netdev - Re: [PATCH 3/3] netlink: Lock out table resizes while dumping Netlink sockets

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Date:	Thu, 22 Jan 2015 09:05:18 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Patrick McHardy <kaber@...sh.net>, davem@...emloft.net,
	paulmck@...ux.vnet.ibm.com, ying.xue@...driver.com,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH 3/3] netlink: Lock out table resizes while dumping
 Netlink sockets

On 01/22/15 at 06:20pm, Herbert Xu wrote:
> On Thu, Jan 22, 2015 at 05:35:01PM +1100, Herbert Xu wrote:
> > On Wed, Jan 21, 2015 at 10:23:46AM +0000, Thomas Graf wrote:
> > >
> > > The usage will be identical to how __inet_lookup_listener() uses it.
> > > If at the end of the lookup, we ended up in a different table than
> > > we started, the lookup is restarted as an entry has moved to another
> > > table while we were moving over it.
> > 
> > Who uses this stuff apart from ip_dynaddr?
> 
> OK it's there for fast socket recycling.  Given that and the fact
> that everyone seems to be happy with restarting the dump after a
> resize, I think we should just go with that.
> 
> Anybody who wants a better walk can always implement their own
> data structure outside of rhashtable.

What did you think of the idea to let the user store the walker
bit for rhashtable?
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