From: "Paul E. McKenney" <paulmck@xxxxxxxxxx> This commit documents recently added locktorture module parameters. Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> Signed-off-by: Frederic Weisbecker <frederic@xxxxxxxxxx> --- .../admin-guide/kernel-parameters.txt | 50 +++++++++++++++++-- 1 file changed, 47 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 300e2c30986c..47f8b1cef4fd 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2913,6 +2913,11 @@ to extract confidential information from the kernel are also disabled. + locktorture.acq_writer_lim= [KNL] + Set the time limit in jiffies for a lock + acquisition. Acquisitions exceeding this limit + will result in a splat once they do complete. + locktorture.call_rcu_chains= [KNL] Specify the number of self-propagating call_rcu() chains to set up. These are used to ensure that @@ -2920,6 +2925,18 @@ in progress at any given time. Defaults to 0, which disables these call_rcu() chains. + locktorture.long_hold= [KNL] + Specify the duration in milliseconds for the + occasional long-duration lock hold time. Defaults + to 100 milliseconds. Select 0 to disable. + + locktorture.nested_locks= [KNL] + Specify the maximum lock nesting depth that + locktorture is to exercise, up to a limit of 8 + (MAX_NESTED_LOCKS). Specify zero to disable. + Note that this parameter is ineffective on types + of locks that do not support nested acquisition. + locktorture.nreaders_stress= [KNL] Set the number of locking read-acquisition kthreads. Defaults to being automatically set based on the @@ -2935,6 +2952,29 @@ Set time (s) between CPU-hotplug operations, or zero to disable CPU-hotplug testing. + locktorture.readers_bind= [KNL] + Specify the list of CPUs to which the readers are + to be bound. + + locktorture.rt_boost= [KNL] + Do periodic testing of real-time lock priority + boosting. Select 0 to disable, 1 to boost + only rt_mutex, and 2 to boost unconditionally. + Defaults to 2, which might seem to be an + odd choice, but which should be harmless for + non-real-time spinlocks, due to their disabling + of preemption. Note that non-realtime mutexes + disable boosting. + + locktorture.rt_boost_factor= [KNL] + Number that determines how often and for how + long priority boosting is exercised. This is + scaled down by the number of writers, so that the + number of boosts per unit time remains roughly + constant as the number of writers increases. + On the other hand, the duration of each boost + increases with the number of writers. + locktorture.shuffle_interval= [KNL] Set task-shuffle interval (jiffies). Shuffling tasks allows some CPUs to go into dyntick-idle @@ -2957,13 +2997,17 @@ locktorture.torture_type= [KNL] Specify the locking implementation to test. + locktorture.verbose= [KNL] + Enable additional printk() statements. + + locktorture.writers_bind= [KNL] + Specify the list of CPUs to which the writers are + to be bound. + locktorture.writer_fifo= [KNL] Run the write-side locktorture kthreads at sched_set_fifo() real-time priority. - locktorture.verbose= [KNL] - Enable additional printk() statements. - logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver Format: <irq> -- 2.34.1
