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

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Message-Id: <1255439822.7113.1541.camel@gandalf.stny.rr.com>
Date:	Tue, 13 Oct 2009 09:17:02 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
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

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.

-- Steve


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