linux-kernel - Re: [RFC PATCH] perf report: add sort by file lines

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Date:	Fri, 01 Apr 2011 19:48:08 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"2nddept-manager@....hitachi.co.jp" 
	<2nddept-manager@....hitachi.co.jp>
Subject: Re: [RFC PATCH] perf report: add sort by file lines

(2011/03/31 15:57), Lin Ming wrote:
>> So that what we need is a kind of the reverse compiler which generates
>> intermediate code (a sequence of register assignments) from
>> instruction code. That's not impossible task, but just hard and fun. :)
>> For that purpose, we'll need an instruction decoder and an evaluator
>> which allows us to trace the sequence of address dereferences.
> 
> I may borrow code from objdump to decode instruction.
> But not sure about the instruction evaluator, any hints?

I think using objdump is a fast path to make it.
But since we already have a decoder(insn.c) and an evaluator like code (in kvm)
inside the kernel, we'd better reuse it in user space tools too :)

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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