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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/srcu.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/srcu.c')
| -rw-r--r-- | kernel/srcu.c | 8 |
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); |