linux-kernel - [PATCH 0/4] workqueue_tracepoint: Add worklet tracepoints for worklet lifecycle tracing

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Date:	Fri, 24 Apr 2009 19:42:19 +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: [PATCH 0/4] workqueue_tracepoint: Add worklet tracepoints for worklet
 lifecycle tracing

Ingo Molnar wrote:
> ...
> 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.
> 
> 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
> 
Hello, Ingo

These patchs add tracepoints for per-worklet tracing.
Now we have enough tracepoints to start makeing trace_workqueue.c support
worklet time mesurement.

Thanks
Zhaolei

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