linux-kernel - Re: [PATCH 1/2 tj/for-3.10] workqueue: add wq->freezing and remove POOL

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Date:	Mon, 1 Apr 2013 11:44:02 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2 tj/for-3.10] workqueue: add wq->freezing and remove
 POOL_FREEZING

On Sun, Mar 31, 2013 at 12:29:14AM +0800, Lai Jiangshan wrote:
> freezing is nothing related to pools, but POOL_FREEZING adds a connection,
> and causes freeze_workqueues_begin() and thaw_workqueues() complicated.
> 
> Since freezing is workqueue instance attribute, so we introduce wq->freezing
> instead and remove POOL_FREEZING.
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
>  kernel/workqueue.c |   33 +++++++--------------------------
>  1 files changed, 7 insertions(+), 26 deletions(-)
> 
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 04a8b98..6b7e5a4 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -66,7 +66,6 @@ enum {
>  	 */
>  	POOL_MANAGE_WORKERS	= 1 << 0,	/* need to manage workers */
>  	POOL_DISASSOCIATED	= 1 << 2,	/* cpu can't serve workers */
> -	POOL_FREEZING		= 1 << 3,	/* freeze in progress */
>  
>  	/* worker flags */
>  	WORKER_STARTED		= 1 << 0,	/* started */
> @@ -241,6 +240,7 @@ struct workqueue_struct {
>  
>  	int			nr_drainers;	/* WQ: drain in progress */
>  	int			saved_max_active; /* WQ: saved pwq max_active */
> +	bool			freezing;	/* WQ: the wq is freezing */

Why not use another internal flag?  There already are __WQ_DRAINING
and __WQ_ORDERED.  Can't we just add __WQ_FREEZING?

Thanks.

-- 
tejun
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