linux-kernel - Re: [PATCH] tracing/lockdep: turn lock->name into an array

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Message-ID: <20090413230110.GB817@elte.hu>
Date:	Tue, 14 Apr 2009 01:01:10 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Zhaolei <zhaolei@...fujitsu.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] tracing/lockdep: turn lock->name into an array


* Frederic Weisbecker <fweisbec@...il.com> wrote:

>  	TP_STRUCT__entry(
> -		__field(const char *, name)
> +		__array(char, name, LOCK_NAME_SIZE)
>  		__field(unsigned long, wait_usec)
>  		__field(unsigned long, wait_nsec_rem)
>  	),

Hm. These constants tend to grow - 25 will certainly be too narrow. 
But increasing it increases the record size as well.

I think we'll need an embedded __string() type, with a length field 
(but still also zero-delimited, for convenience), hm?

	Ingo
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