linux-kernel - Re: [PATCH 1/2 -tip] perf_counter: Add generalized hardware vectored co-processor support for AMD and Intel Corei7/Nehalem

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Date:	Fri, 03 Jul 2009 13:08:56 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Anton Blanchard <anton@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 1/2 -tip] perf_counter: Add generalized hardware
 vectored co-processor support for AMD and Intel Corei7/Nehalem

Hello Ingo,

On Thu, 2009-07-02 at 15:14 +0530, Jaswinder Singh Rajput wrote:
> This output is from AMD box:
> 
> $ ./perf stat -e add -e multiply -e divide -e vec-idle-cycles -e vec-stall-cycles -e vec-ops -- ls -lR /usr/include/ > /dev/null
> 
>  Performance counter stats for 'ls -lR /usr/include/':
> 
>            4218  vec-adds                  (scaled from 66.60%)
>            7426  vec-muls                  (scaled from 66.67%)
>            5441  vec-divs                  (scaled from 66.29%)
>       821982187  vec-idle-cycles           (scaled from 66.45%)
>            2681  vec-stall-cycles          (scaled from 67.11%)
>            7887  vec-ops                   (scaled from 66.88%)
> 
>     0.417614573  seconds time elapsed
> 
> $ ./perf stat -e add -e multiply -e divide -e vec-idle-cycles -e vec-stall-cycles -e vec-ops -- /usr/bin/rhythmbox ~jaswinder/Music/singhiskinng.mp3
> 
>  Performance counter stats for '/usr/bin/rhythmbox /home/jaswinder/Music/singhiskinng.mp3':
> 
>        17552264  vec-adds                  (scaled from 66.28%)
>        19715258  vec-muls                  (scaled from 66.63%)
>        15862733  vec-divs                  (scaled from 66.82%)
>     23735187095  vec-idle-cycles           (scaled from 66.89%)
>        11353159  vec-stall-cycles          (scaled from 66.90%)
>        36628571  vec-ops                   (scaled from 66.48%)
> 
>   298.350012843  seconds time elapsed
> 
> $ ./perf stat -e add -e multiply -e divide -e vec-idle-cycles -e vec-stall-cycles -e vec-ops -- /usr/bin/vlc ~jaswinder/Videos/Linus_Torvalds_interview_with_Charlie_Rose_Part_1.flv
> 
>  Performance counter stats for '/usr/bin/vlc /home/jaswinder/Videos/Linus_Torvalds_interview_with_Charlie_Rose_Part_1.flv':
> 
>     20177177044  vec-adds                  (scaled from 66.63%)
>     34101687027  vec-muls                  (scaled from 66.64%)
>      3984060862  vec-divs                  (scaled from 66.71%)
>     26349684710  vec-idle-cycles           (scaled from 66.65%)
>      9052001905  vec-stall-cycles          (scaled from 66.66%)
>     76440734242  vec-ops                   (scaled from 66.71%)
> 
>   272.523058097  seconds time elapsed
> 
> $ ./perf list shows vector events like :
> 
>   vec-adds OR add                          [Hardware vector event]
>   vec-muls OR multiply                     [Hardware vector event]
>   vec-divs OR divide                       [Hardware vector event]
>   vec-idle-cycles OR vec-empty-cycles      [Hardware vector event]
>   vec-stall-cycles OR vec-busy-cycles      [Hardware vector event]
>   vec-ops OR vec-operations                [Hardware vector event]
> 
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> ---
>  arch/x86/kernel/cpu/perf_counter.c |   45 +++++++++++++++++++++++++++++
>  include/linux/perf_counter.h       |   15 ++++++++++
>  kernel/perf_counter.c              |    1 +
>  tools/perf/util/parse-events.c     |   55 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 116 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
> index 36c3dc7..48f28b7 100644
> --- a/arch/x86/kernel/cpu/perf_counter.c
> +++ b/arch/x86/kernel/cpu/perf_counter.c
> @@ -372,6 +372,22 @@ static const u64 atom_hw_cache_event_ids
>   },
>  };
>  
> +/*
> + * Generalized hw vectored co-processor event table
> + */
> +
> +static u64 __read_mostly hw_vector_event_ids[PERF_COUNT_HW_VECTOR_MAX];
> +
> +static const u64 nehalem_hw_vector_event_ids[] =
> +{
> +  [PERF_COUNT_HW_VECTOR_ADD]		= 0x01B1, /* UOPS_EXECUTED.PORT0     */
> +  [PERF_COUNT_HW_VECTOR_MULTIPLY]	= 0x0214, /* ARITH.MUL               */
> +  [PERF_COUNT_HW_VECTOR_DIVIDE]		= 0x0114, /* ARITH.CYCLES_DIV_BUSY   */
> +  [PERF_COUNT_HW_VECTOR_IDLE_CYCLES]	= 0x0,
> +  [PERF_COUNT_HW_VECTOR_STALL_CYCLES]	= 0x60A2, /* RESOURCE_STALLS.FPCW|MXCSR*/
> +  [PERF_COUNT_HW_VECTOR_OPS]		= 0x0710, /* FP_COMP_OPS_EXE.X87|MMX|SSE_FP*/
> +};
> +

Have you tested this patch on Intel Corei7/Nehalem.

Thanks,
--
JSR

http://userweb.kernel.org/~jaswinder/



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