linux-kernel - Re: [PATCH] powerpc/perf: Implement get_cpu

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Date:	Thu, 7 Aug 2014 10:44:37 +0200
From:	Tobias Klauser <tklauser@...tanz.ch>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	jolsa@...hat.com, andi@...stfloor.org,
	Michael Ellerman <mpe@...erman.id.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/perf: Implement get_cpu_str()

On 2014-08-06 at 02:17:55 +0200, Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> wrote:
> powerpc/perf: Implement get_cpu_str()
> 
> With a file like ~/.cache/pmu-events/004d0100-core.json describing
> Power8 PMU events, we would need to run:
> 
> 	perf stat \
> 		--events-file ~/.cache/pmu-events/004d0100-core.json \
> 		-e PM_CYC sleep 1
> 
> With this get_cpu_str(), on Powerpc, we can skip the --events-file option
> and run:
> 
> 	perf stat -e PM_CYC sleep 1
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
> ---
> Note: This patch is based on Andi Kleen's recent patchset
> 
> 	https://lkml.org/lkml/2014/7/30/693
> 
> Changelog[v2]:
> 	[Michael Ellerman]: Use PVR instead of AUXV variables
> 
>  tools/perf/arch/powerpc/util/header.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c
> index 6c1b8a7..1bb400e8 100644
> --- a/tools/perf/arch/powerpc/util/header.c
> +++ b/tools/perf/arch/powerpc/util/header.c
> @@ -6,6 +6,7 @@
>  
>  #include "../../util/header.h"
>  #include "../../util/util.h"
> +#include "../../util/jevents.h"
>  
>  #define mfspr(rn)       ({unsigned long rval; \
>  			 asm volatile("mfspr %0," __stringify(rn) \
> @@ -32,3 +33,14 @@ get_cpuid(char *buffer, size_t sz)
>  	}
>  	return -1;
>  }
> +
> +char *
> +get_cpu_str(void)
> +{
> Changelog[v2]:
> 	[Michael Ellerman]: Use PVR instead of AUXV variables

This was probably not intended to be here and the patch does not apply
due to these lines.

> 
> +        char *bufp;
> +
> +        if (asprintf(&bufp, "%.8lx-core", mfspr(SPRN_PVR)) < 0)
> +		bufp = NULL;
> +
> +        return bufp;
> +}
> -- 
> 1.8.3.1
> 
> --
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