linux-kernel - Re: [PATCH v3 1/1] ftrace, workqueuetrace: Make workqueuetracepoints use TRACE

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Date:	Mon, 20 Apr 2009 09:30:03 +0800
From:	"Zhaolei" <zhaolei@...fujitsu.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"Frederic Weisbecker" <fweisbec@...il.com>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Tom Zanussi" <tzanussi@...il.com>, <linux-kernel@...r.kernel.org>,
	"Oleg Nesterov" <oleg@...hat.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 1/1] ftrace, workqueuetrace: Make workqueuetracepoints use TRACE_EVENT macro

* From: "Ingo Molnar" <mingo@...e.hu>
> 
> * Zhaolei <zhaolei@...fujitsu.com> wrote:
> 
>> +TRACE_EVENT(workqueue_insertion,
>> +TRACE_EVENT(workqueue_execution,
>> +TRACE_EVENT(workqueue_creation,
>> +TRACE_EVENT(workqueue_destruction,
> 
> I'm missing all the worklet tracepoints i suggested. (and i think 
> which you had in earlier versions)
> 
> Basically, i'd suggest the following complete set of events instead:
> 
> TRACE_EVENT(workqueue_create
> TRACE_EVENT(workqueue_flush              /* NEW */
> TRACE_EVENT(workqueue_destroy
> 
> TRACE_EVENT(worklet_enqueue              /* NEW */
> TRACE_EVENT(worklet_enqueue_delayed      /* NEW */
> 
> TRACE_EVENT(worklet_execute              /* instead of workqueue_execution */
> TRACE_EVENT(worklet_complete             /* NEW */
> 
> TRACE_EVENT(worklet_cancel               /* NEW */
> 
> This allows the understanding of the life cycle of a workqueue and 
> of worklets that enter that workqueue. Note the distinction between 
> workqueue and worklet (work) - that is essential.
Hello, Ingo

Thanks for your suggest.
I read distinction between workqueue and worklet.
In my schedule, this patch is first step of our target, my image of steps is:
  1: Move current workqueuetracepoints into TRACEEVENT (this patch)
  2: Make workqueuetrace support per-worklet output (doing)
  3: Add time information to workqueuetrace's worklet stat (need above new TRACEPOINT)

So, i prepared to add new worklet tracepoints in step3.
What's your opinion?

Thanks
Zhaolei
> 
> The parameters of the events are obvious, with one detail: i'd 
> suggest a 'cpu' parameter to the enqueue events, to allow the 
> mapping of the _on(..cpu) variants too.
> 
> I would not bother with schedule_on_each_cpu() instrumentation - 
> it's rarely used.
> 
> Ingo
> 
>