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srcu: Print non-default exp_holdoff values at boot time

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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>
This commit is contained in:
Paul E. McKenney 2017-04-28 11:24:22 -07:00
parent b5815e6cd3
commit 0c8e0e3c37
1 changed files with 5 additions and 1 deletions
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6
kernel/rcu/srcutree.c
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@ -40,7 +40,9 @@
#include "rcu.h" #include "rcu.h"
#include "rcu_segcblist.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); module_param(exp_holdoff, ulong, 0444);
static void srcu_invoke_callbacks(struct work_struct *work); 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) static int __init srcu_bootup_announce(void)
{ {
pr_info("Hierarchical SRCU implementation.\n"); 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; return 0;
} }
early_initcall(srcu_bootup_announce); early_initcall(srcu_bootup_announce);