linux-kernel - Re: [PATCH 2/2] kmemtrace: Use tracepoints instead of markers.

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Message-ID: <20081230140232.GG10635@localhost>
Date:	Tue, 30 Dec 2008 16:02:32 +0200
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] kmemtrace: Use tracepoints instead of markers.

On Tue, Dec 30, 2008 at 10:40:17AM -0200, Arnaldo Carvalho de Melo wrote:
> Em Tue, Dec 30, 2008 at 09:41:28AM +0200, Eduard - Gabriel Munteanu escreveu:
> > kmemtrace now uses tracepoints instead of markers. We no longer need to
> > use format specifiers. Also dropped kmemtrace_mark_alloc_node(), since
> > it's easy to pass -1 as the NUMA node without providing a needless and
> > long-named variant of the same function.
> > 
> > Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
> > diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
> > index 7555ce9..fe3cea2 100644
> > --- a/include/linux/slab_def.h
> > +++ b/include/linux/slab_def.h
> > @@ -76,8 +76,8 @@ found:
> >  
> >  		ret = kmem_cache_alloc_notrace(cachep, flags);
> >  
> > -		kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, _THIS_IP_, ret,
> > -				     size, slab_buffer_size(cachep), flags);
> > +		trace_kmalloc(_THIS_IP_, ret,
> > +			      size, slab_buffer_size(cachep), flags, -1);
> 
> Is there a way for a tracepoint to get the caller without having to pass
> it explicitely?
> 
> - Arnaldo

It might be possible, but for correctness DEFINE_TRACE() should use
__always_inline instead of inline.

But it is quite pointless. Sometimes we need _RET_IP_, sometimes
_THIS_IP_ and sometimes a parameter we've been passed. That's because we
want the IP of the caller, so it depends on whether this slab function
is __always_inline, non-inlined or deeply nested within other functions
(which can be as well __always_inline or non-inlined).


	Eduard

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