[MODERATED] Re: [PATCH v2 1/8] PERFv2

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Feb 05, 2019 at 05:23:55PM -0800, speck for Andi Kleen wrote:
> From: Andi Kleen <ak@linux.intel.com>
> Subject:  x86/pmu/intel: Export number of counters in caps
> 
> Export the number of generic and fixed counters in the core PMU in caps/
> This helps users and tools with constructing groups. Will be also more
> important with upcoming patches that can change the number of counters.
> 
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>


> ---
>  arch/x86/events/core.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
> index 374a19712e20..58e659bfc2d9 100644
> --- a/arch/x86/events/core.c
> +++ b/arch/x86/events/core.c
> @@ -2248,8 +2248,28 @@ static ssize_t max_precise_show(struct device *cdev,
>  
>  static DEVICE_ATTR_RO(max_precise);
>  
> +static ssize_t num_counter_show(struct device *cdev,
> +				  struct device_attribute *attr,
> +				  char *buf)
> +{
> +	return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu.num_counters);
> +}
> +
> +static DEVICE_ATTR_RO(num_counter);
> +
> +static ssize_t num_counter_fixed_show(struct device *cdev,
> +				  struct device_attribute *attr,
> +				  char *buf)
> +{
> +	return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu.num_counters_fixed);
> +}
> +
> +static DEVICE_ATTR_RO(num_counter_fixed);
> +
>  static struct attribute *x86_pmu_caps_attrs[] = {
>  	&dev_attr_max_precise.attr,
> +	&dev_attr_num_counter.attr,
> +	&dev_attr_num_counter_fixed.attr,
>  	NULL
>  };
>  
> -- 
> 2.17.2