Commit-ID: 0c8e0e3c37955d17cced37222a10c00ab47efd4b
Gitweb: http://git.kernel.org/tip/0c8e0e3c37955d17cced37222a10c00ab47efd4b
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Fri, 28 Apr 2017 11:24:22 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Thu, 8 Jun 2017 08:25:36 -0700
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@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/srcutree.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 08d4373..0b6ea10 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);
--
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