netdev - RE: [PATCH 03/12] netfilter: x_tables: align per cpu xt

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CB54634@AcuExch.aculab.com>
Date:	Mon, 22 Jun 2015 11:49:02 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Pablo Neira Ayuso' <pablo@...filter.org>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 03/12] netfilter: x_tables: align per cpu xt_counter

From: Pablo Neira Ayuso
> Sent: 19 June 2015 18:18
> From: Eric Dumazet <edumazet@...gle.com>
> 
> Let's force a 16 bytes alignment on xt_counter percpu allocations,
> so that bytes and packets sit in same cache line.
> 
> xt_counter being exported to user space, we cannot add __align(16) on
> the structure itself.

You could allocate a wrapper structure that contains xt_counter
and is itself marked __align(16).

	David

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