On Sun, Oct 02, 2016 at 03:46:38AM +0200, Jason A. Donenfeld wrote:
> Since padata has a maximum number of inflight jobs, currently 1000, it's
> very useful to know how many jobs are currently queued up. This adds a
> simple helper function to expose this information.
>
> Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
> ---
> include/linux/padata.h | 2 ++
> kernel/padata.c | 16 ++++++++++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/include/linux/padata.h b/include/linux/padata.h
> index 113ee62..4840ae4 100644
> --- a/include/linux/padata.h
> +++ b/include/linux/padata.h
> @@ -3,6 +3,7 @@
> *
> * Copyright (C) 2008, 2009 secunet Security Networks AG
> * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
> + * Copyright (C) 2016 Jason A. Donenfeld <Jason@xxxxxxxxx>
> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms and conditions of the GNU General Public License,
> @@ -181,4 +182,5 @@ extern int padata_register_cpumask_notifier(struct padata_instance *pinst,
> struct notifier_block *nblock);
> extern int padata_unregister_cpumask_notifier(struct padata_instance *pinst,
> struct notifier_block *nblock);
> +extern int padata_queue_len(struct padata_instance *pinst);
> #endif
> diff --git a/kernel/padata.c b/kernel/padata.c
> index 9932788..17c1e08 100644
> --- a/kernel/padata.c
> +++ b/kernel/padata.c
> @@ -5,6 +5,7 @@
> *
> * Copyright (C) 2008, 2009 secunet Security Networks AG
> * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
> + * Copyright (C) 2016 Jason A. Donenfeld <Jason@xxxxxxxxx>
> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms and conditions of the GNU General Public License,
> @@ -1039,3 +1040,18 @@ void padata_free(struct padata_instance *pinst)
> kobject_put(&pinst->kobj);
> }
> EXPORT_SYMBOL(padata_free);
> +
> +/**
> + * padata_queue_len - retreive the number of in progress jobs
> + *
> + * @padata_inst: padata instance from which to read the queue size
> + */
> +int padata_queue_len(struct padata_instance *pinst)
> +{
> + int len;
> + rcu_read_lock_bh();
> + len = atomic_read(&rcu_dereference_bh(pinst->pd)->refcnt);
> + rcu_read_unlock_bh();
> + return len;
> +}
> +EXPORT_SYMBOL(padata_queue_len);
Why you want to have this? Without having a user of this function,
there is no point on adding it.
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