linux-kernel - Re: [PATCH] [1/3] oprofile: re-add force_arch

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Message-ID: <20090506125026.GM9593@erda.amd.com>
Date:	Wed, 6 May 2009 14:50:27 +0200
From:	Robert Richter <robert.richter@....com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	oprofile-list@...ts.sf.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [1/3] oprofile: re-add force_arch_perfmon option

Andi,

I applied your patches. Please see my follow on patches and test them.

Thanks,

-Robert

On 27.04.09 17:44:11, Andi Kleen wrote:
> 
> This re-adds the force_arch_perfmon option that was in the original
> arch perfmon patchkit. Originally this was rejected in favour 
> of a generalized perfmon=name option, but it turned out implementing
> the later in a reliable way is hard (and it would have been easy
> to crash the kernel if a user gets it wrong) 
> 
> But now Atom and Core i7 support being readded a user would
> need to update their oprofile userland to beyond 0.9.4 to use oprofile again
> on Atom or Core i7.
> 
> To avoid this problem readd the force_arch_perfmon option.
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 
> ---
>  Documentation/kernel-parameters.txt |    6 ++++++
>  arch/x86/oprofile/nmi_int.c         |    6 ++++++
>  2 files changed, 12 insertions(+)
> 
> Index: linux-2.6.30-rc3-ak/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.30-rc3-ak.orig/Documentation/kernel-parameters.txt	2009-04-25 19:11:59.000000000 +0200
> +++ linux-2.6.30-rc3-ak/Documentation/kernel-parameters.txt	2009-04-27 13:20:29.000000000 +0200
> @@ -1648,6 +1648,12 @@
>  	oprofile.timer=	[HW]
>  			Use timer interrupt instead of performance counters
>  
> +	oprofile.force_arch_perfmon=1	[X86]
> +			Force use of architectural perfmon instead of
> +			the CPU specific event set.
> +			This might be useful if you have older oprofile
> +			userland or if you want common events over Intel CPUs.
> +
>  	osst=		[HW,SCSI] SCSI Tape Driver
>  			Format: <buffer_size>,<write_threshold>
>  			See also Documentation/scsi/st.txt.
> Index: linux-2.6.30-rc3-ak/arch/x86/oprofile/nmi_int.c
> ===================================================================
> --- linux-2.6.30-rc3-ak.orig/arch/x86/oprofile/nmi_int.c	2009-02-15 12:09:09.000000000 +0100
> +++ linux-2.6.30-rc3-ak/arch/x86/oprofile/nmi_int.c	2009-04-27 13:20:29.000000000 +0200
> @@ -389,10 +389,16 @@
>  	return 0;
>  }
>  
> +int force_arch_perfmon;
> +module_param(force_arch_perfmon, int, 0);
> +
>  static int __init ppro_init(char **cpu_type)
>  {
>  	__u8 cpu_model = boot_cpu_data.x86_model;
>  
> +	if (force_arch_perfmon && cpu_has_arch_perfmon)
> +		return 0;
> +
>  	switch (cpu_model) {
>  	case 0 ... 2:
>  		*cpu_type = "i386/ppro";
> 

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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