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authorAlison Chaiken <achaiken@aurora.tech>2022-01-11 15:32:52 -0800
committerPaul E. McKenney <paulmck@kernel.org>2022-02-01 17:19:25 -0800
commitc8b16a65267e35ecc5621dbc81cbe7e5b0992fce (patch)
tree99ff340a284841b875aa4ca4b2d146ce97ebf181 /lib/bitrev.c
parent54577e23fa0791599db1a3d86fc8e7a205d3da75 (diff)
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rcu: Elevate priority of offloaded callback threads
When CONFIG_PREEMPT_RT=y, the rcutree.kthread_prio command-line parameter signals initialization code to boost the priority of rcuc callbacks to the designated value. With the additional CONFIG_RCU_NOCB_CPU=y configuration and an additional rcu_nocbs command-line parameter, the callbacks on the listed cores are offloaded to new rcuop kthreads that are not pinned to the cores whose post-grace-period work is performed. While the rcuop kthreads perform the same function as the rcuc kthreads they offload, the kthread_prio parameter only boosts the priority of the rcuc kthreads. Fix this inconsistency by elevating rcuop kthreads to the same priority as the rcuc kthreads. Signed-off-by: Alison Chaiken <achaiken@aurora.tech> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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