netdev - Poll about irqsafe_cpu

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Message-ID: <1300371834.6315.93.camel@edumazet-laptop>
Date:	Thu, 17 Mar 2011 15:23:54 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	netdev <netdev@...r.kernel.org>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Poll about irqsafe_cpu_add and others

Hi

irqsafe_cpu_{dec|inc} are used in network stack since 2.6.37 (commit
29b4433d991c88), and I would like to use irqsafe_cpu_add() in netfilter
fast path too, and SNMP counters eventually (to lower ram needs by 50%)

Initial support of irqsafe_ was given by Christoph in 2.6.34

It seems only x86 arch is using a native and efficient implementation.

Others use irqsafe_cpu_generic_to_op() and its pair of
local_irq_save() / local_irq_restore()

Which other arches could use a native implementation ?

What about defining a HAVE_FAST_IRQSAFE_ADD ?

Thanks


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