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

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Message-ID: <CABPqkBTCEaDy9in75_=uu9U_4w5=wgyKDaAZ-jYHnbj-6vs9Sw@mail.gmail.com>
Date:	Thu, 7 Jun 2012 12:36:22 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.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 7, 2012 at 12:29 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> 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.

Agreed.
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