netdev - Re: [PATCH] skb: Augment skb_copy_datagram_iovec TRACE

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Date:	Fri, 28 Aug 2009 16:50:13 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Neil Horman <nhorman@...driver.com>
cc:	netdev@...r.kernel.org, davem@...emloft.net, mingo@...e.hu
Subject: Re: [PATCH] skb: Augment skb_copy_datagram_iovec TRACE_EVENT to dump
 more info


On Fri, 28 Aug 2009, Neil Horman wrote:

> Hey all-
> 	As promised in our previous discussion, I've augmented the
> skb_copy_datagram_iovec TRACE_EVENT to dump out the info I was previously
> gathering in the ftrace module thats been removed.  This patch gives me
> everything I need.  Tested and working by me
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>

Much better :-)

> 
> Neil
> 
> 
>  skb.h |   26 +++++++++++++++++++++++---
>  1 file changed, 23 insertions(+), 3 deletions(-)
> 
> 
> diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
> index 4b2be6d..45b9a3f 100644
> --- a/include/trace/events/skb.h
> +++ b/include/trace/events/skb.h
> @@ -7,6 +7,7 @@
>  #include <linux/skbuff.h>
>  #include <linux/netdevice.h>
>  #include <linux/tracepoint.h>
> +#include <net/sock.h>
>  
>  /*
>   * Tracepoint for free an sk_buff:
> @@ -42,16 +43,35 @@ TRACE_EVENT(skb_copy_datagram_iovec,
>  	TP_ARGS(skb, len),
>  
>  	TP_STRUCT__entry(
> -		__field(	const void *,		skbaddr		)
> +		__field(	const struct sk_buff *,	skb		)
>  		__field(	int,			len		)
> +		__field(	int,			anid		)
> +		__field(	int,			cnid		)
> +		__field(	int,			rx_queue	)
> +		__dynamic_array(char,		name,	IFNAMSIZ	)

For string fields we have a __string macro:

		__string(	char,			name		)

>  	),
>  
>  	TP_fast_assign(
> -		__entry->skbaddr = skb;
> +		struct net_device *dev = NULL;
> +		__entry->skb = skb;
>  		__entry->len = len;
> +		__entry->anid = page_to_nid(virt_to_page(skb->data));
> +		__entry->cnid = cpu_to_node(smp_processor_id());
> +		__entry->rx_queue = skb->queue_mapping;
> +		if (skb->sk) {
> +			dev = dev_get_by_index(sock_net(skb->sk), skb->iif);
> +		}

Nitpick, but this should still use normal Linux styling:

		if (skb->sk)
			dev = dev_get_by_index(sock_net(skb->sk), skb->iif);


> +		if (dev) {
> +			__assign_str(name, dev->name);
> +			dev_put(dev);
> +		} else {
> +			__assign_str(name, "Unknown");
> +		}

And remove the extra braces here too.

>  	),
>  
> -	TP_printk("skbaddr=%p len=%d", __entry->skbaddr, __entry->len)
> +	TP_printk("skb=%p anid=%d cnid=%d len=%d rx_queue=%d name=%s",
> +			__entry->skb, __entry->anid, __entry->cnid,
> +			__entry->len, __entry->rx_queue, __get_str(name))
>  );
>  
>  #endif /* _TRACE_SKB_H */
> 

Other than that, this looks good.

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve


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