netdev - Re: [PATCH net-next v2] extend taskstats API to support networking accounts

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Date:	Fri, 24 Feb 2012 03:05:10 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Li Yu <raise.sail@...il.com>
CC:	<netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next v2] extend taskstats API to support networking
 accounts

On Fri, 2012-02-24 at 10:43 +0800, Li Yu wrote:
> This patch adds L7 traffic accounting in taskstats API, so
> the iotop like applications can receive these statistics data.
> In fact, I also have an iotop patch for this change.
> 
> It ignores any protocol header overhead, so results of this
> patch should be saw as the applications-aware data statistics
> instead of traffic statistics on wire.
> 
> The changes of v2 are:
> 
> 1. Move up accounting source code, so they are not protocol-aware now.
> 2. Skipping interrupt context accounting.
[...]
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1735,6 +1735,18 @@ static inline int skb_copy_to_page(struct sock 
> *sk, char __user *from,
>   	return 0;
>   }
> 
> +static inline void task_net_accounting_rx(unsigned int len)
> +{
> +	if (!in_irq() && len > 0)
> +		current->rx_bytes += len;
> +}
> +
> +static inline void task_net_accounting_tx(unsigned int len)
> +{
> +	if (!in_irq() && len > 0)
> +		current->tx_bytes += len;
> +}
[...]

These are only called from system calls, so why are you checking for IRQ
context?

> @@ -558,7 +559,10 @@ static inline int __sock_sendmsg_nosec(struct kiocb 
> *iocb, struct socket *sock,
>   	si->msg = msg;
>   	si->size = size;
> 
> -	return sock->ops->sendmsg(iocb, sock, msg, size);
> +	ret = sock->ops->sendmsg(iocb, sock, msg, size);
> +	task_net_accounting_tx(ret);
> +
> +	return ret;
>   }
[...]

So what happens to the totals when sendmsg() returns an error?

It seems to me that the parameter type for the accounting functions
should be ssize_t.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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