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SubjectRe: [PATCH v5 07/12] perf/x86: no counter allocation support
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index 9de8780..ec97a70 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -372,7 +372,8 @@ struct perf_event_attr {
> context_switch : 1, /* context switch data */
> write_backward : 1, /* Write ring buffer from end to beginning */
> namespaces : 1, /* include namespaces data */
> - __reserved_1 : 35;
> + no_counter : 1, /* no counter allocation */

Not sure we really want to expose this in the user ABI. Perhaps make
it a feature of the in kernel API only?

-Andi

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