49AM -0700, Paul E. McKenney wrote: > Hello! > > This series contains changes to address the performance regressions > introduced by commit ac1bea85781e (Make cond_resched() report RCU > quiescent states), which was in turn fixing a problem where tasks looping > in the kernel could delay RCU grace periods. The changes in this series > are as follows: > > 1. Reduce the overhead of checking added to cond_resched() and friends. > > 2. Add a new cond_resched_rcu_qs() to provide RCU quiescent states > even if cond_resched() should stop doing so. > > 3. Add a new RCU_COND_RESCHED_QS to prevent cond_resched() from > reporting RCU quiescent states. > > 4. Prevent rcutorture testing from reporting spurious RCU CPU stall > warnings, and also to test RCU_COND_RESCHED_QS. > > 5. Provides a boot/sysfs rcutree.jiffies_till_cond_resched_qs > parameter to replace the magic "7".
For all five patches: Reviewed-by: Josh Triplett <j...@joshtriplett.org> Glad to see this doesn't add any overhead to rcutiny. - Josh Triplett -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
