linux-kernel - Re: [PATCH 07/12] perf_events: add LBR software filter support for Intel X86

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Date:	Thu, 13 Oct 2011 19:54:39 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, acme@...hat.com,
	ming.m.lin@...el.com, robert.richter@....com, ravitillo@....gov
Subject: Re: [PATCH 07/12] perf_events: add LBR software filter support for
 Intel X86

(2011/10/12 16:06), Ingo Molnar wrote:
> 
> * Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
> 
>> (2011/10/10 23:45), Andi Kleen wrote:
>>>> Ah, nice. Maybe we need another test binary, since current one is
>>>> just ensuring the output of objdump and decoder is same.
>>>> anyway it's not so difficult if it feeds random binaries to
>>>> ensure the decoder doesn't access bad address.
>>>
>>> Pure /dev/urandom is not good because it cannot be ever reproduced.
>>> Better use a PRNG with random seed from urandom, but print the seed.
>>
>> Sure,
> 
> Obviously the urandom data should be kbuild generated and only 
> cleared on 'make clean' - not regenerated on every run. So if there's 
> a failure the failing urandom data stays around readily.

I've added options for passing a combination of seed and seqno
or instruction sequence directly. So if someone find an error
message, they can easily reproduce it or report it.

Thank you,

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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