Re: [RFC PATCH 06/17] perf: Add buffers to the detached events

[Peter Zijlstra]

On Tue, Sep 05, 2017 at 04:30:15PM +0300, Alexander Shishkin wrote:
> @@ -415,6 +416,8 @@ struct perf_event_attr {
>  	__u32	aux_watermark;
>  	__u16	sample_max_stack;
>  	__u16	__reserved_2;	/* align to __u64 */
> +	__u32	detached_nr_pages;
> +	__u32	detached_aux_nr_pages;
>  };

Not sure the naming makes sense; I don't see why this would be limited
to detached events. That is, what would stop someone from pre-allocating
buffers on 'regular' events if they wanted to?