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| author | Paul E. McKenney <paulmck@kernel.org> | 2024-10-10 11:42:53 -0700 |
|---|---|---|
| committer | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-12-14 17:01:05 +0100 |
| commit | 584975ccb7bd8088e681b0b75335295d0a2c6da1 (patch) | |
| tree | 81ddb80f519cf1b9dfcda88908d98aff7c88d900 /Documentation/admin-guide | |
| parent | 0203b485d26d5b403ff4ed21e4cc85ba9ec0fe67 (diff) | |
| download | ath-584975ccb7bd8088e681b0b75335295d0a2c6da1.tar.gz | |
rcutorture: Add random real-time preemption
This commit adds the rcutorture.preempt_duration kernel module parameter,
which gives the real-time preemption duration in milliseconds (zero to
disable, which is the default) and also the rcutorture.preempt_interval
module parameter, which gives the interval between successive preemptions,
also in milliseconds, defaulting to one second. The CPU to preempt is
chosen at random from those online at that time. Races between preempting
a given CPU and that CPU going offline are ignored, and preemption is
forgone when this occurs.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index dc663c0ca6706..65e5343b46cf9 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5424,6 +5424,22 @@ Set time (jiffies) between CPU-hotplug operations, or zero to disable CPU-hotplug testing. + rcutorture.preempt_duration= [KNL] + Set duration (in milliseconds) of preemptions + by a high-priority FIFO real-time task. Set to + zero (the default) to disable. The CPUs to + preempt are selected randomly from the set that + are online at a given point in time. Races with + CPUs going offline are ignored, with that attempt + at preemption skipped. + + rcutorture.preempt_interval= [KNL] + Set interval (in milliseconds, defaulting to one + second) between preemptions by a high-priority + FIFO real-time task. This delay is mediated + by an hrtimer and is further fuzzed to avoid + inadvertent synchronizations. + rcutorture.read_exit_burst= [KNL] The number of times in a given read-then-exit episode that a set of read-then-exit kthreads |