Re: [PATCH 1/2] tools, perf: Add a precise event qualifier v2

From: Vince Weaver
Date: Wed Jul 24 2013 - 14:53:59 EST

On Tue, 23 Jul 2013, Sasha Levin wrote:

> It's probably fine to change a testing ABI once in a while, but when things
> like trinity start breaking that often due to ABI changes in the same exact
> place, that's too much IMO.

The problem is they want the ABI to be "whatever our closely-coupled
userspace perf tool accepts as input" which is an often-changing
complicated (and undocumented) set of LEX and YACC parsers.

I guess we could just give in and declare that to be the official
perf sysfs interface in the ABI documentation.

It's frustrating trying to maintain tools that use the perf_event
interface because the inclusion of perf in the kernel is used as an excuse
to constantly break the ABI.

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