[MERGE] LRUCache changes

[Martin Pool]

On Tue, Dec 9, 2008 at 9:40 AM, Martin Albisetti <argentina at gmail.com> wrote:
> On Mon, Dec 8, 2008 at 10:23 AM, John Arbash Meinel
> <john at arbash-meinel.com> wrote:
>> This patch adds a few changes to LRUCache
>
> We use this in Loggerhead to cache the revision graphs. Would this
> improve memory usage?
> Our current problem is that LH just keeps growing in memory until it
> hangs, but it may be unrelated to this.