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Date: Wed, 21 Jan 2015 16:23:33 +1100 From: Herbert Xu <herbert@...dor.apana.org.au> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: Pablo Neira Ayuso <pablo@...filter.org>, Patrick McHardy <kaber@...sh.net>, Thomas Graf <tgraf@...g.ch>, David Laight <David.Laight@...LAB.COM>, "davem@...emloft.net" <davem@...emloft.net>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "edumazet@...gle.com" <edumazet@...gle.com>, "john.r.fastabend@...el.com" <john.r.fastabend@...el.com>, "josh@...htriplett.org" <josh@...htriplett.org>, "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org> Subject: Re: [PATCH 7/9] rhashtable: Per bucket locks & deferred expansion/shrinking On Mon, Jan 19, 2015 at 01:01:21AM -0800, Paul E. McKenney wrote: > > One unconventional way of handling this is to associate the scan with > a one-to-one resize operation. This can be implemented to have the > effect of taking a snapshot of the table. The problem is that in general (not for netfilter, but certainly other rhashtable users such as netlink) dumps/walks can be started by ordinary users and I don't think we can afford creating a snapshot for each one, or can we? 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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