linux-kernel - Re: [PATCH 4/4] net,rcu: don't assume the size of struct rcu

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Message-ID: <1298967655.2676.66.camel@edumazet-laptop>
Date:	Tue, 01 Mar 2011 09:20:55 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	laijs@...fujitsu.com, mingo@...e.hu, paulmck@...ux.vnet.ibm.com,
	cl@...ux-foundation.org, penberg@...nel.org, mpm@...enic.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] net,rcu: don't assume the size of struct rcu_head

Le mardi 01 mars 2011 à 00:16 -0800, David Miller a écrit :
> From: Lai Jiangshan <laijs@...fujitsu.com>
> Date: Tue, 01 Mar 2011 16:03:44 +0800
> 
> > 
> > struct dst_entry assumes the size of struct rcu_head as 2 * sizeof(long)
> > and manually adds pads for aligning for "__refcnt".
> > 
> > When the size of struct rcu_head is changed, these manual padding
> > is wrong. Use __attribute__((aligned (64))) instead.
> > 
> > Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> 
> We don't want to use the align if it's going to waste lots of space.
> 
> Instead we want to rearrange the structure so that the alignment comes
> more cheaply.

Oh well, I should have read your answer before sending mine :)



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