diff options
| author | Antti P Miettinen <ananaza@iki.fi> | 2012-10-05 09:59:15 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-10-23 14:54:08 -0700 |
| commit | 3705b88db0d7cc4a097c32d9e554054103d3f807 (patch) | |
| tree | f3baf8c94363506964c9f944496267f74cdee47c /kernel/rcutiny_plugin.h | |
| parent | ba49df4767d4fa5bbd2af3a51709fb81f94264ec (diff) | |
rcu: Add a module parameter to force use of expedited RCU primitives
There have been some embedded applications that would benefit from
use of expedited grace-period primitives. In some ways, this is
similar to synchronize_net() doing either a normal or an expedited
grace period depending on lock state, but with control outside of
the kernel.
This commit therefore adds rcu_expedited boot and sysfs parameters
that cause the kernel to substitute expedited primitives for the
normal grace-period primitives.
[ paulmck: Add trace/event/rcu.h to kernel/srcu.c to avoid build error.
Get rid of infinite loop through contention path.]
Signed-off-by: Antti P Miettinen <amiettinen@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutiny_plugin.h')
| -rw-r--r-- | kernel/rcutiny_plugin.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h index 3d019028220..f85016a2309 100644 --- a/kernel/rcutiny_plugin.h +++ b/kernel/rcutiny_plugin.h @@ -706,7 +706,10 @@ void synchronize_rcu(void) return; /* Once we get past the fastpath checks, same code as rcu_barrier(). */ - rcu_barrier(); + if (rcu_expedited) + synchronize_rcu_expedited(); + else + rcu_barrier(); } EXPORT_SYMBOL_GPL(synchronize_rcu); |