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| 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/rcupdate.c | |
| parent | ba49df4767d4fa5bbd2af3a51709fb81f94264ec (diff) | |
| download | lwn-3705b88db0d7cc4a097c32d9e554054103d3f807.tar.gz lwn-3705b88db0d7cc4a097c32d9e554054103d3f807.zip | |
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.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index 29ca1c6da594..a2cf76177b44 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 /* |