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doc: Document the rcutree.rcu_divisor kernel boot parameter

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This commit adds kernel-parameters.txt documentation for the
rcutree.rcu_divisor kernel boot parameter, which controls the softirq
callback-invocation batch limit.

Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Neeraj Upadhyay <quic_neeraju@quicinc.com>
This commit is contained in:
Paul E. McKenney 2022-04-20 08:59:46 -07:00
parent cb506e130e
commit 71de1e34f1
1 changed files with 15 additions and 0 deletions
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15
Documentation/admin-guide/kernel-parameters.txt
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@ -4666,6 +4666,21 @@
When RCU_NOCB_CPU is set, also adjust the
priority of NOCB callback kthreads.
rcutree.rcu_divisor= [KNL]
Set the shift-right count to use to compute
the callback-invocation batch limit bl from
the number of callbacks queued on this CPU.
The result will be bounded below by the value of
the rcutree.blimit kernel parameter. Every bl
callbacks, the softirq handler will exit in
order to allow the CPU to do other work.
Please note that this callback-invocation batch
limit applies only to non-offloaded callback
invocation. Offloaded callbacks are instead
invoked in the context of an rcuoc kthread, which
scheduler will preempt as it does any other task.
rcutree.rcu_nocb_gp_stride= [KNL]
Set the number of NOCB callback kthreads in
each group, which defaults to the square root