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Date:	Mon, 17 Nov 2014 12:46:58 +0800
From:	Herbert Xu <>
To:	Josh Triplett <>
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 <> wrote:
> >Josh Triplett <> 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.

Email: Herbert Xu <>
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