linux-kernel - Re: [patch 15/28] fs: scale inode alias list

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Date:	Fri, 19 Nov 2010 11:41:50 -0800
From:	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 15/28] fs: scale inode alias list

On Tue, Nov 16, 2010 at 6:09 AM, Nick Piggin <npiggin@...nel.dk> wrote:

> @@ -290,13 +300,18 @@ void dput(struct dentry *dentry)
>                         * want to reduce dcache_lock anyway so this will
>                         * get improved.
>                         */
> +drop1:
>                        spin_unlock(&dentry->d_lock);
>                        goto repeat;
>                }
> -               if (parent && !spin_trylock(&parent->d_lock)) {
> -                       spin_unlock(&dentry->d_lock);
> +               if (!spin_trylock(&dcache_inode_lock)) {
> +drop2:
>                        spin_unlock(&dcache_lock);
> -                       goto repeat;
> +                       goto drop1;
> +               }
> +               if (parent && !spin_trylock(&parent->d_lock)) {
> +                       spin_unlock(&dcache_inode_lock);
> +                       goto drop2;
>                }
>        }
>        dentry->d_count--;

Another ugh moment.  But it gets better in patches 18 and 20.
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