linux-kernel - Re: [PATCH 1/1] perf tools: Add missing user space support for config1/config2

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Message-ID: <20110425175444.GC28239@elte.hu>
Date:	Mon, 25 Apr 2011 19:54:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vince Weaver <vweaver1@...s.utk.edu>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/1] perf tools: Add missing user space support for
 config1/config2


* Vince Weaver <vweaver1@...s.utk.edu> wrote:

> [...] The kernel has no business telling users which perf events are 
> interesting, or limiting them! [...]

The policy is very simple and common-sense: if a given piece of PMU 
functionality is useful enough to be exposed via a raw interface, then
it must be useful enough to be generalized as well.

> [...]  What is this, windows?

FYI, this is how the Linux kernel has operated from day 1 on: we support 
hardware features to abstract useful highlevel functionality out of it.
I would not expect this to change anytime soon.

Thanks,

	Ingo
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