linux-kernel - Re: [PATCH 2/2] FRV: Add basic performance counter support

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Date:	Wed, 1 Jul 2009 23:10:17 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, akpm@...ux-foundation.org, paulus@...ba.org,
	arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] FRV: Add basic performance counter support


* David Howells <dhowells@...hat.com> wrote:

> Add basic performance counter support to the FRV arch.
> 

that was fast :)

Looks good. There's two areas where we can improve the core 
perfcounters code:

> Signed-off-by: David Howells <dhowells@...hat.com>
> ---
> 
>  arch/frv/Kconfig                    |    1 +
>  arch/frv/include/asm/perf_counter.h |   17 +++++++++++++++++
>  arch/frv/lib/Makefile               |    2 +-
>  arch/frv/lib/perf_counter.c         |   19 +++++++++++++++++++
>  4 files changed, 38 insertions(+), 1 deletions(-)
>  create mode 100644 arch/frv/include/asm/perf_counter.h
>  create mode 100644 arch/frv/lib/perf_counter.c
> 
> 
> diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
> index 8a5bd7a..b86e19c 100644
> --- a/arch/frv/Kconfig
> +++ b/arch/frv/Kconfig
> @@ -7,6 +7,7 @@ config FRV
>  	default y
>  	select HAVE_IDE
>  	select HAVE_ARCH_TRACEHOOK
> +	select HAVE_PERF_COUNTERS
>  
>  config ZONE_DMA
>  	bool
> diff --git a/arch/frv/include/asm/perf_counter.h b/arch/frv/include/asm/perf_counter.h
> new file mode 100644
> index 0000000..ccf726e
> --- /dev/null
> +++ b/arch/frv/include/asm/perf_counter.h
> @@ -0,0 +1,17 @@
> +/* FRV performance counter support
> + *
> + * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
> + * Written by David Howells (dhowells@...hat.com)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public Licence
> + * as published by the Free Software Foundation; either version
> + * 2 of the Licence, or (at your option) any later version.
> + */
> +
> +#ifndef _ASM_PERF_COUNTER_H
> +#define _ASM_PERF_COUNTER_H
> +
> +#define PERF_COUNTER_INDEX_OFFSET	0

We shouldnt require this of architectures that dont offer hw 
perfcounters yet.


> +
> +#endif /* _ASM_PERF_COUNTER_H */
> diff --git a/arch/frv/lib/Makefile b/arch/frv/lib/Makefile
> index 4ff2fb1..0a37721 100644
> --- a/arch/frv/lib/Makefile
> +++ b/arch/frv/lib/Makefile
> @@ -5,4 +5,4 @@
>  lib-y := \
>  	__ashldi3.o __lshrdi3.o __muldi3.o __ashrdi3.o __negdi2.o __ucmpdi2.o \
>  	checksum.o memcpy.o memset.o atomic-ops.o atomic64-ops.o \
> -	outsl_ns.o outsl_sw.o insl_ns.o insl_sw.o cache.o
> +	outsl_ns.o outsl_sw.o insl_ns.o insl_sw.o cache.o perf_counter.o
> diff --git a/arch/frv/lib/perf_counter.c b/arch/frv/lib/perf_counter.c
> new file mode 100644
> index 0000000..2000fee
> --- /dev/null
> +++ b/arch/frv/lib/perf_counter.c
> @@ -0,0 +1,19 @@
> +/* Performance counter handling
> + *
> + * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
> + * Written by David Howells (dhowells@...hat.com)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public Licence
> + * as published by the Free Software Foundation; either version
> + * 2 of the Licence, or (at your option) any later version.
> + */
> +
> +#include <linux/perf_counter.h>
> +
> +/*
> + * mark the performance counter as pending
> + */
> +void set_perf_counter_pending(void)
> +{
> +}

This could be avoided as well via a generic weak alias.

	Ingo
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