linux-kernel - Re: [PATCH V2 03/13] perf/x86: output sampling overhead

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Message-ID: <20161206113805.GO3124@twins.programming.kicks-ass.net>
Date:   Tue, 6 Dec 2016 12:38:05 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...el.com
Cc:     mingo@...hat.com, acme@...nel.org, linux-kernel@...r.kernel.org,
        alexander.shishkin@...ux.intel.com, tglx@...utronix.de,
        namhyung@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
        wangnan0@...wei.com, mark.rutland@....com, andi@...stfloor.org
Subject: Re: [PATCH V2 03/13] perf/x86: output sampling overhead

On Fri, Dec 02, 2016 at 04:19:11PM -0500, kan.liang@...el.com wrote:
> +static void
> +perf_calculate_nmi_overhead(u64 time)
> +{
> +	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
> +
> +	cpuc->nmi_overhead.nr++;
> +	cpuc->nmi_overhead.time += time;
> +}

This function doesn't calculate anything much.