linux-kernel - Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf on top of TP

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Date:	Thu, 6 May 2010 08:31:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Tejun Heo <tj@...nel.org>, efault@....de, avi@...hat.com,
	paulus@...ba.org, acme@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf
 on top of TP


* Peter Zijlstra <peterz@...radead.org> wrote:

> Well, I'd much rather just see a direct call in the code than having to 
> reverse engineer wth hangs onto that _EVENT() junk.

Direct calls into code were fine 10 years ago, but since then we got:

 - preempt notifiers
 - sw events
 - tracepoints

Which add up to a lot more than just a plain call into code.

Also, with the jump-optimizations we will have tracepoints that are _cheaper_ 
than a plain function call.

> Also, we don't need ABI muck for this.

we already have an ABIs in place here - this would just properly unify and 
enumerate it.

	Ingo
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