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

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Date:	Sun, 22 Mar 2015 13:06:30 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Herbert Xu <herbert@...dor.apana.org.au>
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 03/22/15 at 12:17pm, Thomas Graf wrote:
> On 03/22/15 at 07:04pm, Herbert Xu wrote:
> > +	struct bucket_table *new_tbl;
> > +	struct bucket_table *tbl;
> > +	int err;
> >  
> > -	ASSERT_RHT_MUTEX(ht);
> > +	if (size < ht->p.min_size)
> > +		size = ht->p.min_size;
> 
> We should only shrink if size < old_tbl->size

I found the check further down. Any particular reason why check
after allocation and then free again? Why do you want to avoid
the allocation inside the mutex?

> > -	new_tbl = bucket_table_alloc(ht, old_tbl->size / 2);
> > +	new_tbl = bucket_table_alloc(ht, size);
> >  	if (new_tbl == NULL)
> >  		return -ENOMEM;
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