netdev - Re: [PATCH net-next v5] lib/rhashtable: allow user to set the minimum shifts of shrinking

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Date:	Wed, 03 Sep 2014 20:57:03 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ying.xue@...driver.com
Cc:	tgraf@...g.ch, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v5] lib/rhashtable: allow user to set the
 minimum shifts of shrinking

From: Ying Xue <ying.xue@...driver.com>
Date: Wed, 3 Sep 2014 09:22:36 +0800

> Although rhashtable library allows user to specify a quiet big size
> for user's created hash table, the table may be shrunk to a
> very small size - HASH_MIN_SIZE(4) after object is removed from
> the table at the first time. Subsequently, even if the total amount
> of objects saved in the table is quite lower than user's initial
> setting in a long time, the hash table size is still dynamically
> adjusted by rhashtable_shrink() or rhashtable_expand() each time
> object is inserted or removed from the table. However, as
> synchronize_rcu() has to be called when table is shrunk or
> expanded by the two functions, we should permit user to set the
> minimum table size through configuring the minimum number of shifts
> according to user specific requirement, avoiding these expensive
> actions of shrinking or expanding because of calling synchronize_rcu().
> 
> Signed-off-by: Ying Xue <ying.xue@...driver.com>

Applied, thank you.
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