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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-04-28 11:24:22 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-06-08 08:25:36 -0700
commit0c8e0e3c37955d17cced37222a10c00ab47efd4b (patch)
tree82b1a3ec2ffa39a38da69d52231a0b2e2560f87f /kernel
parentb5815e6cd3b747cacf7628a32a275aa2c0f61e06 (diff)
srcu: Print non-default exp_holdoff values at boot time
This commit makes srcu_bootup_announce() check for non-default values of the auto-expedite holdoff time exp_holdoff and print a message if so. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcu/srcutree.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 08d43736f72a..0b6ea105d9f8 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -40,7 +40,9 @@
#include "rcu.h"
#include "rcu_segcblist.h"
-static ulong exp_holdoff = 25 * 1000; /* Holdoff (ns) for auto-expediting. */
+/* Holdoff in nanoseconds for auto-expediting. */
+#define DEFAULT_SRCU_EXP_HOLDOFF (25 * 1000)
+static ulong exp_holdoff = DEFAULT_SRCU_EXP_HOLDOFF;
module_param(exp_holdoff, ulong, 0444);
static void srcu_invoke_callbacks(struct work_struct *work);
@@ -1171,6 +1173,8 @@ EXPORT_SYMBOL_GPL(srcutorture_get_gp_data);
static int __init srcu_bootup_announce(void)
{
pr_info("Hierarchical SRCU implementation.\n");
+ if (exp_holdoff != DEFAULT_SRCU_EXP_HOLDOFF)
+ pr_info("\tNon-default auto-expedite holdoff of %lu ns.\n", exp_holdoff);
return 0;
}
early_initcall(srcu_bootup_announce);