netdev - Re: [v2 PATCH] rhashtable: Still do rehash when we get EEXIST

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Date:   Wed, 23 Jan 2019 19:40:01 -0800
From:   Josh Elsasser <jelsasser@...neta.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Thomas Graf <tgraf@...g.ch>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH] rhashtable: Still do rehash when we get EEXIST

On Jan 23, 2019, at 7:08 PM, Herbert Xu <herbert@...dor.apana.org.au> wrote:

> Thanks for catching this!
> 
> Although I think we should fix this in a different way.  The problem
> here is that the shrink cannot proceed because there was a previous
> rehash that is still incomplete.  We should wait for its completion
> and then reattempt a shrinnk should it still be necessary.
> 
> So something like this:

SGTM. 

I can't test this right now because our VM server's down after a power
 outage this evening, but I tried a similar patch that swallowed the
 -EEXIST err and even with that oversight the hashtable dodged the
reschedule loop.

- Josh