Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs

[Ingo Molnar]

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> What we do not want are exhaustive event lists for specific PMU 
> implementations, those are best left for userspace.

I'd refine this the following way:

 - We mandate proper in-kernel enumeration of all things event sources, for
   example /sys/devices/system/node/nodeN/node_events. Obviously an event source
   needs to be addressable for it to be useful to userspace.

 - We want generalized events expressed in those event containers that
   are used commonly. Whatever people find useful we can enumerate and what
   is enumerated is an ABI.

 - The 'rest' can go into /sys/devices/system/node/nodeN/node_events/raw_event/.
   These will never be guaranteed in an ABI way really (although will work in
   some cases) - those using raw event codes are really up to themselves and 
   if it ever gets in the way of proper, more expressive 
   enumeration/generalization it will have to yield.

These are the ground rules as i see them.

	Ingo
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