linux-kernel - Re: [PATCH 1/2 v3] tracing/events: provide string with undefined size support

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Date:	Sun, 19 Apr 2009 14:15:36 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Zhaolei <zhaolei@...fujitsu.com>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/2 v3] tracing/events: provide string with undefined
 size support

> @@ -417,18 +495,22 @@ static struct ftrace_event_call event_##call;				\
>  									\
>  static void ftrace_raw_event_##call(proto)				\
>  {									\
> +	struct ftrace_str_offsets_##call __maybe_unused __str_offsets;  \
>  	struct ftrace_event_call *call = &event_##call;			\
>  	struct ring_buffer_event *event;				\
>  	struct ftrace_raw_##call *entry;				\
>  	unsigned long irq_flags;					\
> +	int __str_size = 0;						\
>  	int pc;								\
>  									\
>  	local_save_flags(irq_flags);					\
>  	pc = preempt_count();						\
>  									\
> +	tstruct;							\
> +									\
>  	event = trace_current_buffer_lock_reserve(event_##call.id,	\
> -				  sizeof(struct ftrace_raw_##call),	\
> -				  irq_flags, pc);			\
> +				 sizeof(struct ftrace_raw_##call) + __str_size,\

sizeof(*entry) will make it much shorter. ;)

> +				 irq_flags, pc);			\
>  	if (!event)							\
>  		return;							\
>  	entry	= ring_buffer_event_data(event);			\

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