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

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Date:	Fri, 22 Apr 2011 09:51:20 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	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>, eranian@...il.com,
	Arun Sharma <asharma@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [generalized cache events] Re: [PATCH 1/1] perf tools: Add
 missing user space support for config1/config2

> Once you have clear and precise definition, then we can look at the actual
> events and figure out a mapping.

It's unclear this can be even done. Linux runs on a wide variety of micro
architectures, with all kinds of cache architectures.

Micro architectures are so different. I suspect a "generic" definition would
need to be so vague as to be useless.

This in general seems to be the problem of the current cache events.

Overall for any interesting analysis you need to go CPU specific.
Abstracted performance analysis is a contradiction in terms.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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