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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> | 2017-06-08 08:25:36 -0700 |
| commit | 0c8e0e3c37955d17cced37222a10c00ab47efd4b (patch) | |
| tree | 82b1a3ec2ffa39a38da69d52231a0b2e2560f87f /kernel | |
| parent | b5815e6cd3b747cacf7628a32a275aa2c0f61e06 (diff) | |
| download | linux-0c8e0e3c37955d17cced37222a10c00ab47efd4b.tar.gz linux-0c8e0e3c37955d17cced37222a10c00ab47efd4b.tar.bz2 linux-0c8e0e3c37955d17cced37222a10c00ab47efd4b.zip | |
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.c | 6 |
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); |