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Commit dabb8aa9 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
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rcu: Document kernel command-line parameters 



Bring RCU's kernel command-line parameter documentation up to date.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 8932a63d

Documentation/kernel-parameters.txt

+85 −3
Original line number Diff line number Diff line
@@ -2330,18 +2330,100 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
	ramdisk_size=	[RAM] Sizes of RAM disks in kilobytes

			See Documentation/blockdev/ramdisk.txt.



	rcupdate.blimit=	[KNL,BOOT]

	rcutree.blimit=	[KNL,BOOT]

			Set maximum number of finished RCU callbacks to process

			in one batch.



	rcupdate.qhimark=	[KNL,BOOT]

	rcutree.qhimark=	[KNL,BOOT]

			Set threshold of queued

			RCU callbacks over which batch limiting is disabled.



	rcupdate.qlowmark=	[KNL,BOOT]

	rcutree.qlowmark=	[KNL,BOOT]

			Set threshold of queued RCU callbacks below which

			batch limiting is re-enabled.



	rcutree.rcu_cpu_stall_suppress=	[KNL,BOOT]

			Suppress RCU CPU stall warning messages.



	rcutree.rcu_cpu_stall_timeout= [KNL,BOOT]

			Set timeout for RCU CPU stall warning messages.



	rcutorture.fqs_duration= [KNL,BOOT]

			Set duration of force_quiescent_state bursts.



	rcutorture.fqs_holdoff= [KNL,BOOT]

			Set holdoff time within force_quiescent_state bursts.



	rcutorture.fqs_stutter= [KNL,BOOT]

			Set wait time between force_quiescent_state bursts.



	rcutorture.irqreader= [KNL,BOOT]

			Test RCU readers from irq handlers.



	rcutorture.n_barrier_cbs= [KNL,BOOT]

			Set callbacks/threads for rcu_barrier() testing.



	rcutorture.nfakewriters= [KNL,BOOT]

			Set number of concurrent RCU writers.  These just

			stress RCU, they don't participate in the actual

			test, hence the "fake".



	rcutorture.nreaders= [KNL,BOOT]

			Set number of RCU readers.



	rcutorture.onoff_holdoff= [KNL,BOOT]

			Set time (s) after boot for CPU-hotplug testing.



	rcutorture.onoff_interval= [KNL,BOOT]

			Set time (s) between CPU-hotplug operations, or

			zero to disable CPU-hotplug testing.



	rcutorture.shuffle_interval= [KNL,BOOT]

			Set task-shuffle interval (s).  Shuffling tasks

			allows some CPUs to go into dyntick-idle mode

			during the rcutorture test.



	rcutorture.shutdown_secs= [KNL,BOOT]

			Set time (s) after boot system shutdown.  This

			is useful for hands-off automated testing.



	rcutorture.stall_cpu= [KNL,BOOT]

			Duration of CPU stall (s) to test RCU CPU stall

			warnings, zero to disable.



	rcutorture.stall_cpu_holdoff= [KNL,BOOT]

			Time to wait (s) after boot before inducing stall.



	rcutorture.stat_interval= [KNL,BOOT]

			Time (s) between statistics printk()s.



	rcutorture.stutter= [KNL,BOOT]

			Time (s) to stutter testing, for example, specifying

			five seconds causes the test to run for five seconds,

			wait for five seconds, and so on.  This tests RCU's

			ability to transition abruptly to and from idle.



	rcutorture.test_boost= [KNL,BOOT]

			Test RCU priority boosting?  0=no, 1=maybe, 2=yes.

			"Maybe" means test if the RCU implementation

			under test support RCU priority boosting.



	rcutorture.test_boost_duration= [KNL,BOOT]

			Duration (s) of each individual boost test.



	rcutorture.test_boost_interval= [KNL,BOOT]

			Interval (s) between each boost test.



	rcutorture.test_no_idle_hz= [KNL,BOOT]

			Test RCU's dyntick-idle handling.  See also the

			rcutorture.shuffle_interval parameter.



	rcutorture.torture_type= [KNL,BOOT]

			Specify the RCU implementation to test.



	rcutorture.verbose= [KNL,BOOT]

			Enable additional printk() statements.



	rdinit=		[KNL]

			Format: <full_path>

			Run specified binary instead of /init from the ramdisk,