linux-kernel - Re: [PATCH V2 7/7] perf, x86: Discard zero length call entries in LBR call stack

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Message-ID: <87zk3a9apa.fsf@sejong.aot.lge.com>
Date:	Thu, 25 Oct 2012 18:12:49 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	"Yan\, Zheng" <zheng.z.yan@...el.com>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	eranian@...gle.com, ak@...ux.intel.com
Subject: Re: [PATCH V2 7/7] perf, x86: Discard zero length call entries in LBR call stack

Hi,

On Wed, 24 Oct 2012 13:59:10 +0800, Zheng Yan wrote:
> From: "Yan, Zheng" <zheng.z.yan@...el.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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