netdev - Re: [Patch net-next 6/7] net_sched: cls: move allocation in ->init to generic layer

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Date:	Tue, 14 Jan 2014 10:56:02 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next 6/7] net_sched: cls: move allocation in ->init to
 generic layer

On Sun, Jan 12, 2014 at 5:07 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> On 01/09/14 19:14, Cong Wang wrote:
>>
>> Most of the filters need allocation of tp->root in ->init()
>> and free it in ->destroy(), make this generic.
>>
>> Also we could reduce the use of tcf_tree_lock a bit.
>>
>> Cc: Thomas Graf <tgraf@...g.ch>
>> Cc: David S. Miller <davem@...emloft.net>
>> Cc: Jamal Hadi Salim <jhs@...atatu.com>
>> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>
>
>
> Hrm. This one worries me a little.
> I dont see how just pre-allocing the private head of the classifier
> magically allows you to get rid of locks. Have you tested against those
> classifiers you changed?
> If those locks are useless - then that is a separate patch to kill
> them (sorry, dont have time to test myself right now).


Yeah, I am not sure either. I will re-think about this locking stuff.
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