linux-kernel - Re: [PATCH] irq: add irq handler function name in ftrace

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Date:	Wed, 21 Aug 2013 15:26:30 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Li Fei <fei.li@...el.com>
Cc:	fweisbec@...il.com, mingo@...hat.com, rob@...dley.net,
	chuansheng.liu@...el.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] irq: add irq handler function name in ftrace

Thomas,

Are you OK with this change?

-- Steve


On Wed, 21 Aug 2013 11:44:21 +0800
Li Fei <fei.li@...el.com> wrote:

> At present, irq handler function name is not printed out when
> irq_handler_entry is added into trace event, which is inconvenient
> for debugging.
> In order to improve the debugging efficiency, print out the handler
> function name in irq_handler_entry.
> 
> Signed-off-by: Li Fei <fei.li@...el.com>
> Acked-by: Liu Chuansheng <chuansheng.liu@...el.com>
> ---
>  Documentation/trace/ftrace.txt |    8 ++++----
>  include/trace/events/irq.h     |    5 ++++-
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
> index b937c6e..907ecbd 100644
> --- a/Documentation/trace/ftrace.txt
> +++ b/Documentation/trace/ftrace.txt
> @@ -2701,10 +2701,10 @@ CPU:2 [LOST 11745 EVENTS]
>              bash-1998  [000] ..s2   138.733106: softirq_exit: vec=1 [action=TIMER]
>              bash-1998  [000] ..s2   138.733106: softirq_entry: vec=9 [action=RCU]
>              bash-1998  [000] ..s2   138.733109: softirq_exit: vec=9 [action=RCU]
> -            sshd-1995  [001] d.h1   138.733278: irq_handler_entry: irq=21 name=uhci_hcd:usb4
> -            sshd-1995  [001] d.h1   138.733280: irq_handler_exit: irq=21 ret=unhandled
> -            sshd-1995  [001] d.h1   138.733281: irq_handler_entry: irq=21 name=eth0
> -            sshd-1995  [001] d.h1   138.733283: irq_handler_exit: irq=21 ret=handled
> +            kworker/0:2-161  [001] d.h1   138.733278: irq_handler_entry: irq=17 name=i2c-designware-pci-7 func=i2c_dw_isr
> +            kworker/0:2-161  [001] d.h1   138.733280: irq_handler_exit: irq=17 ret=unhandled
> +            kworker/0:2-161  [001] d.h1   138.733281: irq_handler_entry: irq=17 name=mmc0 func=sdhci_irq
> +            kworker/0:2-161  [001] d.h1   138.733283: irq_handler_exit: irq=17 ret=handled
>  [...]
>  
>   # cat instances/zoot/trace
> diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
> index 1c09820..3497eb3 100644
> --- a/include/trace/events/irq.h
> +++ b/include/trace/events/irq.h
> @@ -43,14 +43,17 @@ TRACE_EVENT(irq_handler_entry,
>  	TP_STRUCT__entry(
>  		__field(	int,	irq		)
>  		__string(	name,	action->name	)
> +		__field(irq_handler_t, func)
>  	),
>  
>  	TP_fast_assign(
>  		__entry->irq = irq;
>  		__assign_str(name, action->name);
> +		__entry->func = action->handler;
>  	),
>  
> -	TP_printk("irq=%d name=%s", __entry->irq, __get_str(name))
> +	TP_printk("irq=%d name=%s func=%pf",
> +		__entry->irq, __get_str(name), __entry->func)
>  );
>  
>  /**

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