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rcu: Add a module parameter to force use of expedited RCU primitives

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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>
This commit is contained in:
Antti P Miettinen 2012-10-05 09:59:15 +03:00 • committed by Paul E. McKenney
parent ba49df4767
commit 3705b88db0
7 changed files with 48 additions and 7 deletions
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8
kernel/srcu.c
View file

@ -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);