path: root/Documentation/RCU
diff options
authorPaul E. McKenney <paul.mckenney@linaro.org>2012-01-17 14:36:51 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-02-21 09:03:50 -0800
commit9b9ec9b90ef481e182927989963274dc2697f9a6 (patch)
tree977b0fc115b279c25de3200a6bd4d67f1eff83c8 /Documentation/RCU
parenta858af2875fb291d0f4b0a4419fefbf03c2379c0 (diff)
rcutorture: Permit holding off CPU-hotplug operations during boot
When rcutorture is started automatically at boot time, it might well also start CPU-hotplug operations at that time, which might not be desirable. This commit therefore adds an rcutorture parameter that allows CPU-hotplug operations to be held off for the specified number of seconds after the start of boot. 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')
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index d67068d0d2b9..01a809b1dbc6 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -69,6 +69,13 @@ onoff_interval
CPU-hotplug operations regardless of what value is
specified for onoff_interval.
+onoff_holdoff The number of seconds to wait until starting CPU-hotplug
+ operations. This would normally only be used when
+ rcutorture was built into the kernel and started
+ automatically at boot time, in which case it is useful
+ in order to avoid confusing boot-time code with CPUs
+ coming and going.
The number of seconds to keep the test threads affinitied
to a particular subset of the CPUs, defaults to 3 seconds.
@@ -277,5 +284,7 @@ The following script may be used to torture RCU:
The output can be manually inspected for the error flag of "!!!".
One could of course create a more elaborate script that automatically
-checked for such errors. The "rmmod" command forces a "SUCCESS" or
-"FAILURE" indication to be printk()ed.
+checked for such errors. The "rmmod" command forces a "SUCCESS",
+"FAILURE", or "RCU_HOTPLUG" indication to be printk()ed. The first
+two are self-explanatory, while the last indicates that while there
+were no RCU failures, CPU-hotplug problems were detected.

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