linux-kernel - Re: [PATCH] workqueue: add function in event of workqueue_activate

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Date: Fri, 8 Mar 2024 10:20:40 +0800
From: Kassey Li <quic_yingangl@...cinc.com>
To: Steven Rostedt <rostedt@...dmis.org>
CC: <mhiramat@...nel.org>, <mathieu.desnoyers@...icios.com>,
        <linux-kernel@...r.kernel.org>, <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH] workqueue: add function in event of
 workqueue_activate_work



On 2024/3/8 9:50, Steven Rostedt wrote:
> On Fri, 8 Mar 2024 09:09:29 +0800
> Kassey Li <quic_yingangl@...cinc.com> wrote:
> 
>> The trace event "workqueue_activate_work" only print work struct.
>> However, function is the region of interest in a full sequence of work.
>> Current workqueue_activate_work trace event output:
>>
>>      workqueue_activate_work: work struct ffffff88b4a0f450
>>
>> With this change, workqueue_activate_work will print the function name,
>> align with workqueue_queue_work/execute_start/execute_end event.
>>
>> checkpatch.pl will report below error for the space:
>>
>> 	ERROR: space prohibited after that open parenthesis '('
>> 	#28: FILE: include/trace/events/workqueue.h:67:
>> 	+               __field( void *,        function)
>>
>> 	total: 1 errors, 0 warnings, 16 lines checked
>>
>> fix this error.
>>
>> Signed-off-by: Kassey Li <quic_yingangl@...cinc.com>
>> ---
>>   include/trace/events/workqueue.h | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
>> index 262d52021c23..a42c1a293459 100644
>> --- a/include/trace/events/workqueue.h
>> +++ b/include/trace/events/workqueue.h
>> @@ -63,14 +63,16 @@ TRACE_EVENT(workqueue_activate_work,
>>   	TP_ARGS(work),
>>   
>>   	TP_STRUCT__entry(
>> -		__field( void *,	work	)
>> +		__field(void *,	work)
>> +		__field(void *,	function)
> 
> Note, please do not follow checkpatch in TRACE_EVENT() macros. It simply
> doesn't understand it. The above is supposed to be similar to structure
> formatting.
> 
> ie:
> 	struct __entry {
> 		void		*work;
> 		void		*function;
> 	};
> 
> 	TP_STRUCT__entry(
> 		__field( void *,	work		)
> 		__field( void *,	function	)
>    	),
> 
> That looks much better.
> 
> -- Steve
> 

thanks for the remind.
send out the v2 as your suggest:
https://lore.kernel.org/all/20240308021818.2306176-1-quic_yingangl@quicinc.com/
> 
>>   
>>   	TP_fast_assign(
>>   		__entry->work		= work;
>> +		__entry->function	= work->func;
>>   	),
>>   
>> -	TP_printk("work struct %p", __entry->work)
>> +	TP_printk("work struct %p function=%ps ", __entry->work, __entry->function)
>>   );
>>   
>>   /**
>