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

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Message-ID: <20240307212356.2e4d77d7@gandalf.local.home>
Date: Thu, 7 Mar 2024 21:23:56 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Kassey Li <quic_yingangl@...cinc.com>
Cc: <mhiramat@...nel.org>, <mathieu.desnoyers@...icios.com>,
 <linux-kernel@...r.kernel.org>, <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] workqueue: add function in event of
 workqueue_activate_work

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

> ---
>  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)
>  );
>  
>  /**