Re: [Qemu-devel] [PATCH, RFC] Sparc: convert some debug printf statements to tracepoints

[Andreas Färber]

Am 09.10.2010 um 17:46 schrieb Blue Swirl:

> On Sat, Oct 9, 2010 at 3:35 PM, Andreas Färber  
> <address@hidden> wrote:
> > Am 09.10.2010 um 17:10 schrieb Blue Swirl:
> >
> > > Replace some debug printf statements with tracepoints.
> > >
> > > Signed-off-by: Blue Swirl <address@hidden>
> > > ---
> > > I think tracing way is more flexible than current conditional  
> > > code. I
> > > remember wading through hundreds of megs of DPRINTF output looking  
> > > for
> > > a clue about a specific event, so being able to control the trace
> > > dynamically is invaluable.
> >
> > While this may in theory be right, in practice the nop backend  
> > gives us
> > nothing and the simple trace backend still has porting issues that  
> > need to
> > be fixed.
>
> Which issues, do you mean that Python isn't available for all  
> platforms?

Python is installable on Win32, I'm talking about build failures, I'll  
check later.

> > I remember hacking around some time-related problems on Haiku (it  
> > was using
> > an optional POSIX feature without check/wrapper), and there was a  
> > comment
> > saying that similar changes need to be done for Win32 support too.
> >
> > Has anyone looked into a DTrace backend btw?
>
> Is that more portable than the simple backend?

No, but it's the native trace framework on Solaris and Mac OS X - two  
platforms where I have not yet checked whether the simple backend  
builds and works.
It's also been ported to FreeBSD, I think.

Andreas