Re: [PATCH] tracing, perf: add more power related events

[Steven Rostedt <rostedt@xxxxxxxxxxx>]

On Wed, 2010-09-22 at 19:30 +0200, Peter Zijlstra wrote:
> On Wed, 2010-09-22 at 10:06 -0700, Arjan van de Ven wrote:
> 

> That said, I really didn't read this discussion much, but your stance
> seems to be that any tracepoint you use must stay valid, and I object to
> that.

We could add a TRACE_EVENT_ABI() as Ingo has been suggesting. If
anything, it could mean that the given tracepoint will always have the
same name. And perhaps the data it holds will always be there, but may
also be extended.

> 
> What will do you do when we include a new scheduling policy and all the
> scheduler tracepoints need to change? (yes that's really going to
> happen)

The tracepoint sched_switch should stay the same. We may add more data,
but the comm, pid, prio => comm, pid, prio, I don't see going away.

> 
> I'm not going to carry double tracepoints, and I'm not going to not
> merge that policy. 

Not sure what you mean by "double tracepoints"

-- Steve


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