linux-kernel - Re: [RFC PATCH 0/3]perf/core: extend perf_reg and perf_sample_regs

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Message-ID: <20151106092430.GO3604@twins.programming.kicks-ass.net>
Date:	Fri, 6 Nov 2015 10:24:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 0/3]perf/core: extend perf_reg and
 perf_sample_regs_intr

On Fri, Nov 06, 2015 at 12:57:17PM +0530, Madhavan Srinivasan wrote:
> 
> 
> On Thursday 05 November 2015 06:37 PM, Peter Zijlstra wrote:
> > On Thu, Nov 05, 2015 at 02:16:15AM +0530, Madhavan Srinivasan wrote:
> >> Second patch updates struct arch_misc_reg for arch/powerpc with pmu registers
> >> and adds offsetof macro for the same. It extends perf_reg_value()
> >> to use reg idx to decide on struct to return value from.
> > Why; what's in those regs?
> 
> Was out and did not have access to mail, so missed to respond in time.
> 
> In current implementation of patch 2, have added 
> few pmu control/status and counter registers,
> which give additional information about the PMU context
> for the sample.

Yes, I saw that, you still haven't answered the question though. What is
in those regs? Why is exposing that information like this the best
option.
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