linux-kernel - Re: [PATCH 1/4] perf tools: Add a test for decoding of new x86 instructions

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Message-ID: <55E55F1E.6030804@intel.com>
Date:	Tue, 01 Sep 2015 11:17:34 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Qiaowei Ren <qiaowei.ren@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/4] perf tools: Add a test for decoding of new x86 instructions

On 01/09/15 03:18, 平松雅巳 / HIRAMATU，MASAMI wrote:
>> From: Adrian Hunter [mailto:adrian.hunter@...el.com]
>>
>> Add a new test titled:
>>
>> 	Test x86 instruction decoder - new instructions
>>
>> The purpose of this test is to check the instruction decoder
>> after new instructions have been added.  Initially, MPX
>> instructions are tested which are already supported, but the
>> definitions in x86-opcode-map.txt will be tweaked in a
>> subsequent patch, after which this test can be run to verify
>> those changes.
> 
> Hmm, btw, why should this test in perf? It seems that we need
> this test in kselftest or build-time selftest.
> I prefer to put this in arch/x86/tools/ or lib/. What would you
> think ?

There are 2 reasons perf tools needs a test:
	1. perf tools is source code independent from the kernel i.e. it has its
own copy of the instruction decoder.
	2. perf tools test also tests the Intel PT decoder's categorization of
instructions.


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