[Intel-wired-lan] [PATCH v2 1/4] sched/isolation: API to get housekeeping online CPUs
peterz at infradead.org
peterz at infradead.org
Thu Sep 24 08:40:29 UTC 2020
On Wed, Sep 23, 2020 at 02:11:23PM -0400, Nitesh Narayan Lal wrote:
> Introduce a new API hk_num_online_cpus(), that can be used to
> retrieve the number of online housekeeping CPUs that are meant to handle
> managed IRQ jobs.
>
> This API is introduced for the drivers that were previously relying only
> on num_online_cpus() to determine the number of MSIX vectors to create.
> In an RT environment with large isolated but fewer housekeeping CPUs this
> was leading to a situation where an attempt to move all of the vectors
> corresponding to isolated CPUs to housekeeping CPUs were failing due to
> per CPU vector limit.
>
> Signed-off-by: Nitesh Narayan Lal <nitesh at redhat.com>
> ---
> include/linux/sched/isolation.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
> index cc9f393e2a70..2e96b626e02e 100644
> --- a/include/linux/sched/isolation.h
> +++ b/include/linux/sched/isolation.h
> @@ -57,4 +57,17 @@ static inline bool housekeeping_cpu(int cpu, enum hk_flags flags)
> return true;
> }
>
> +static inline unsigned int hk_num_online_cpus(void)
This breaks with the established naming of that header.
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