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SubjectRe: [PATCH rcu 2/3] doc: Document the rcutree.rcu_divisor kernel boot parameter
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On 6/21/2022 3:47 AM, Paul E. McKenney wrote:
> 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>

> Documentation/admin-guide/kernel-parameters.txt | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 2522b11e593f2..bdf431bdbfdc4 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -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

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