linux-kernel - Re: [PATCH] Drivers: hv: connection: Remove create

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Message-ID: <20160620150957.GX3262@mtj.duckdns.org>
Date:	Mon, 20 Jun 2016 11:09:57 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Drivers: hv: connection: Remove create_workqueue

Hello,

On Sat, Jun 18, 2016 at 02:14:23PM +0530, Bhaktipriya Shridhar wrote:
> alloc_workqueue replaces deprecated create_workqueue().
> A dedicated workqueue has been used since the workitem (viz &ctx->work,
> which maps to vmbus_onmessage_work), is engaged in normal device
> operation which involves invoking the handler for channel protocol
> messages. WQ_MEM_RECLAIM has been set to guarantee forward progress under
> memory pressure, which is a requirement in this case.
> Since there are only a fixed number of work items, explicit concurrency
> limit is unnecessary here.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>
> ---
>  drivers/hv/connection.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
> index fcf8a02..a292b85 100644
> --- a/drivers/hv/connection.c
> +++ b/drivers/hv/connection.c
> @@ -147,7 +147,8 @@ int vmbus_connect(void)
> 
>  	/* Initialize the vmbus connection */
>  	vmbus_connection.conn_state = CONNECTING;
> -	vmbus_connection.work_queue = create_workqueue("hv_vmbus_con");
> +	vmbus_connection.work_queue = alloc_workqueue("hv_vmbus_con",
> +						      WQ_MEM_RECLAIM, 0);

This is part of a hypervisor, right?  I'm not sure why this would need
WQ_MEM_RECLAIM.  It doesn't play any role during memory reclaim,
right?

Thanks.

-- 
tejun