linux-kernel - Re: [patch 0/3] [Announcement] Performance Counters for Linux

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Message-Id: <1228566879.16244.4.camel@lappy.programming.kicks-ass.net>
Date:	Sat, 06 Dec 2008 13:34:39 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephane Eranian <eranian@...glemail.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Richter <robert.richter@....com>,
	Arjan van de Veen <arjan@...radead.org>,
	Peter Anvin <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch 0/3] [Announcement] Performance Counters for Linux

On Sat, 2008-12-06 at 11:05 +1100, Paul Mackerras wrote:
> Now, the tables in perfmon's user-land libpfm that describe the
> mapping from abstract events to event-selector values and the
> constraints on what events can be counted together come to nearly
> 29,000 lines of code just for the IBM 64-bit powerpc processors.
> 
> Your API condemns us to adding all that bloat to the kernel, plus the
> code to use those tables.

Since you need those tables and that code anyway, and in a solid
reliable way, what is the objection of carrying it in the kernel?

Furthermore, is there a good technical reason these cpus are so
complicated to use?

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