linux-kernel - Re: [PATCH 2/8] Add interface for queuing work on a specific CPU

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Date:	Thu, 7 Feb 2008 01:45:03 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, Alan.Brunelle@...com,
	arjan@...ux.intel.com, dgc@....com, npiggin@...e.de,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: [PATCH 2/8] Add interface for queuing work on a specific CPU

On Thu,  7 Feb 2008 10:18:59 +0100 Jens Axboe <jens.axboe@...cle.com> wrote:

> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
> ---
>  include/linux/workqueue.h |    1 +
>  kernel/workqueue.c        |   15 +++++++++++++++
>  2 files changed, 16 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
> index 7f28c32..4c46944 100644
> --- a/include/linux/workqueue.h
> +++ b/include/linux/workqueue.h
> @@ -179,6 +179,7 @@ __create_workqueue_key(const char *name, int singlethread,
>  extern void destroy_workqueue(struct workqueue_struct *wq);
>  
>  extern int FASTCALL(queue_work(struct workqueue_struct *wq, struct work_struct *work));
> +extern int FASTCALL(queue_work_on_cpu(struct workqueue_struct *wq, struct work_struct *work, int cpu));

-ETOOWIDE

please don't add fastcall - we're trying to remove it.

>  extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq,
>  			struct delayed_work *work, unsigned long delay));
>  extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 52db48e..551ad7e 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -175,6 +175,21 @@ int fastcall queue_work(struct workqueue_struct *wq, struct work_struct *work)
>  }
>  EXPORT_SYMBOL_GPL(queue_work);
>  
> +int fastcall queue_work_on_cpu(struct workqueue_struct *wq,
> +			       struct work_struct *work, int cpu)
> +{
> +	int ret = 0;
> +
> +	if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
> +		BUG_ON(!list_empty(&work->entry));
> +		__queue_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
> +		ret = 1;
> +	}
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(queue_work_on_cpu);

Might as well change queue_work() to call this?

Oleg cc'ed as queue_work() maintainer ;)
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