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

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Date:	Fri, 17 Apr 2009 22:29:37 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ingo Molnar <mingo@...e.hu>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	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 Fri, Apr 17, 2009 at 01:36:58PM -0400, Steven Rostedt wrote:
> 
> 
> On Fri, 17 Apr 2009, Peter Zijlstra wrote:
> 
> > On Fri, 2009-04-17 at 10:25 -0700, Jeremy Fitzhardinge wrote:
> > > Ingo Molnar wrote:
> > > > We could zap all pending trace entries on module unload (it is a 
> > > > rare operation)
> > > 
> > > ....Unless you're trying to trace something across a module unload.  I 
> > > don't know if its at all practical, but it would be nice to just zap the 
> > > pointers within the buffer, rather than the whole buffer.
> > 
> > I think the new __string() thing that's in the works will avoid the
> > whole problem by copying the string into the buffer, instead of keeping
> > a reference.
> 
> Speaking of which. We have not heard back from Frederic on this yet. I 
> hope he's taking a break, enjoying the sun, and not stuck on some tricky 
> macro crap ;-)
> 
> -- Steve
>



Oh you haven't yet received my mail about that?
It said I was cheering up about your and Peter's idea of using offsets
instead of pointer because of the end result:

- We can use as much __string() as we want
- No need for something else, such as the strcpy bits
- We are not forced to put it in the end of the patch
- Which means I will implement that in a v3 very soon ;-)

Frederic.

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