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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/rcupdate.c
parentba49df4767d4fa5bbd2af3a51709fb81f94264ec (diff)
downloadvexpress-lsk-3705b88db0d7cc4a097c32d9e554054103d3f807.tar.gz
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/rcupdate.c')
-rw-r--r--kernel/rcupdate.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 29ca1c6da59..a2cf76177b4 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -46,12 +46,15 @@
#include <linux/export.h>
#include <linux/hardirq.h>
#include <linux/delay.h>
+#include <linux/module.h>
#define CREATE_TRACE_POINTS
#include <trace/events/rcu.h>
#include "rcu.h"
+module_param(rcu_expedited, int, 0);
+
#ifdef CONFIG_PREEMPT_RCU
/*