linux-kernel - Re: [PATCH] perf/x86: export Sandy Bridge uncore clockticks event in sysfs

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Date:	Thu, 30 Aug 2012 17:11:09 +0800
From:	"Yan, Zheng" <zheng.z.yan@...el.com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	andi@...stfloor.org, mingo@...e.hu
Subject: Re: [PATCH] perf/x86: export Sandy Bridge uncore clockticks event
 in sysfs

On 08/29/2012 09:01 PM, Stephane Eranian wrote:
> 
> This patch exports the clockticks event and its encoding to user level.
> The clockticks event was exported for Nehalem/Westmere but not for Sandy
> Bridge (client). Given that it uses a special encoding, it needs to be
> exported to user tools, so users can do:
> 
>   # perf stat -a -C 0 -e uncore_cbox_0/clockticks/ sleep 1
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>

The Sandy Bridge uncore only contains a few events that are similar to offcore event.
That's why I didn't add any generic event for Sandy Bridge uncore. But thanks anyway.

Acked-by: Yan, Zheng <zheng.z.yan@...el.com>

> ---
> 
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> index 0a55710..38e4894 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> @@ -661,6 +661,11 @@ static void snb_uncore_msr_init_box(struct intel_uncore_box *box)
>  	}
>  }
>  
> +static struct uncore_event_desc snb_uncore_events[] = {
> +	INTEL_UNCORE_EVENT_DESC(clockticks, "event=0xff,umask=0x00"),
> +	{ /* end: all zeroes */ },
> +};
> +
>  static struct attribute *snb_uncore_formats_attr[] = {
>  	&format_attr_event.attr,
>  	&format_attr_umask.attr,
> @@ -704,6 +709,7 @@ static struct intel_uncore_type snb_uncore_cbox = {
>  	.constraints	= snb_uncore_cbox_constraints,
>  	.ops		= &snb_uncore_msr_ops,
>  	.format_group	= &snb_uncore_format_group,
> +	.event_descs	= snb_uncore_events,
>  };
>  
>  static struct intel_uncore_type *snb_msr_uncores[] = {
> 

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