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From: William Lee Irwin III <wli@holomorphy.com>
To: Nick Piggin <npiggin@suse.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [rfc][patch] dynamic resizing dentry hash using RCU
Date: Sat, 24 Feb 2007 14:56:31 -0800	[thread overview]
Message-ID: <20070224225631.GA9222@holomorphy.com> (raw)
In-Reply-To: <20070224050937.GA16601@wotan.suse.de>

On Fri, Feb 23, 2007 at 08:24:44PM -0800, William Lee Irwin III wrote:
>> You would be better served by a data structure different from a hashtable.

On Sat, Feb 24, 2007 at 06:09:37AM +0100, Nick Piggin wrote:
> Out of curiosity, what better data structure do you have in mind for
> the dentry hash?

Per-directory indices of ->d_subdirs. Hash tries (spelled correctly)
and B+ trees hung off dentries corresponding to directories are
plausible. There are plenty of other possibilities; just do it on a
per-directory basis so you don't intermix children of different parents
in some boot-time -allocated global trainwreck and you're home free.
Benchmarking is probably needed to gauge which performs best.


-- wli

  reply	other threads:[~2007-02-24 22:56 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-23 15:37 Nick Piggin
2007-02-23 16:31 ` Eric Dumazet
2007-02-24  1:08   ` Nick Piggin
2007-02-23 17:25 ` Zach Brown
2007-02-24  1:26   ` Nick Piggin
2007-02-24  2:07     ` Nick Piggin
2007-02-24  1:31   ` Michael K. Edwards
2007-02-24  1:52     ` Nick Piggin
2007-02-24  4:07 ` KAMEZAWA Hiroyuki
2007-02-24  5:15   ` Nick Piggin
2007-02-24  4:24 ` William Lee Irwin III
2007-02-24  5:09   ` Nick Piggin
2007-02-24 22:56     ` William Lee Irwin III [this message]
2007-02-25  0:56       ` David Miller
2007-02-25  2:15         ` William Lee Irwin III
2007-02-25  6:21 ` Paul E. McKenney
2007-03-05  4:11 ` David Miller
2007-03-05  4:27   ` Nick Piggin
2007-03-05  4:38     ` David Miller
2007-03-05  4:42     ` Nick Piggin

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