linux-kernel - Re: [PATCH 1/1] ARM: oprofile: add A5/A7/A15 entries in op_perf

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Message-ID: <20121123141025.GG24690@rric.localhost>
Date:	Fri, 23 Nov 2012 15:10:25 +0100
From:	Robert Richter <rric@...nel.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Maynard Johnson <maynardj@...ibm.com>,
	"jgq516@...il.com" <jgq516@...il.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/1] ARM: oprofile: add A5/A7/A15 entries in op_perf_name

On 20.11.12 17:08:17, Will Deacon wrote:
> > The advantage of a solution where userland updates cpu_type is that we
> > never need to update the kernel anymore. This means, cpu detection can
> > be part of the tools.
> 
> True, but the kernel-side perf code still needs updating to support the new
> CPU so I don't think you win much.

You also need perf support to use operf. If oprofile can update
cpu_type, the oprofile kernel interface would work for new hardware
without changes. We have support for both then, operf and opcontrol.

-Robert


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