linux-kernel - Re: dirty balancing deadlock

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Date:	Mon, 19 Feb 2007 01:30:28 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	akpm@...ux-foundation.org
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: dirty balancing deadlock

> --- a/fs/fs-writeback.c~a
> +++ a/fs/fs-writeback.c
> @@ -356,7 +356,7 @@ int generic_sync_sb_inodes(struct super_
>  			continue;		/* Skip a congested blockdev */
>  		}
>  
> -		if (wbc->bdi && bdi != wbc->bdi) {
> +		if (wbc->bdi && bdi != wbc->bdi && bdi_write_congested(bdi)) {
>  			if (!sb_is_blkdev_sb(sb))
>  				break;		/* fs has the wrong queue */
>  			list_move(&inode->i_list, &sb->s_dirty);

Checking bdi_write_congested(bdi) is not reliable, since the queue can
become congested _after_ the check is done.

Miklos
-
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