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

Ingo Molnar
2010-05-06T06:31:30Z

* Peter Zijlstra <peterz@infradead.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