netdev - Re: [PATCH 4/4] rhashtable: Add parent argument to mutex_is

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Date:	Mon, 17 Nov 2014 12:46:58 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	tgraf@...g.ch, netdev@...r.kernel.org, eric.dumazet@...il.com,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH 4/4] rhashtable: Add parent argument to mutex_is_held

On Sat, Nov 15, 2014 at 06:37:26PM -0800, Josh Triplett wrote:
> On November 15, 2014 6:22:27 PM PST, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> >Josh Triplett <josh@...htriplett.org> wrote:
> >>
> >> - Set up the new empty table with the new set of hash parameters.
> >> - synchronize_rcu().  Readers will now search both old and new
> >tables.
> >> - Peel nodes off the ends of the old hash table and add them to the
> >new
> >
> >We currently use a singly linked list in rhashtable.  Peeling nodes
> >off the end would mean upgrading to a doubly linked list, which is
> >no different than keeping two lists in terms of cache footprint, no?
> 
> No, since each pass just handles one set of nodes from each bucket anyway, you can just do a bit more work in the rehasher instead.

OK let me see if I could implement something like that in rhashtable.

Thanks,
-- 
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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