Re: [PATCH 2/3] perf/core: introduce pmu_event_flags and PMUEF_READ_CPU_PKG

[Peter Zijlstra]

On Mon, Aug 01, 2016 at 07:44:54PM -0700, David Carrillo-Cisneros wrote:
> +++ b/include/linux/perf_event.h
> @@ -681,9 +681,21 @@ struct perf_event {
>  #endif
>  
>  	struct list_head		sb_list;
> +
> +	/* Per-event flags to generic code set by PMU. */
> +	int				pmu_event_flags;
> +

It appears to me we already have group_flags and attach_state which both
are serialized by ctx->lock.

Could we maybe merge the lot into one flags field?