linux-kernel - Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support

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Message-ID: <547FCB73.1010707@linaro.org>
Date:	Wed, 03 Dec 2014 21:48:19 -0500
From:	David Long <dave.long@...aro.org>
To:	William Cohen <wcohen@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Steve Capper <steve.capper@...aro.org>
CC:	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	David Miller <davem@...emloft.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support

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

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