linux-kernel - Re: [PATCH 22/32] ceph: fsc->*_wq's aren't used in memory reclaim path

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Date:	Mon, 3 Jan 2011 09:58:39 -0800 (PST)
From:	Sage Weil <sage@...dream.net>
To:	Tejun Heo <tj@...nel.org>
cc:	linux-kernel@...r.kernel.org, ceph-devel@...r.kernel.org
Subject: Re: [PATCH 22/32] ceph: fsc->*_wq's aren't used in memory reclaim
 path

On Mon, 3 Jan 2011, Tejun Heo wrote:
> fsc->*_wq's aren't depended upon during memory reclaim.  Convert to
> alloc_workqueue() w/o WQ_MEM_RECLAIM.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Sage Weil <sage@...dream.net>
> Cc: ceph-devel@...r.kernel.org
> ---
> Only compile tested.  Please feel free to take it into the subsystem
> tree or simply ack - I'll route it through the wq tree.

I'll take this one through the ceph tree as well.

Thanks!
sage


> 
> Thanks.
> 
>  fs/ceph/super.c |   10 +++++++---
>  1 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ceph/super.c b/fs/ceph/super.c
> index 08b460a..1f6436e 100644
> --- a/fs/ceph/super.c
> +++ b/fs/ceph/super.c
> @@ -443,13 +443,17 @@ struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
>  		goto fail_client;
>  
>  	err = -ENOMEM;
> -	fsc->wb_wq = create_workqueue("ceph-writeback");
> +	/*
> +	 * The number of concurrent works can be high but they don't need
> +	 * to be processed in parallel, limit concurrency.
> +	 */
> +	fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
>  	if (fsc->wb_wq == NULL)
>  		goto fail_bdi;
> -	fsc->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
> +	fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
>  	if (fsc->pg_inv_wq == NULL)
>  		goto fail_wb_wq;
> -	fsc->trunc_wq = create_singlethread_workqueue("ceph-trunc");
> +	fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
>  	if (fsc->trunc_wq == NULL)
>  		goto fail_pg_inv_wq;
>  
> -- 
> 1.7.1
> 
> --
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> 
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