linux-kernel - Re: [PATCH 08/19] perf c2c: Shared data analyser

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Message-ID: <20140303194839.GD6835@laptop.programming.kicks-ass.net>
Date:	Mon, 3 Mar 2014 20:48:39 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Joe Mario <jmario@...hat.com>, Don Zickus <dzickus@...hat.com>,
	Davidlohr Bueso <davidlohr@...com>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>, jolsa@...hat.com,
	fowles@...each.com, eranian@...gle.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Richard Fowles <rfowles@...hat.com>
Subject: Re: [PATCH 08/19] perf c2c: Shared data analyser

On Mon, Mar 03, 2014 at 07:58:19PM +0100, Andi Kleen wrote:
> Haswell is best however because it can report addresses on far more
> events.

Sure; however I think the code to data structure mapping might be more
useful still. Its very hard to map a random address into a heap and find
a fitting data structure. You'd need some allocator with a reverse map,
which to me seems like too much overhead for normal runtime use.
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