linux-kernel - Re: [RFC PATCH v3 2/5] napi: convert trace_napi_poll to TRACE

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Message-ID: <20100720110952.GB1995@hmsreliant.think-freely.org>
Date:	Tue, 20 Jul 2010 07:09:52 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Koki Sanagi <sanagi.koki@...fujitsu.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	davem@...emloft.net, kaneshige.kenji@...fujitsu.com,
	izumi.taku@...fujitsu.com, kosaki.motohiro@...fujitsu.com,
	laijs@...fujitsu.com, scott.a.mcmillan@...el.com,
	rostedt@...dmis.org, eric.dumazet@...il.com, fweisbec@...il.com,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [RFC PATCH v3 2/5] napi: convert trace_napi_poll to TRACE_EVENT

On Tue, Jul 20, 2010 at 09:46:51AM +0900, Koki Sanagi wrote:
> From: Neil Horman <nhorman@...driver.com>
> 
> This patch converts trace_napi_poll from DECLARE_EVENT to TRACE_EVENT to improve
> the usability of napi_poll tracepoint.
> 
>           <idle>-0     [001] 241302.750777: napi_poll: napi poll on napi struct f6acc480 for device eth3
>           <idle>-0     [000] 241302.852389: napi_poll: napi poll on napi struct f5d0d70c for device eth1
> 
> An original patch is below.
> http://marc.info/?l=linux-kernel&m=126021713809450&w=2
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
> And add a fix by Steven Rostedt.
> http://marc.info/?l=linux-kernel&m=126150506519173&w=2
> 
> Signed-off-by: Koki Sanagi <sanagi.koki@...fujitsu.com>
> ---
>  include/trace/events/napi.h |   25 +++++++++++++++++++++++--
>  1 files changed, 23 insertions(+), 2 deletions(-)
> 
> diff --git a/include/trace/events/napi.h b/include/trace/events/napi.h
> index 188deca..8fe1e93 100644
> --- a/include/trace/events/napi.h
> +++ b/include/trace/events/napi.h
> @@ -6,10 +6,31 @@
>  
>  #include <linux/netdevice.h>
>  #include <linux/tracepoint.h>
> +#include <linux/ftrace.h>
> +
> +#define NO_DEV "(no_device)"
> +
> +TRACE_EVENT(napi_poll,
>  
> -DECLARE_TRACE(napi_poll,
>  	TP_PROTO(struct napi_struct *napi),
> -	TP_ARGS(napi));
> +
> +	TP_ARGS(napi),
> +
> +	TP_STRUCT__entry(
> +		__field(	struct napi_struct *,	napi)
> +		__string(	dev_name, napi->dev ? napi->dev->name : NO_DEV)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->napi = napi;
> +		__assign_str(dev_name, napi->dev ? napi->dev->name : NO_DEV);
> +	),
> +
> +	TP_printk("napi poll on napi struct %p for device %s",
> +		__entry->napi, __get_str(dev_name))
> +);
> +
> +#undef NO_DEV
>  
>  #endif /* _TRACE_NAPI_H_ */
>  
> 
NAK, This change will create a build break in the drop monitor code.  You'll
need to fix that up if you want to make this change.
Neil

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