linux-kernel - Re: [PATCH 1/6] perf_counter: powerpc: Enable use of software counters on 32-bit powerpc

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Message-Id: <A731338A-E954-46D9-8BF7-6E74C797209C@kernel.crashing.org>
Date:	Wed, 17 Jun 2009 09:10:49 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Ingo Molnar <mingo@...e.hu>, benh@...nel.crashing.org,
	linuxppc-dev@...abs.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] perf_counter: powerpc: Enable use of software counters on 32-bit powerpc


On Jun 17, 2009, at 6:50 AM, Paul Mackerras wrote:

> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/ 
> platforms/Kconfig.cputype
> index cca6b4f..dd9f3ec 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -1,7 +1,7 @@
> config PPC64
> 	bool "64-bit kernel"
> 	default n
> -	select HAVE_PERF_COUNTERS
> +	select PPC_HAVE_PMU_SUPPORT
> 	help
> 	  This option selects whether a 32-bit or a 64-bit kernel
> 	  will be built.
> @@ -243,6 +243,15 @@ config VIRT_CPU_ACCOUNTING
>
> 	  If in doubt, say Y here.
>
> +config PPC_HAVE_PMU_SUPPORT
> +       bool

what does this mean?

> +
> +config PPC_PERF_CTRS
> +       def_bool y
> +       depends on PERF_COUNTERS && PPC_HAVE_PMU_SUPPORT
> +       help
> +         This enables the powerpc-specific perf_counter back-end.

Can we distinguish between the two different architected perf counters  
programming models to start with.  Maybe something like:

PPC_BOOK3S_PERF_CTRS and PPC_BOOK3E_PERF_CTRS (or  
PPC_SERVER_PERF_CTRS / PPC_EMB_PERF_CTRS)


>
> +
> config SMP
> 	depends on PPC_STD_MMU || FSL_BOOKE
> 	bool "Symmetric multi-processing support"
> -- 
> 1.6.0.4
>

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