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authorPaul E. McKenney <paulmck@kernel.org>2019-09-14 12:39:22 +0200
committerPaul E. McKenney <paulmck@kernel.org>2019-10-28 15:02:21 +0100
commitdd7dafd1ad50aa9ed7958235431f243ea131ee7d (patch)
tree6fab5bcf3edee0e5349f4e4e4005369e7fb5421c /scripts
parentrcu: Confine ->core_needs_qs accesses to the corresponding CPU (diff)
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rcu: Make kernel-mode nohz_full CPUs invoke the RCU core processing
If a nohz_full CPU is idle or executing in userspace, it makes good sense to keep it out of RCU core processing. After all, the RCU grace-period kthread can see its quiescent states and all of its callbacks are offloaded, so there is nothing for RCU core processing to do. However, if a nohz_full CPU is executing in kernel space, the RCU grace-period kthread cannot do anything for it, so such a CPU must report its own quiescent states. This commit therefore makes nohz_full CPUs skip RCU core processing only if the scheduler-clock interrupt caught them in idle or in userspace. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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