On Mon, 22 Jul 2013, Andi Kleen wrote:

> From: Andi Kleen <[email protected]>
> 
> Add a precise qualifier, like cpu/event=0x3c,precise=1/

So you're adding this to "events/" but not to "format/"?

This breaks the ABI, which specifies that the only fields
that can appear in a sysfs events specifier must exist under
the format directory.

This was what I worried about when I said people are going to start 
leaking perf tool specific events into the kernel sysfs tree.

This will break various existing programs.

Vince
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