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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-11-25 00:44:06 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-12-04 21:26:53 +0100
commit5a9be7c628c5273f84abacebf7faf2488376e0f0 (patch)
tree4d39aabecb8cc7542a053b3f9761f8e119f25450 /Documentation/kernel-parameters.txt
parentrcu: Add more diagnostics to expedited stall warning messages. (diff)
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rcu: Add rcu_normal kernel parameter to suppress expediting
Although expedited grace periods can be quite useful, and although their OS jitter has been greatly reduced, they can still pose problems for extreme real-time workloads. This commit therefore adds a rcu_normal kernel boot parameter (which can also be manipulated via sysfs) to suppress expedited grace periods, that is, to treat requests for expedited grace periods as if they were requests for normal grace periods. If both rcu_expedited and rcu_normal are specified, rcu_normal wins. This means that if you are relying on expedited grace periods to speed up boot, you will want to specify rcu_expedited on the kernel command line, and then specify rcu_normal via sysfs once boot completes. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt19
1 files changed, 14 insertions, 5 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 742f69d18fc8..7673943d3085 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3296,6 +3296,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
rcutorture.verbose= [KNL]
Enable additional printk() statements.
+ rcupdate.rcu_cpu_stall_suppress= [KNL]
+ Suppress RCU CPU stall warning messages.
+
+ rcupdate.rcu_cpu_stall_timeout= [KNL]
+ Set timeout for RCU CPU stall warning messages.
+
rcupdate.rcu_expedited= [KNL]
Use expedited grace-period primitives, for
example, synchronize_rcu_expedited() instead
@@ -3303,11 +3309,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
but can increase CPU utilization, degrade
real-time latency, and degrade energy efficiency.
- rcupdate.rcu_cpu_stall_suppress= [KNL]
- Suppress RCU CPU stall warning messages.
-
- rcupdate.rcu_cpu_stall_timeout= [KNL]
- Set timeout for RCU CPU stall warning messages.
+ rcupdate.rcu_normal= [KNL]
+ Use only normal grace-period primitives,
+ for example, synchronize_rcu() instead of
+ synchronize_rcu_expedited(). This improves
+ real-time latency, CPU utilization, and energy
+ efficiency, but can expose users to increased
+ grace-period latency. This parameter overrides
+ rcupdate.rcu_expedited.
rcupdate.rcu_task_stall_timeout= [KNL]
Set timeout in jiffies for RCU task stall warning