linux-kernel - Re: [patch][rfc] ddds: "dynamic dynamic data structure" algorithm, for adaptive dcache hash table sizing (resend)

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Message-Id: <20081007.140645.119998645.davem@davemloft.net>
Date:	Tue, 07 Oct 2008 14:06:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	npiggin@...e.de
Cc:	hch@...radead.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, netdev@...r.kernel.org, paulmck@...ibm.com
Subject: Re: [patch][rfc] ddds: "dynamic dynamic data structure" algorithm,
 for adaptive dcache hash table sizing (resend)

From: Nick Piggin <npiggin@...e.de>
Date: Tue, 7 Oct 2008 09:53:09 +0200

> Dcache lookup is partially a tree lookup, but also how do you look up
> entries in a given directory? That is not naturally a tree lookup. Could
> be a per directory tree, though, or a hash, or trie.
> 
> Anyway, I don't volunteer to change that just yet ;)

Historically speaking, the original dcache by Thomas Schoebel-Theuer
(circa 1997) was in fact implemented as a per-directory hash table.

This has all kinds of recursion and other issues, which is why Linus
eventually changed it to use a global hash table scheme.
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