summaryrefslogtreecommitdiff
path: root/kernel/srcu.c
diff options
context:
space:
mode:
authorAntti P Miettinen <ananaza@iki.fi>2012-10-05 09:59:15 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-10-23 14:54:08 -0700
commit3705b88db0d7cc4a097c32d9e554054103d3f807 (patch)
treef3baf8c94363506964c9f944496267f74cdee47c /kernel/srcu.c
parentba49df4767d4fa5bbd2af3a51709fb81f94264ec (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/srcu.c')
-rw-r--r--kernel/srcu.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/srcu.c b/kernel/srcu.c
index 97c465ebd844..de9074047c92 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -34,6 +34,10 @@
#include <linux/delay.h>
#include <linux/srcu.h>
+#include <trace/events/rcu.h>
+
+#include "rcu.h"
+
/*
* Initialize an rcu_batch structure to empty.
*/
@@ -464,7 +468,9 @@ static void __synchronize_srcu(struct srcu_struct *sp, int trycount)
*/
void synchronize_srcu(struct srcu_struct *sp)
{
- __synchronize_srcu(sp, SYNCHRONIZE_SRCU_TRYCOUNT);
+ __synchronize_srcu(sp, rcu_expedited
+ ? SYNCHRONIZE_SRCU_EXP_TRYCOUNT
+ : SYNCHRONIZE_SRCU_TRYCOUNT);
}
EXPORT_SYMBOL_GPL(synchronize_srcu);