linux-kernel - Re: [PATCH 2/4] perf stat: Add computation of TopDown formulas

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Message-ID: <CACbG30_qs_LNmoG9EQCBEBq=HbBjPxP98ABKvmGht+Y_sbTTXA@mail.gmail.com>
Date:	Wed, 1 Jun 2016 09:50:07 -0500
From:	Nilay Vaish <nilayvaish@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/4] perf stat: Add computation of TopDown formulas

On 24 May 2016 at 14:52, Andi Kleen <andi@...stfloor.org> wrote:
> +static double td_be_bound(int ctx, int cpu)
> +{
> +       double sum = (td_fe_bound(ctx, cpu) +
> +                     td_bad_spec(ctx, cpu) +
> +                     td_retiring(ctx, cpu));
> +       if (sum == 0)
> +               return 0;
> +       return sanitize_val(1.0 - sum);
> +}
> +

Can you explain why we need the check on sum?

--
Nilay