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

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Date:	Tue, 14 Apr 2009 09:48:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
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>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/lockdep: turn lock->name into an array

On Tue, 2009-04-14 at 00:42 +0200, Frederic Weisbecker wrote:
> > +#define LOCK_NAME_SIZE       25
> 
> 
> 
> This constant may look a bit weird.
> I just started with the assumption that a full lock name
> will rarely exceed this length.
> 
> If you agree with it, I will expand the conversion of lockdep
> TRACE_FORMAT to TRACE_EVENTS with the same assumption.
> So that we will be able to use filters with locks events.

I really really hate this.

if you pick a size on the top end so that all lock->name's fit in,
you're wasting heaps of space, if you pick a median length, everything
will get truncated.

If you're going to do a copy, just do the print into the buffer by using
_FORMAT and be done with it.
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