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SubjectRe: [PATCH] sync_sb_inodes sync hang
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Hugh,

I tried the while loop below on a UP without PREEMPT and it has
not hung running 2.6.3-mm3 without your patch.

How long does it take to hang?
Which file system?

Thanks,
Daniel

On Tue, 2004-02-24 at 08:52, Hugh Dickins wrote:
> 2.6.3-mm UP without PREEMPT easily hangs looping around pdflush's
> sync_sb_inodes, failing the down_read_trylock in do_writepages,
> but giving the concurrent sync no chance to complete: just try
> while : ; do echo $SECONDS; sync; cp /etc/termcap .; done
>
> I think sync_sb_inodes is the only loop vulnerable to that
> change in do_writepages, so site the cond_resched() here.
>
> Hugh
>
> --- 2.6.3-mm3/fs/fs-writeback.c 2004-02-23 12:51:49.000000000 +0000
> +++ linux/fs/fs-writeback.c 2004-02-24 16:14:49.000000000 +0000
> @@ -326,6 +326,7 @@ sync_sb_inodes(struct super_block *sb, s
> writeback_release(bdi);
> spin_unlock(&inode_lock);
> iput(inode);
> + cond_resched();
> spin_lock(&inode_lock);
> if (wbc->nr_to_write <= 0)
> break;
>
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