linux-kernel - Re: [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3)

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Message-Id: <20090414.202359.07968871.davem@davemloft.net>
Date:	Tue, 14 Apr 2009 20:23:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	dada1@...mosbay.com, jeff.chua.linux@...il.com, kaber@...sh.net,
	paulmck@...ux.vnet.ibm.com, paulus@...ba.org, mingo@...e.hu,
	torvalds@...ux-foundation.org, laijs@...fujitsu.com,
	jengelh@...ozas.de, r000n@...0n.net, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3)

From: Stephen Hemminger <shemminger@...tta.com>
Date: Tue, 14 Apr 2009 14:13:51 -0700

> This is an alternative version of ip/ip6/arp tables locking using
> per-cpu locks.  This avoids the overhead of synchronize_net() during
> update but still removes the expensive rwlock in earlier versions.
> 
> The idea for this came from an earlier version done by Eric Dumazet.
> Locking is done per-cpu, the fast path locks on the current cpu
> and updates counters.  The slow case involves acquiring the locks on
> all cpu's.
> 
> The mutex that was added for 2.6.30 in xt_table is unnecessary since
> there already is a mutex for xt[af].mutex that is held.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

Things seem to be winding down, good. :-)

I'll let Patrick McHardy merge this to me with his other pending
netfilter fixes.

Thanks!
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