From: Namhyung Kim <namhyung@kernel.org>
To: "Yan\, Zheng" <zheng.z.yan@intel.com>
Cc: linux-kernel@vger.kernel.org, a.p.zijlstra@chello.nl, eranian@google.com,
        ak@linux.intel.com
Subject: Re: [PATCH V2 7/7] perf, x86: Discard zero length call entries in LBR call stack
References: <1351058350-9159-1-git-send-email-zheng.z.yan@intel.com>
	<1351058350-9159-8-git-send-email-zheng.z.yan@intel.com>
Date: Thu, 25 Oct 2012 18:12:49 +0900
In-Reply-To: <1351058350-9159-8-git-send-email-zheng.z.yan@intel.com> (Zheng
	Yan's message of "Wed, 24 Oct 2012 13:59:10 +0800")
Message-ID: <87zk3a9apa.fsf@sejong.aot.lge.com>
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Hi,

On Wed, 24 Oct 2012 13:59:10 +0800, Zheng Yan wrote:
> From: "Yan, Zheng" <zheng.z.yan@intel.com>
>
> Zero length calls may confuse the hardware and make the recorded
> call stack incorrect. Try fixing the call stack by discarding
> zero length call entries.

It would be great adding an explanation what is the "zero length call"
and why it makes a confusion.

Thanks,
Namhyung
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