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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20081008024813.GC6499@wotan.suse.de>
Date:	Wed, 8 Oct 2008 04:48:13 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-netdev@...r.kernel.org, paulmck@...ibm.com
Subject: Re: [patch][rfc] ddds: "dynamic dynamic data structure" algorithm, for adaptive dcache hash table sizing

On Tue, Oct 07, 2008 at 02:08:25PM -0700, David Miller wrote:
> From: Nick Piggin <npiggin@...e.de>
> Date: Tue, 7 Oct 2008 08:48:34 +0200
> 
> > I'm cc'ing netdev because Dave did express some interest in using this for
> > some networking hashes, and network guys in general are pretty cluey when it
> > comes to hashes and such ;)
> 
> Interesting stuff.
> 
> Paul, many months ago, forwarded to me a some work done by Josh
> Triplett called "rcuhashbash" which had similar objectives.  He did
> post it to linux-kernel, and perhaps even your ideas are inspired by
> his work, I don't know. :-)

Hmm yes I did see that. It's not too similar, as it focuses on re-keying
an existing element into the same hash table. ddds can't do that kind of
thing (the underlying data structure isn't visible to the algorithm, so
it can't exactly modify data structures in-place), although in another
sense it is more general because the transfer function could transfer
items into another hash table and re-key them as it goes (if it did that,
it could probably use Josh's "atomic" re-keying algorithm too).

But largely it does seem like they are orthogonal (if I'm reading
rcuhashbash correctly).

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/