linux-kernel - Re: [rfc][patch] dynamic resizing dentry hash using RCU

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Message-Id: <20070304.201142.41654149.davem@davemloft.net>
Date:	Sun, 04 Mar 2007 20:11:42 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	npiggin@...e.de
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [rfc][patch] dynamic resizing dentry hash using RCU

From: Nick Piggin <npiggin@...e.de>
Date: Fri, 23 Feb 2007 16:37:43 +0100

> So I introduce a new method for resizing hash tables with RCU, and apply
> that to the dentry hash.

Thanks for doing this work Nick.  I'm going to take your ideas
and apply them to an ipv4 routing cache dynamic growth patch I
worked on a while ago.

One minor nit:

> +struct dentry_hash {
> +	unsigned int shift;
> +	unsigned long mask;
> +	struct hlist_head *table;
> +};

I don't see any reason to make 'mask' an unsigned long
and this makes this structure take up 8 bytes more than
necessary on 64-bit.
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