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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-04-28 11:24:22 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-05-16 15:52:00 -0700 |
| commit | 3e230108c5ea9e5bf917ddf656535e69d7a6ccf0 (patch) | |
| tree | 44569f98d3139bd63813af1f98f028b5b6b22483 /kernel/rcu | |
| parent | c11e41416231bec9519751eec4c1b3cc57cfdf01 (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/rcu')
| -rw-r--r-- | kernel/rcu/srcutree.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index 021a9521a8b8..a46142de5133 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); @@ -1172,6 +1174,8 @@ 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); |