netdev - Re: [PATCH] ppp: add 64 bit stats

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Message-ID: <1343110954.2626.11040.camel@edumazet-glaptop>
Date:	Tue, 24 Jul 2012 08:22:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kevin Groeneveld <kgroeneveld@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ppp: add 64 bit stats

On Mon, 2012-07-23 at 21:53 -0400, Kevin Groeneveld wrote:
> On Mon, Jul 23, 2012 at 11:59 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >> Would proper synchronization in this case just be wrapping the updates
> >> in a spin_lock/spin_unlock?
> >
> > Would be fine (if the proper BH safe variant is used), or you could also
> > use atomic64_t.
> 
> Which would you recommend, spin locks or atomic64_t?
> 
> atomic64_t seems like it would be simpler.

Simpler but a bit more expensive when two counters are changed at the
same time.

(two atomic ops instead of a single one for the spinlock)


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