netdev - Re: [PATCH 7/9] rhashtable: Per bucket locks & deferred expansion/shrinking

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Message-ID: <20150116163826.GD15052@casper.infradead.org>
Date:	Fri, 16 Jan 2015 16:38:26 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	kernel@...r.kernel.org, herbert@...dor.apana.org.au,
	paulmck@...ux.vnet.ibm.com, edumazet@...gle.com,
	john.r.fastabend@...el.com, josh@...htriplett.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 7/9] rhashtable: Per bucket locks & deferred
 expansion/shrinking

On 01/16/15 at 04:32pm, Patrick McHardy wrote:
> If we have to block, the dumper if of course preferred. Taking the
> mutex should do fine I guess?

That will work, it will also ensure that the walker doesn't see the
pre unzip state which would cause entries to be duplicated in the
walker.

> I suppose walking both tables without any races would be rather
> complicated.

Very interested if you can come up with something ;-)
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