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
Date: Thu, 25 Oct 2012 18:12:49 +0900 [thread overview]
Message-ID: <87zk3a9apa.fsf@sejong.aot.lge.com> (raw)
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")
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
next prev parent reply other threads:[~2012-10-25 9:12 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-24 5:59 [PATCH V2 0/7] perf, x86: Haswell LBR call stack support Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 1/7] perf, x86: Reduce lbr_sel_map size Yan, Zheng
2012-10-24 7:28 ` Stephane Eranian
2012-10-24 7:49 ` Yan, Zheng
2012-10-24 8:15 ` Stephane Eranian
2012-10-24 8:23 ` Yan, Zheng
2012-10-24 8:37 ` Yan, Zheng
2012-10-24 8:53 ` Stephane Eranian
2012-10-24 5:59 ` [PATCH V2 2/7] perf, x86: Basic Haswell LBR call stack support Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 3/7] perf, x86: Introduce x86 special perf event context Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 4/7] perf, x86: Save/resotre LBR stack during context switch Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 5/7] perf, core: Pass perf_sample_data to perf_callchain() Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 6/7] perf, x86: Use LBR call stack to get user callchain Yan, Zheng
2012-10-24 8:57 ` Stephane Eranian
2012-10-24 11:23 ` Yan, Zheng
2012-10-24 11:47 ` Stephane Eranian
2012-10-24 11:52 ` Yan, Zheng
2012-10-24 12:11 ` Stephane Eranian
2012-10-24 12:21 ` Stephane Eranian
2012-10-24 12:31 ` Andi Kleen
2012-10-24 12:36 ` Stephane Eranian
2012-10-24 12:41 ` Andi Kleen
2012-10-24 12:46 ` Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 7/7] perf, x86: Discard zero length call entries in LBR call stack Yan, Zheng
2012-10-25 9:12 ` Namhyung Kim [this message]
2012-10-24 8:49 ` [PATCH V2 0/7] perf, x86: Haswell LBR call stack support Stephane Eranian
-- strict thread matches above, loose matches on Subject: below --
2013-07-01 7:23 [PATCH v2 " Yan, Zheng
2013-07-01 7:23 ` [PATCH v2 7/7] perf, x86: Discard zero length call entries in LBR call stack Yan, Zheng
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