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From: Miklos Szeredi <miklos@szeredi.hu>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: dirty balancing deadlock
Date: Mon, 19 Feb 2007 01:30:28 +0100	[thread overview]
Message-ID: <E1HIwQG-0005OS-00@dorka.pomaz.szeredi.hu> (raw)
In-Reply-To: <E1HIwLJ-0005N4-00@dorka.pomaz.szeredi.hu> (message from Miklos Szeredi on Mon, 19 Feb 2007 01:25:21 +0100)

> --- 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

  reply	other threads:[~2007-02-19  0:31 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-18 18:28 Miklos Szeredi
2007-02-18 20:53 ` Andrew Morton
2007-02-18 21:25   ` Rik van Riel
2007-02-18 22:54     ` Miklos Szeredi
2007-02-18 22:50   ` Miklos Szeredi
2007-02-18 22:59     ` Andrew Morton
2007-02-18 23:22       ` Miklos Szeredi
2007-02-18 23:59         ` Andrew Morton
2007-02-19  0:25           ` Miklos Szeredi
2007-02-19  0:30             ` Miklos Szeredi [this message]
2007-02-19  0:45             ` Miklos Szeredi
2007-02-19  0:45             ` Chris Mason
2007-02-19  0:54               ` Miklos Szeredi
2007-02-19  1:01                 ` Chris Mason
2007-02-19  1:14                   ` Miklos Szeredi
2007-02-20  0:16                     ` Chris Mason
2007-02-20  8:53                       ` Miklos Szeredi
2007-02-19 17:11           ` Miklos Szeredi
2007-02-19 23:12             ` Miklos Szeredi
2007-02-20  0:13             ` Chris Mason
2007-02-20  8:47               ` Miklos Szeredi
2007-02-20 11:30                 ` Chris Mason
2007-02-21 21:36             ` Andrew Morton
2007-02-22  7:42               ` Miklos Szeredi
2007-02-22  7:55                 ` Andrew Morton
2007-02-22  8:02                   ` Miklos Szeredi

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