linux-kernel - Re: [PATCH 2/2] Markers Implementation for Preempt RCU Boost Tracing

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Message-Id: <1199317743.2438.8.camel@entropy>
Date:	Wed, 02 Jan 2008 15:49:03 -0800
From:	Nicholas Miell <nmiell@...cast.net>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"K. Prasad" <prasad@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	dipankar@...ibm.com, ego@...ibm.com, mathieu.desnoyers@...ymtl.ca,
	paulmck@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/2] Markers Implementation for Preempt RCU Boost
	Tracing


On Wed, 2008-01-02 at 11:33 -0500, Frank Ch. Eigler wrote:
> Hi -
> 
> On Wed, Jan 02, 2008 at 01:47:34PM +0100, Ingo Molnar wrote:
> > [...]
> > > FWIW, I'm not keen about the format strings either, but they don't 
> > > constitute a performance hit beyond an additional parameter.  It does 
> > > not need to actually get parsed at run time.
> > 
> > "only" an additional parameter. The whole _point_ behind these markers 
> > is for them to have minimal effect!
> 
> Agreed.  The only alternative I recall seeing proposed was my own
> cartesian-product macro suite that encodes parameter types into the
> marker function/macro name itself.  (Maybe some of that could be
> hidden with gcc typeof() magic.)  There appeared to be a consensus
> that this was more undesirable.  Do you agree?
> 
> 

C++ name mangling would be extremely useful here.


Actually, why isn't the DWARF information for the functions sufficient?

-- 
Nicholas Miell <nmiell@...cast.net>

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