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Message-ID: <18924.59347.375292.102385@cargo.ozlabs.ibm.com>
Date: Tue, 21 Apr 2009 07:23:31 +1000
From: Paul Mackerras <paulus@samba.org>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>, paulmck@linux.vnet.ibm.com,
       Evgeniy Polyakov <zbr@ioremap.net>, David Miller <davem@davemloft.net>,
       kaber@trash.net, torvalds@linux-foundation.org,
       jeff.chua.linux@gmail.com, mingo@elte.hu, laijs@cn.fujitsu.com,
       jengelh@medozas.de, r000n@r000n.net, linux-kernel@vger.kernel.org,
       netfilter-devel@vger.kernel.org, netdev@vger.kernel.org,
       benh@kernel.crashing.org, mathieu.desnoyers@polymtl.ca
Subject: Re: [PATCH] netfilter: use per-cpu recursive lock (v10)
In-Reply-To: <49ECBE0A.7010303@cosmosbay.com>
References: <20090415170111.6e1ca264@nehalam>
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	<20090416.153354.170676392.davem@davemloft.net>
	<20090416234955.GL6924@linux.vnet.ibm.com>
	<20090417012812.GA25534@linux.vnet.ibm.com>
	<20090418094001.GA2369@ioremap.net>
	<20090418141455.GA7082@linux.vnet.ibm.com>
	<20090420103414.1b4c490f@nehalam>
	<49ECBE0A.7010303@cosmosbay.com>
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Eric Dumazet writes:

> OK, but we still have a problem on machines with >= 250 cpus,
> because calling 250 times spin_lock() is going to overflow preempt_count,
> as each spin_lock() increases preempt_count by one.

Huh?  Each cpu has its own separate preempt_count.

Paul.
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