netdev - Re: [PATCH][net-next] openvswitch: change the data type of error status to atomic_long

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Message-ID: <CAHA+R7PhH+oiKuxeYGJxVS3qP-qe_GEV4qSz0b+Gj-JpTcPGJw@mail.gmail.com>
Date:	Mon, 8 Sep 2014 15:21:52 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Li RongQing <roy.qing.li@...il.com>
Cc:	Pravin Shelar <pshelar@...ira.com>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH][net-next] openvswitch: change the data type of error
 status to atomic_long_t

On Sun, Sep 7, 2014 at 2:24 AM, Li RongQing <roy.qing.li@...il.com> wrote:
> On Sun, Sep 7, 2014 at 11:44 AM, Pravin Shelar <pshelar@...ira.com> wrote:
>>> The operation of atomic maybe faster than spin lock.
>>
>> What is reason for this change?
>
> 1.  The operation of atomic maybe faster than spin lock
> 2.  I did not find that tx_dropped/tx_error/.. is protected by spin
> lock under net dir,
> sometime tx_dropped is atomic_long_t; sometime it is percpu variable;
> sometime it is
> u64,but does not need to protect.

I didn't dig the history of the code, why not use u64_stats_sync though?
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