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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-06-25 08:41:11 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 07:41:54 -0700
commitb4be093fee0200789df59b6c90e2d099a20f55b3 (patch)
tree5eb8367be67bde57671240bfeb149c4c670ffd1c /Documentation/RCU/trace.txt
parent4cdfc175c25c89eedc08460b5e6239c2ec67fcb6 (diff)
rcu: Allow RCU quiescent-state forcing to be preempted
RCU quiescent-state forcing is currently carried out without preemption points, which can result in excessive latency spikes on large systems (many hundreds or thousands of CPUs). This patch therefore inserts a voluntary preemption point into force_qs_rnp(), which should greatly reduce the magnitude of these spikes. Reported-by: Mike Galbraith <mgalbraith@suse.de> Reported-by: Dimitri Sivanich <sivanich@sgi.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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