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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-06-25 15:41:11 (GMT) |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-09-23 14:41:54 (GMT) |
| commit | b4be093fee0200789df59b6c90e2d099a20f55b3 (patch) | |
| tree | 5eb8367be67bde57671240bfeb149c4c670ffd1c /Documentation/RCU/trace.txt | |
| parent | 4cdfc175c25c89eedc08460b5e6239c2ec67fcb6 (diff) | |
| download | linux-b4be093fee0200789df59b6c90e2d099a20f55b3.tar.xz | |
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>
Diffstat (limited to 'Documentation/RCU/trace.txt')
0 files changed, 0 insertions, 0 deletions