linux-kernel - Re: [tip:timers/tracing] hrtimer: Add tracepoint for hrtimers

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Message-ID: <20091013184150.GA17492@elte.hu>
Date:	Tue, 13 Oct 2009 20:41:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	mingo@...hat.com, hpa@...or.com, mathieu.desnoyers@...ymtl.ca,
	anton@...ba.org, linux-kernel@...r.kernel.org,
	peterz@...radead.org, zhaolei@...fujitsu.com,
	xiaoguangrong@...fujitsu.com, fweisbec@...il.com,
	tglx@...utronix.de, kosaki.motohiro@...fujitsu.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/tracing] hrtimer: Add tracepoint for hrtimers


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Tue, 2009-10-13 at 15:26 +0200, Ingo Molnar wrote:
> > * Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > On Tue, 2009-10-13 at 09:08 +0200, Ingo Molnar wrote:
> > > > * Steven Rostedt <rostedt@...dmis.org> wrote:
> > > > 
> > > 
> > > > > (unsigned long long)(((ktime_t) { .tv64 = REC->expires }).tv64)
> > > > > 
> > > > > Is not easy. It's basically implementing a C interpreter :-(
> > > > 
> > > > Btw., what i suggested quite some time ago was that we should bind 
> > > > tracepoints by emitting C source code stubs, which tools can then build 
> > > > and link in, using gcc.
> > > 
> > > Yeah, and I thought about that too. But that kills any chance of 
> > > running the trace on one box (non x86) and reading it on another 
> > > (x86). And that is one of my goals for this.
> > 
> > Why does it kill that chance?
> 
> Ah, I was thinking binary libraries from the trace points. But I 
> missed you said C source code.
> 
> But still, we need to build a way to convert big endian to little, as 
> well as perhaps converting 32bit to 64 bit longs. As well as vice 
> versa.

Exporting the print line as C in a convenient way does not in any way 
make it more difficult to define endianness and bit size - we have to do 
that anyway. It's largely orthogonal.

	Ingo
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