linux-kernel - Re: [PATCH 24/32] dlm: dlm workqueues aren't used in memory reclaim path

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Date:	Mon, 03 Jan 2011 13:58:27 +0000
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Christine Caulfield <ccaulfie@...hat.com>,
	David Teigland <teigland@...hat.com>, cluster-devel@...hat.com
Subject: Re: [PATCH 24/32] dlm: dlm workqueues aren't used in memory
 reclaim path

Hi,

You already acked a patch to do this, which is in the DLM git tree,
waiting for the next merge window:

http://git.kernel.org/?p=linux/kernel/git/teigland/dlm.git;a=commitdiff;h=dcce240ead802d42b1e45ad2fcb2ed4a399cb255

Steve.

On Mon, 2011-01-03 at 14:49 +0100, Tejun Heo wrote:
> dlm isn't depended upon during memory reclaim and so are its two
> workqueues.  Convert to alloc[_ordered]_workqueue() without
> WQ_MEM_RECLAIM.  While at it, fix workqueue allocation failure
> handling.  They return %NULL on failure not ERR_PTR() value.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Christine Caulfield <ccaulfie@...hat.com>
> Cc: David Teigland <teigland@...hat.com>
> Cc: cluster-devel@...hat.com
> ---
> Only compile tested.  Please feel free to take it into the subsystem
> tree or simply ack - I'll route it through the wq tree.
> 
> Thanks.
> 
>  fs/dlm/lowcomms.c |   19 ++++++++-----------
>  1 files changed, 8 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
> index 37a34c2..9aad7c0 100644
> --- a/fs/dlm/lowcomms.c
> +++ b/fs/dlm/lowcomms.c
> @@ -1430,20 +1430,17 @@ static void work_stop(void)
>  
>  static int work_start(void)
>  {
> -	int error;
> -	recv_workqueue = create_workqueue("dlm_recv");
> -	error = IS_ERR(recv_workqueue);
> -	if (error) {
> -		log_print("can't start dlm_recv %d", error);
> -		return error;
> +	recv_workqueue = alloc_workqueue("dlm_recv", 0, 1);
> +	if (!recv_workqueue) {
> +		log_print("can't start dlm_recv");
> +		return -ENOMEM;
>  	}
>  
> -	send_workqueue = create_singlethread_workqueue("dlm_send");
> -	error = IS_ERR(send_workqueue);
> -	if (error) {
> -		log_print("can't start dlm_send %d", error);
> +	send_workqueue = alloc_ordered_workqueue("dlm_send", 0);
> +	if (!send_workqueue) {
> +		log_print("can't start dlm_send");
>  		destroy_workqueue(recv_workqueue);
> -		return error;
> +		return -ENOMEM;
>  	}
>  
>  	return 0;


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