linux-kernel - Re: [PATCH 0/4][RFC] event tracer

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Date:	Tue, 24 Feb 2009 20:39:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	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>,
	Arjan van de Ven <arjan@...radead.org>,
	Pekka Paalanen <pq@....fi>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Martin Bligh <mbligh@...gle.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH 0/4][RFC] event tracer


* Steven Rostedt <rostedt@...dmis.org> wrote:

> This is still RFC, do not pull.
> 
> This patch set gives the ability to add a format string and 
> args to a trace point declaration. Then it gives a tracer an 
> opportunity to override the header macro and use the default 
> trace format to trace the object.
> 
> For example (and used in this patch series), the sched 
> tracepoint declarations are moved from include/trace/sched.h 
> to include/trace/sched_event_types.h, and instead of using the 
> macro DECLARE_TRACE we use DECLARE_TRACE_FMT. The first three 
> arguments are the same, but it adds 2 more arguments. A printf 
> format and arguments.
> 
> The new trace/sched.h file contains:
> 
>   #include <linux/sched.h>
>   #include <linux/tracepoint.h>
> 
>   #include <trace/sched_event_types.h>
> 
> The sched_event_types.h file has:
> 
>  DECLARE_TRACE_FMT(sched_kthread_stop,
>         TPPROTO(struct task_struct *t),
>                   TPARGS(t),
>                    "task %s:%d", TPARGS(t->comm, t->pid));
> 
> The tracepoint.h defines DECLARE_TRACE_FMT as:
> 
>  #define DECLARE_TRACE_FMT(name, proto, args, fmt, fmt_args) \
>         DECLARE_TRACE(name, TPPROTO(proto), TPARGS(args))
> 
> 
> But in kernel/trace/events.c we have:
> 
>  /* trace/<type>.h here */
>  #include <trace/sched.h>
> 
>  #include "trace_events.h"
> 
>  /* trace/<type>_event_types.h here */
>  #include <trace/sched_event_types.h>
> 
> The trace_events.h redefines the DECLARE_TRACE_FMT and makes a 
> hook for to automate adding event points.
> 
> To add event points, convert to the DECLARE_TRACE_FMT, add 
> your default printf format, and then add to events.c, the 
> <type>.h and <type>_event_types.h as described. Then your 
> trace points will appear in the event tracer.
> 
> Next I'll convert the rest of the tracepoints that are already 
> defined to this format.

Looks very good - especially the VFS enumeration of all present 
tracepoints. Let me know when it gets into pullable state.

	Ingo
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