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

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

             reply	other threads:[~2011-03-17 14:23 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-17 14:23 Eric Dumazet [this message]
2011-03-17 14:23 ` Poll about irqsafe_cpu_add and others Eric Dumazet
2011-03-17 14:40 ` Christoph Lameter
2011-03-17 15:14 ` David Miller
2011-03-17 15:14   ` David Miller
2011-03-17 15:18   ` Christoph Lameter
2011-03-17 15:18     ` Christoph Lameter
2011-03-17 16:53     ` Eric Dumazet
2011-03-17 17:46       ` Christoph Lameter
2011-03-17 18:29         ` Eric Dumazet
2011-03-17 18:29           ` Eric Dumazet
2011-03-17 18:42           ` Christoph Lameter
2011-03-17 18:42             ` Christoph Lameter
2011-03-17 18:55             ` Eric Dumazet
2011-03-17 19:21               ` Christoph Lameter
2011-03-18  6:56 ` Benjamin Herrenschmidt

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