linux-kernel - Re: ftrace scripts and make V=1

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Message-ID: <20090805081824.GA1810@elte.hu>
Date:	Wed, 5 Aug 2009 10:18:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Dave Airlie <airlied@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ftrace scripts and make V=1


* Sam Ravnborg <sam@...nborg.org> wrote:

> On Wed, Aug 05, 2009 at 05:23:26PM +1000, Dave Airlie wrote:
> > Hey,
> > 
> > So I spent 3-4 hrs today (I'm stupid yes) tracking down a .o breakage by
> > blaming rawhide gcc/binutils as I was using make V=1and seeing only the
> > compiler chain running,
> > 
> > However some ftrace script was sneaking in afterwards
> > and screwing up the .o without mentioning itself.
> > 
> > Surely V=1 should print all these shitty scripts its running?
> 
> The problem is that V=1 is already too chatty,
> so people sometimes hide their stuff - as in this case.
> 
> I have for some time thought about adding some option
> so we can select between:
>  - less chatty than today - but print the usefull stuff
>  - full debug - print almost everything
> 
> It is not that this is hard to implment.
> But I never have made up my mind how to enable this.
> 
> V=1 - could be the "less chatty" mode
> V=2 - could be the "full debug mode"
> 
> But we already use "V=2" to tell what caused a file to be rebuild.
> This is on the other hand very seldomly used so we could get
> away with a new way to request this.
> So we limit V=n to select between different verbosity levels.
> 
> What do you think?

definitely sounds useful ...

	Ingo
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