Re: [PATCH 01/14] perf/x86: Introduce PERF_RECORD_OVERHEAD

[Peter Zijlstra]

On Wed, Nov 23, 2016 at 04:44:39AM -0500, kan.li...@intel.com wrote:
> +/*
> + * single overhead record layout:
> + *
> + *    cpu: The cpu which overhead occues

This is duplicate information, its already present in sample_id when
PERF_SAMPLE_CPU, and without that we don't care.

> + *     nr: Times of overhead happens.
> + *         E.g. for NMI, nr == times of NMI handler are called.
> + *   time: Total overhead cost(ns)
> + */
> +struct perf_overhead_entry {
> +     __u32   cpu;
> +     __u64   nr;
> +     __u64   time;
> +};