netdev - Re: [v2 PATCH 7/10] rhashtable: Disable automatic shrinking

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Message-ID: <20150323092806.GA12506@gondor.apana.org.au>
Date:	Mon, 23 Mar 2015 20:28:07 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Patrick McHardy <kaber@...sh.net>,
	Josh Triplett <josh@...htriplett.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org
Subject: Re: [v2 PATCH 7/10] rhashtable: Disable automatic shrinking

On Mon, Mar 23, 2015 at 08:33:19AM +0000, Thomas Graf wrote:
>
> I'm not claiming you always want shrinking but what gain is there by
> removing integrated support? Can you show numbers that the additional
> branch actually hurts?

You never want automatic shrinking unless all your users are
trusted.  I doubt there would be many rhashtable users where
this would apply.  Even nft_hash is quite tenuous.

Besdies, if you really want automatic shrinking, you could always
do it in the caller of rhashtable_remove.  That way only you
would pay for the cost and not everybody else.

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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