linux-kernel - Re: [PATCH] UDPCP Communication Protocol

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Message-ID: <1293791353.5193.1.camel@wall-e>
Date:	Fri, 31 Dec 2010 11:29:13 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] UDPCP Communication Protocol

Am Freitag, den 31.12.2010, 11:15 +0100 schrieb Eric Dumazet:
> Le vendredi 31 décembre 2010 à 10:29 +0100, stefani@...bold.net a
> écrit :
> > +				spin_lock_irqsave(&spinlock, flags);
> > +				udpcp_stat.txMsgs++;
> > +				spin_unlock_irqrestore(&spinlock, flags);
> 
> This is really ugly for different reasons :
> 
> 1) Naming a lock, even static "spinlock" is ugly.

Agree...

> 2) Using a lock for stats is not necessary, and
>    disabling hard irqs is not necessary either (spinlock_bh() would be
> more than enough)
>   
>    At a very minimum, you should use atomic_t so that no lock is needed
> 
> 3) Network stack widely use MIB per_cpu counters.
>  As you use UDP, you could take a look at UDP_INC_STATS_BH()/
> UDP_INC_STATS_USER() implementation for an example.
> 

I will have look at this and revamp it.


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