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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2011-11-16 17:48:21 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-12-11 10:31:56 -0800 |
| commit | b58bdccaa8d908e0f71dae396468a0d3f7bb3125 (patch) | |
| tree | c03e6b8691a6569407c69b3456df88094d70309a /Documentation/RCU | |
| parent | a95f8817f8afa75ab41728bd1bb65024c65c91c3 (diff) | |
| download | lwn-b58bdccaa8d908e0f71dae396468a0d3f7bb3125.tar.gz lwn-b58bdccaa8d908e0f71dae396468a0d3f7bb3125.zip | |
rcu: Add rcutorture CPU-hotplug capability
Running CPU-hotplug operations concurrently with rcutorture has
historically been a good way to find bugs in both RCU and CPU hotplug.
This commit therefore adds an rcutorture module parameter called
"onoff_interval" that causes a randomly selected CPU-hotplug operation to
be executed at the specified interval, in seconds. The default value of
"onoff_interval" is zero, which disables rcutorture-instigated CPU-hotplug
operations.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'Documentation/RCU')
| -rw-r--r-- | Documentation/RCU/torture.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt index af40929e1cb0..d67068d0d2b9 100644 --- a/Documentation/RCU/torture.txt +++ b/Documentation/RCU/torture.txt @@ -61,6 +61,14 @@ nreaders This is the number of RCU reading threads supported. To properly exercise RCU implementations with preemptible read-side critical sections. +onoff_interval + The number of seconds between each attempt to execute a + randomly selected CPU-hotplug operation. Defaults to + zero, which disables CPU hotplugging. In HOTPLUG_CPU=n + kernels, rcutorture will silently refuse to do any + CPU-hotplug operations regardless of what value is + specified for onoff_interval. + shuffle_interval The number of seconds to keep the test threads affinitied to a particular subset of the CPUs, defaults to 3 seconds. |