linux-kernel - Re: [PATCH v2] workqueue: add function in event of workqueue_activate

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Date: Wed, 20 Mar 2024 07:49:05 +0800
From: kassey li <kassey_li_1216@...look.com>
To: tj@...nel.org
Cc: mhiramat@...nel.org, mathieu.desnoyers@...icios.com,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 Kassey Li <quic_yingangl@...cinc.com>, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v2] workqueue: add function in event of
 workqueue_activate_work



on 2024/3/8 10:23, Steven Rostedt wrote:
> On Fri, 8 Mar 2024 10:18:18 +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.
>>
>>      workqueue_activate_work: work struct ffffff80413a78b8 function=vmstat_update
>>
>> Signed-off-by: Kassey Li <quic_yingangl@...cinc.com>
>> ---
>> Changelog:
>> v1: https://lore.kernel.org/all/20240308010929.1955339-1-quic_yingangl@quicinc.com/
>> v1->v2:
>> - do not follow checkpatch in TRACE_EVENT() macros
>> - add sample "workqueue_activate_work: work struct ffffff80413a78b8 function=vmstat_update"
> 
>  From a tracing POV,
> 
> Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> 
> -- Steve

hello, Tejun, may you have a chance to review this change ?

> 
>> ---
>>   include/trace/events/workqueue.h | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
>> index 262d52021c23..6ef5b7254070 100644
>> --- a/include/trace/events/workqueue.h
>> +++ b/include/trace/events/workqueue.h
>> @@ -64,13 +64,15 @@ TRACE_EVENT(workqueue_activate_work,
>>   
>>   	TP_STRUCT__entry(
>>   		__field( void *,	work	)
>> +		__field( void *,	function)
>>   	),
>>   
>>   	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)
>>   );
>>   
>>   /**
> 
>