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

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Message-ID: <alpine.DEB.2.00.1104261648400.32482@cl320.eecs.utk.edu>
Date:	Tue, 26 Apr 2011 16:51:08 -0400 (EDT)
From:	Vince Weaver <vweaver1@...s.utk.edu>
To:	Ingo Molnar <mingo@...e.hu>
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

On Tue, 26 Apr 2011, Ingo Molnar wrote:

> The kernel development process is in essence an abstraction engine, and if you 
> expect something else you'll probably be facing a lot of frustrating episodes 
> in the future as well where others try to abstract out meaningful 
> generalizations.

yes, but you are taking abstraction to the extreme.

A filesystem abstracts out the access to raw disk... but under Linux we 
still allow raw access to /dev/sda

TCP/IP abstracts out the access to the network... but under Linux we still 
allow creating raw packets.

It is fine to have some sort of high-level abstraction of perf events for 
those who don't have PhDs in computer architecture.  Fine.  But don't get 
in the way of people who know what they are doing.

Vince
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