Re: [PATCH 1/2] xfs: make global xfsalloc workqueue per-mount

[Brian Foster <bfoster@redhat.com>]

On Fri, Jan 09, 2015 at 12:10:45PM -0600, Eric Sandeen wrote:
> The xfsalloc workquaue is the last remaining global work
> queue, something we've been moving away from in general.
> Make this one per-mount like every other workqueue.
> 
> This also renames it from "xfsalloc" to "xfs-alloc" to
> match the naming convention.
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---

Looks good to me regardless of the ongoing discussion on the queue
priority:

Reviewed-by: Brian Foster <bfoster@redhat.com>

> 
> diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
> index a6fbf44..72d28d1 100644
> --- a/fs/xfs/libxfs/xfs_alloc.c
> +++ b/fs/xfs/libxfs/xfs_alloc.c
> @@ -36,8 +36,6 @@
>  #include "xfs_buf_item.h"
>  #include "xfs_log.h"
>  
> -struct workqueue_struct *xfs_alloc_wq;
> -
>  #define XFS_ABSDIFF(a,b)	(((a) <= (b)) ? ((b) - (a)) : ((a) - (b)))
>  
>  #define	XFSA_FIXUP_BNO_OK	1
> diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h
> index d1b4b6a..39933a1 100644
> --- a/fs/xfs/libxfs/xfs_alloc.h
> +++ b/fs/xfs/libxfs/xfs_alloc.h
> @@ -24,8 +24,6 @@ struct xfs_mount;
>  struct xfs_perag;
>  struct xfs_trans;
>  
> -extern struct workqueue_struct *xfs_alloc_wq;
> -
>  /*
>   * Freespace allocation types.  Argument to xfs_alloc_[v]extent.
>   */
> diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
> index 81cad43..a8a1369 100644
> --- a/fs/xfs/libxfs/xfs_btree.c
> +++ b/fs/xfs/libxfs/xfs_btree.c
> @@ -2574,7 +2574,7 @@ xfs_btree_split(
>  	args.done = &done;
>  	args.kswapd = current_is_kswapd();
>  	INIT_WORK_ONSTACK(&args.work, xfs_btree_split_worker);
> -	queue_work(xfs_alloc_wq, &args.work);
> +	queue_work(cur->bc_mp->m_alloc_workqueue, &args.work);
>  	wait_for_completion(&done);
>  	destroy_work_on_stack(&args.work);
>  	return args.result;
> diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
> index 22ccf69..7d57a5f 100644
> --- a/fs/xfs/xfs_mount.h
> +++ b/fs/xfs/xfs_mount.h
> @@ -175,6 +175,7 @@ typedef struct xfs_mount {
>  	struct workqueue_struct	*m_reclaim_workqueue;
>  	struct workqueue_struct	*m_log_workqueue;
>  	struct workqueue_struct *m_eofblocks_workqueue;
> +	struct workqueue_struct *m_alloc_workqueue;
>  } xfs_mount_t;
>  
>  /*
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 19cbda1..e5bdca9 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -873,8 +873,15 @@ xfs_init_mount_workqueues(
>  	if (!mp->m_eofblocks_workqueue)
>  		goto out_destroy_log;
>  
> +	mp->m_alloc_workqueue = alloc_workqueue("xfs-alloc/%s",
> +			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
> +	if (!mp->m_alloc_workqueue)
> +		goto out_destroy_eofblocks;
> +
>  	return 0;
>  
> +out_destroy_eofblocks:
> +	destroy_workqueue(mp->m_eofblocks_workqueue);
>  out_destroy_log:
>  	destroy_workqueue(mp->m_log_workqueue);
>  out_destroy_reclaim:
> @@ -895,6 +902,7 @@ STATIC void
>  xfs_destroy_mount_workqueues(
>  	struct xfs_mount	*mp)
>  {
> +	destroy_workqueue(mp->m_alloc_workqueue);
>  	destroy_workqueue(mp->m_eofblocks_workqueue);
>  	destroy_workqueue(mp->m_log_workqueue);
>  	destroy_workqueue(mp->m_reclaim_workqueue);
> @@ -1717,29 +1725,6 @@ xfs_destroy_zones(void)
>  }
>  
>  STATIC int __init
> -xfs_init_workqueues(void)
> -{
> -	/*
> -	 * The allocation workqueue can be used in memory reclaim situations
> -	 * (writepage path), and parallelism is only limited by the number of
> -	 * AGs in all the filesystems mounted. Hence use the default large
> -	 * max_active value for this workqueue.
> -	 */
> -	xfs_alloc_wq = alloc_workqueue("xfsalloc",
> -			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
> -	if (!xfs_alloc_wq)
> -		return -ENOMEM;
> -
> -	return 0;
> -}
> -
> -STATIC void
> -xfs_destroy_workqueues(void)
> -{
> -	destroy_workqueue(xfs_alloc_wq);
> -}
> -
> -STATIC int __init
>  init_xfs_fs(void)
>  {
>  	int			error;
> @@ -1753,13 +1738,9 @@ init_xfs_fs(void)
>  	if (error)
>  		goto out;
>  
> -	error = xfs_init_workqueues();
> -	if (error)
> -		goto out_destroy_zones;
> -
>  	error = xfs_mru_cache_init();
>  	if (error)
> -		goto out_destroy_wq;
> +		goto out_destroy_zones;
>  
>  	error = xfs_buf_init();
>  	if (error)
> @@ -1776,7 +1757,7 @@ init_xfs_fs(void)
>  	xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
>  	if (!xfs_kset) {
>  		error = -ENOMEM;
> -		goto out_sysctl_unregister;;
> +		goto out_sysctl_unregister;
>  	}
>  
>  #ifdef DEBUG
> @@ -1795,27 +1776,25 @@ init_xfs_fs(void)
>  		goto out_qm_exit;
>  	return 0;
>  
> - out_qm_exit:
> +out_qm_exit:
>  	xfs_qm_exit();
> - out_remove_kobj:
> +out_remove_kobj:
>  #ifdef DEBUG
>  	xfs_sysfs_del(&xfs_dbg_kobj);
> - out_kset_unregister:
> +out_kset_unregister:
>  #endif
>  	kset_unregister(xfs_kset);
> - out_sysctl_unregister:
> +out_sysctl_unregister:
>  	xfs_sysctl_unregister();
> - out_cleanup_procfs:
> +out_cleanup_procfs:
>  	xfs_cleanup_procfs();
> - out_buf_terminate:
> +out_buf_terminate:
>  	xfs_buf_terminate();
> - out_mru_cache_uninit:
> +out_mru_cache_uninit:
>  	xfs_mru_cache_uninit();
> - out_destroy_wq:
> -	xfs_destroy_workqueues();
> - out_destroy_zones:
> +out_destroy_zones:
>  	xfs_destroy_zones();
> - out:
> +out:
>  	return error;
>  }
>  
> @@ -1832,7 +1811,6 @@ exit_xfs_fs(void)
>  	xfs_cleanup_procfs();
>  	xfs_buf_terminate();
>  	xfs_mru_cache_uninit();
> -	xfs_destroy_workqueues();
>  	xfs_destroy_zones();
>  }
>  
> 
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