linux-kernel - Re: [PATCH 01/16] perf: Unified API to record selective sets of arch registers

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Message-ID: <20120607103148.GF19842@somewhere.redhat.com>
Date:	Thu, 7 Jun 2012 12:31:51 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, eranian@...gle.com,
	gorcunov@...nvz.org, tzanussi@...il.com, mhiramat@...hat.com,
	robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 01/16] perf: Unified API to record selective sets of arch
 registers

On Thu, Jun 07, 2012 at 12:29:23PM +0200, Peter Zijlstra wrote:
> On Thu, 2012-06-07 at 11:46 +0200, Frederic Weisbecker wrote:
> > 
> > Do you think that compat regs are always a subset of native regs in all
> > archs as in x86? Sounds logic but I'm asking just in case. If so then yeah
> > this should work. 
> 
> I can't answer this authoritatively but it would seem strange if this
> were not the case. But even if it were so, you could always frob both
> sets in a single space such that the shared registers overlap etc. 

Looks good. Let's take that direction then.
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