linux-kernel - Re: [PATCH 4/7] tracing: new format for specialized trace points

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Message-Id: <20090310144700.A48E.A69D9226@jp.fujitsu.com>
Date:	Tue, 10 Mar 2009 14:50:28 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 4/7] tracing: new format for specialized trace points

Hi Steven,

>  TRACE_EVENT(sched_switch,
> 
> 	TP_PROTO(struct rq *rq, struct task_struct *prev,
> 		 struct task_struct *next),
> 
> 	TP_ARGS(rq, prev, next),
> 
> 	TP_STRUCT__entry(
> 		__array(	char,	prev_comm,	TASK_COMM_LEN	)
> 		__field(	pid_t,	prev_pid			)
> 		__field(	int,	prev_prio			)
> 		__array(	char,	next_comm,	TASK_COMM_LEN	)
> 		__field(	pid_t,	next_pid			)
> 		__field(	int,	next_prio			)
> 	),
> 
> 	TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
> 		__entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
> 		__entry->next_comm, __entry->next_pid, __entry->next_prio),
> 
> 	TP_fast_assign(
> 		memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
> 		__entry->prev_pid	= prev->pid;
> 		__entry->prev_prio	= prev->prio;
> 		memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
> 		__entry->next_pid	= next->pid;
> 		__entry->next_prio	= next->prio;
> 	)
>  );

Could you please write the documentation how to make new tracepont and 
use various TP_ macro?
Some developer (include me) plan to add new tracepoint. but these macro
usage is a bit difficult.



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