linux-kernel - Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow tracing units

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Message-ID: <20131219151024.GI16438@laptop.programming.kicks-ass.net>
Date:	Thu, 19 Dec 2013 16:10:24 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow
 tracing units

On Thu, Dec 19, 2013 at 04:30:53PM +0200, Alexander Shishkin wrote:
> So I'd like to steer away from the ways in which hardware can be broken
> and talk about a usable interface, to begin with.

Just dump it into the regular one buffer like I outlined.

That said; we very much need to have at least two architectures
implemented for any of this code to move.

But we cannot ignore the hardware trainwreck; we cannot shape our
interface around something that's utterly broken.

Some hardware is just too broken to support.
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