Re: [PATCH tip/core/rcu 0/2] v2 Add callback-free CPUs

2012-10-31 Thread Paul E. McKenney
On Wed, Oct 31, 2012 at 08:25:21AM +0100, Peter Zijlstra wrote: > On Tue, 2012-10-30 at 20:45 -0700, Paul E. McKenney wrote: > > This commit therefore adds the ability > > for selected CPUs ("rcu_nocbs=" boot parameter) to have their > > callbacks > > offloaded to kthreads, inspired by Joe Korty's

Re: [PATCH tip/core/rcu 0/2] v2 Add callback-free CPUs

2012-10-31 Thread Peter Zijlstra
On Tue, 2012-10-30 at 20:45 -0700, Paul E. McKenney wrote: > This commit therefore adds the ability > for selected CPUs ("rcu_nocbs=" boot parameter) to have their > callbacks > offloaded to kthreads, inspired by Joe Korty's and Jim Houston's JRCU. > If the "rcu_nocb_poll" boot parameter is also sp

[PATCH tip/core/rcu 0/2] v2 Add callback-free CPUs

2012-10-30 Thread Paul E. McKenney
Hello! RCU callback execution can add significant OS jitter and also can degrade scheduling latency. This commit therefore adds the ability for selected CPUs ("rcu_nocbs=" boot parameter) to have their callbacks offloaded to kthreads, inspired by Joe Korty's and Jim Houston's JRCU. If the "rcu_no