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Date: Wed, 03 Dec 2014 21:48:19 -0500
From: David Long <dave.long@linaro.org>
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To: William Cohen <wcohen@redhat.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Steve Capper <steve.capper@linaro.org>
CC: "Jon Medhurst (Tixy)" <tixy@linaro.org>,
        Russell King <linux@arm.linux.org.uk>,
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        Sandeepa Prabhu <sandeepa.prabhu@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
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        Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
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	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support
References: <1416292375-29560-1-git-send-email-dave.long@linaro.org> <20141120135851.GA32528@linaro.org> <54759041.9080105@hitachi.com> <20141126100325.GA9157@linaro.org> <5476120D.9030703@linaro.org> <CAPvkgC3eVOZEn79C9PC9c7TqC_-yCtDhw5LL6ZWUJxr+oQFaow@mail.gmail.com> <5476BFB4.2020705@hitachi.com> <CAPvkgC0ELPPWfa-8kQ4H_e_O5G1ER4KEKuSWLxh_u-VZgh7W6A@mail.gmail.com> <547C36DB.7060903@hitachi.com> <547F242D.1060705@redhat.com> <547F94B0.1000902@linaro.org> <547FB5DD.901@redhat.com>
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On 12/03/14 20:16, William Cohen wrote:

[...]

>
> The perf issue seems to be independent and can be reproduced without using any kprobe support.  I need to get a simple reproducer and mention it on the linux-perf-user list.
>
> -Will
>


OK, my confusion came from all the different things perf can use.  I 
have not yet been able to reproduce the "perf stat" failure, but I do 
see the failure with Steve's example using tracepoints.  I had thought 
that was using kprobes, but apparently it just uses tracepoints.  These 
look like two different failures to me:  One related to tracepoints, and 
one in the PMU driver.

Since this seems unrelated to kprobes I don't plan on pursuing these 
particular problems.

-dl