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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-11-26 03:56:00 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-12-04 21:26:54 +0100
commit3e42ec1aa716f10c68294b8492ae3ea684528699 (patch)
treebe431b624157914bd08d965fed9423fe267ff927 /Documentation/kernel-parameters.txt
parentrcu: Wire up rcu_end_inkernel_boot() (diff)
downloadlinux-3e42ec1aa716f10c68294b8492ae3ea684528699.tar.xz
linux-3e42ec1aa716f10c68294b8492ae3ea684528699.zip
rcu: Allow expedited grace periods to be disabled at init
Expedited grace periods can speed up boot, but are undesirable in aggressive real-time systems. This commit therefore introduces a kernel parameter rcupdate.rcu_normal_after_boot that disables expedited grace periods just before init is spawned. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7673943d3085..197305bbb9b7 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3318,6 +3318,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
grace-period latency. This parameter overrides
rcupdate.rcu_expedited.
+ rcupdate.rcu_normal_after_boot= [KNL]
+ Once boot has completed (that is, after
+ rcu_end_inkernel_boot() has been invoked), use
+ only normal grace-period primitives.
+
rcupdate.rcu_task_stall_timeout= [KNL]
Set timeout in jiffies for RCU task stall warning
messages. Disable with a value less than or equal