netdev - Re: [PATCH 1/2] rhashtable: Introduce rhashtable_walk

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Message-ID: <20150127203924.GB9061@gondor.apana.org.au>
Date:	Wed, 28 Jan 2015 07:39:24 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	David Miller <davem@...emloft.net>, David.Laight@...LAB.COM,
	ying.xue@...driver.com, kaber@...sh.net,
	paulmck@...ux.vnet.ibm.com, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 1/2] rhashtable: Introduce rhashtable_walk_*

On Tue, Jan 27, 2015 at 11:40:28AM +0000, Thomas Graf wrote:
> 
> This is unrelated to resize run control though, the reason is that
> I'm converting tcp_hashinfo et al and they require a hybrid approach.
> The tables may be too big to construct a parallel data structure, we
> don't want to hold off inserts or deletes while the expensive dump
> is underway. Even though we can't build a shadow structure while
> locking everybody else out, we still want to provide a way to somehow
> achieve consistent information. I think that NLM_F_INTR with fallback
> to restarting the dump is a good option and very easy to implement. In
> that case, we want to lock out resize from dumping iterations but
> still allow parallel insert/delete.

Well I guess Dave needs to make the call.  Do we want to allow
lockless walks over the hash table or not?

Personally I don't think a linked list is that big a deal.  But then
you guys were agonsing over a single pointer so who knows.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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