From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: laijs@cn.fujitsu.com, mingo@elte.hu, paulmck@linux.vnet.ibm.com,
cl@linux-foundation.org, penberg@kernel.org, mpm@selenic.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH 4/4] net,rcu: don't assume the size of struct rcu_head
Date: Tue, 01 Mar 2011 09:20:55 +0100 [thread overview]
Message-ID: <1298967655.2676.66.camel@edumazet-laptop> (raw)
In-Reply-To: <20110301.001638.104075130.davem@davemloft.net>
Le mardi 01 mars 2011 A 00:16 -0800, David Miller a A(C)crit :
> From: Lai Jiangshan <laijs@cn.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@cn.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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next prev parent reply other threads:[~2011-03-01 8:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-01 8:03 Lai Jiangshan
2011-03-01 8:16 ` David Miller
2011-03-01 8:20 ` Eric Dumazet [this message]
2011-03-01 8:53 ` [PATCH 4/4 V2] " Lai Jiangshan
2011-03-01 9:20 ` Eric Dumazet
2011-03-02 2:46 ` Lai Jiangshan
2011-03-02 3:02 ` Eric Dumazet
2011-03-01 8:20 ` [PATCH 4/4] " Eric Dumazet
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