netdev - Re: [PATCH net-next 0/5] bonding: patchset for rcu use in bonding

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Message-ID: <20131021091336.GB692@redhat.com>
Date:	Mon, 21 Oct 2013 11:13:36 +0200
From:	Veaceslav Falico <vfalico@...hat.com>
To:	Ding Tianhong <dingtianhong@...wei.com>
Cc:	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	"David S. Miller" <davem@...emloft.net>,
	Nikolay Aleksandrov <nikolay@...hat.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/5] bonding: patchset for rcu use in bonding

On Mon, Oct 21, 2013 at 04:58:36PM +0800, Ding Tianhong wrote:
>Hi:
>
>The Patch Set will remove the invalid lock for bond work queue and replace it
>with rtnl lock, as read lock for bond could not protect slave list any more.

rtnl lock is a lot more expensive than bond lock, and not only for bond,
but for all the networking stack.

Why is the bond->lock invalid? It correctly protects slaves from being
modified concurrently.

I don't see the point in this patchset.

>
>Ding Tianhong (5):
>  bonding: remove bond read lock for bond_mii_monitor()
>  bonding: remove bond read lock for bond_alb_monitor()
>  bonding: remove bond read lock for bond_loadbalance_arp_mon()
>  bonding: remove bond read lock for bond_activebackup_arp_mon()
>  bonding: remove bond read lock for bond_3ad_state_machine_handler()
>
> drivers/net/bonding/bond_3ad.c  |   9 ++--
> drivers/net/bonding/bond_alb.c  |  20 ++------
> drivers/net/bonding/bond_main.c | 100 +++++++++++++---------------------------
> 3 files changed, 40 insertions(+), 89 deletions(-)
>
>-- 
>1.8.2.1
>
>
>
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