netdev - Re: [PATCH net-next v2] rhashtable: involve rhashtable_lookup

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Message-ID: <20150105215237.GC31637@casper.infradead.org>
Date:	Mon, 5 Jan 2015 21:52:37 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	David Miller <davem@...emloft.net>
Cc:	ying.xue@...driver.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2] rhashtable: involve rhashtable_lookup_insert
 routine

On 01/05/15 at 04:30pm, David Miller wrote:
> From: Thomas Graf <tgraf@...g.ch>
> Date: Mon, 5 Jan 2015 13:05:14 +0000
> 
> > On 01/05/15 at 07:33pm, Ying Xue wrote:
> >> Involve a new function called rhashtable_lookup_insert() which makes
> >> lookup and insertion atomic under bucket lock protection, helping us
> >> avoid to introduce an extra lock when we search and insert an object
> >> into hash table.
> >> 
> >> Signed-off-by: Ying Xue <ying.xue@...driver.com>
> >> Signed-off-by: Thomas Graf <tgraf@...g.ch>
> > 
> > Thanks for putting this around so quickly and thanks for testing.
> > I think this looks good. You might be able to factor out some code
> > from rhashtable_insert() to avoid duplication so we reduce the risk
> > of fixing a bug for one function but not the other.
> 
> Do you want Ying to do this factoring out now in a v3 of this patch
> or in a subsequent patch?
> 
> I assume the former since you didn't give your ACK.

Ying,

I prefer it now if you don't mind. Basically I would like to see the
grow decision factored out at least:

        /* Only grow the table if no resizing is currently in progress. */
        if (ht->tbl != ht->future_tbl &&
            ht->p.grow_decision && ht->p.grow_decision(ht, tbl->size))
                schedule_delayed_work(&ht->run_work, 0);
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