linux-kernel - Re: [PATCH 08/12] netvm: Allow skb allocation to use PFMEMALLOC reserves

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Message-Id: <20110414.143335.104052252.davem@davemloft.net>
Date:	Thu, 14 Apr 2011 14:33:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mgorman@...e.de
Cc:	linux-mm@...ck.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl
Subject: Re: [PATCH 08/12] netvm: Allow skb allocation to use PFMEMALLOC
 reserves

From: Mel Gorman <mgorman@...e.de>
Date: Thu, 14 Apr 2011 11:41:34 +0100

> +extern int memalloc_socks;
> +static inline int sk_memalloc_socks(void)
> +{
> +	return memalloc_socks;
> +}
> +
 ...
> +static DEFINE_MUTEX(memalloc_socks_lock);
> +int memalloc_socks __read_mostly;

Please use an atomic_t, it has to be more efficient than this mutex
business.
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