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alistair23-linux/tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot

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rcutorture: Exchange TREE03 and TREE08 NR_CPUS, speed up CPU hotplug TREE03 has been especially effective at finding bugs lately. This commit makes it even more effective by speeding up its CPU hotplug testing and increasing its NR_CPUs from 8 to 16. TREE08's NR_CPUS is decreased from 16 to 8 in order to maintain the same test duration. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2015-03-12 12:42:48 -06:00
rcutorture.onoff_interval=1 rcutorture.onoff_holdoff=30
rcu: Move grace-period pre-init delay after pre-init The main race with the early part of grace-period initialization appears to be with CPU hotplug. To more fully open this race window, this commit moves the rcu_gp_slow() from the beginning of the early initialization loop to follow that loop, thus widening the race window, especially for the rcu_node structures that are initialized last. This commit also expands rcutree.gp_preinit_delay from 3 to 12, giving the same overall delay in the grace period, but concentrated in the spot where it will do the most good. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2018-05-03 14:40:25 -06:00
rcutree.gp_preinit_delay=12
rcu: Remove *_SLOW_* Kconfig options The RCU_TORTURE_TEST_SLOW_PREINIT, RCU_TORTURE_TEST_SLOW_PREINIT_DELAY, RCU_TORTURE_TEST_SLOW_PREINIT_DELAY, RCU_TORTURE_TEST_SLOW_INIT, RCU_TORTURE_TEST_SLOW_INIT_DELAY, RCU_TORTURE_TEST_SLOW_CLEANUP, and RCU_TORTURE_TEST_SLOW_CLEANUP_DELAY Kconfig options are only useful for torture testing, and there are the rcutree.gp_cleanup_delay, rcutree.gp_init_delay, and rcutree.gp_preinit_delay kernel boot parameters that rcutorture can use instead. The effect of these parameters is to artificially slow down grace period initialization and cleanup in order to make some types of race conditions happen more often. This commit therefore simplifies Tree RCU a bit by removing the Kconfig options and adding the corresponding kernel parameters to rcutorture's .boot files instead. However, this commit also leaves out the kernel parameters for TREE02, TREE04, and TREE07 in order to have about the same number of tests slowed as not slowed. TREE01, TREE03, TREE05, and TREE06 are slowed, and the rest are not slowed. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2017-05-10 15:36:55 -06:00
rcutree.gp_init_delay=3
rcutree.gp_cleanup_delay=3
rcu: Remove the RCU_KTHREAD_PRIO Kconfig option Anything that can be done with the RCU_KTHREAD_PRIO Kconfig option can also be done with the rcutree.kthread_prio kernel boot parameter. This commit therefore removes this Kconfig option. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Rik van Riel <riel@redhat.com>
2017-05-10 16:57:16 -06:00
rcutree.kthread_prio=2