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From: Andi Kleen <andi@firstfloor.org>
To: Nilay Vaish <nilayvaish@gmail.com>
Cc: Andi Kleen <ak@linux.intel.com>, Andi Kleen <andi@firstfloor.org>,
	acme@kernel.org, jolsa@kernel.org,
	Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/4] perf stat: Add computation of TopDown formulas
Date: Thu, 2 Jun 2016 07:26:10 -0700	[thread overview]
Message-ID: <20160602142610.GD13997@two.firstfloor.org> (raw)
In-Reply-To: <CACbG3083eGXCiUFY_n8+N6s9RMZYbq=p4i617-JViaUHcJ1pSA@mail.gmail.com>

On Thu, Jun 02, 2016 at 06:56:51AM -0500, Nilay Vaish wrote:
> Andi,  I am talking about the if statement.  I don't know why it would
> happen that nothing got measured.  I am guessing you saw it happen.
> May be we can add a comment in the patch that it is possible that all
> counter values are zero and therefore we need that if statement.

Sure it can happen that nothing got measured, for example if the program
didn't run, or the group didn't get scheduled.

-Andi

  reply	other threads:[~2016-06-02 14:26 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-24 19:52 [PATCH 1/4] perf stat: Basic support for TopDown in perf stat Andi Kleen
2016-05-24 19:52 ` [PATCH 2/4] perf stat: Add computation of TopDown formulas Andi Kleen
2016-06-01 14:50   ` Nilay Vaish
2016-06-01 14:56     ` Andi Kleen
2016-06-02 11:56       ` Nilay Vaish
2016-06-02 14:26         ` Andi Kleen [this message]
2016-06-08  8:39   ` [tip:perf/core] " tip-bot for Andi Kleen
2016-05-24 19:52 ` [PATCH 3/4] perf stat: Print topology/time headers with --metric-only Andi Kleen
2016-06-08  8:39   ` [tip:perf/core] " tip-bot for Andi Kleen
2016-05-24 19:52 ` [PATCH 4/4] perf stat: Add missing aggregation headers for --metric-only CSV Andi Kleen
2016-06-08  8:40   ` [tip:perf/core] " tip-bot for Andi Kleen
2016-05-30 16:01 ` [PATCH 1/4] perf stat: Basic support for TopDown in perf stat Arnaldo Carvalho de Melo
2016-05-30 16:04   ` Andi Kleen
2016-05-30 16:19     ` Arnaldo Carvalho de Melo
2016-06-06 14:00       ` Arnaldo Carvalho de Melo
2016-06-06 14:11         ` Arnaldo Carvalho de Melo
2016-06-06 14:36           ` Andi Kleen
2016-06-01 14:24 ` Nilay Vaish
2016-06-01 14:31   ` Andi Kleen
2016-06-01 15:24   ` Andi Kleen
2016-06-02 11:52     ` Nilay Vaish
2016-06-08  8:38 ` [tip:perf/core] " tip-bot for Andi Kleen

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