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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-04-27 07:52:35 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-04-27 08:35:24 -0700
commitb5fe223a4bd0217a657ff084e48752c367a8a55f (patch)
treea5cf2250c8a7962c198089c3eb6b7236aa9cbc0a /kernel
parent96fd20cf3f1620d699db43cd08745f1e57e1072a (diff)
downloadlinux-b5fe223a4bd0217a657ff084e48752c367a8a55f.tar.bz2
srcu: Adjust default auto-expediting holdoff
The default value for the kernel boot parameter srcutree.exp_holdoff is 50 microseconds, which is too long for good Tree SRCU performance (compared to Classic SRCU) on the workloads tested by Mike Galbraith. This commit therefore sets the default value to 25 microseconds, which shows excellent results in Mike's testing. Reported-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Mike Galbraith <efault@gmx.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcu/srcutree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 74c283f9d15e..87b070de6371 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -39,7 +39,7 @@
#include "rcu.h"
-ulong exp_holdoff = 50 * 1000; /* Holdoff (ns) for auto-expediting. */
+ulong exp_holdoff = 25 * 1000; /* Holdoff (ns) for auto-expediting. */
module_param(exp_holdoff, ulong, 0444);
static void srcu_invoke_callbacks(struct work_struct *work);