Re: [PATCH 1/1] perf annotate: Fix fallback to unparsed disassembler line

From: Arnaldo Carvalho de Melo
Date: Mon Mar 09 2015 - 09:25:20 EST

Em Mon, Mar 09, 2015 at 12:09:58PM +0100, Ingo Molnar escreveu:
> * Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:
> > [...]
> >
> > Further investigation is needed to figure out the nature of the
> > objdump output change so as to make the parser grok it.
> Btw., maybe someone finds this interesting: we could also (re-)use the
> in-kernel disassembler (on x86 and any other architecture that might
> have one), which used by live patching facilities (kprobes et al).
> See arch/x86/lib/insn.c.
> The 'visualization' bit is missing entirely: but it does a lot of the
> hard work of knowing about the instruction format: it knows about
> essentially all x86 instructions and is able to determine instruction
> boundaries, and can decode immediate constants.
> Using this in tools/perf/ would have the added advantage that we could
> then use the dissasembly in kernel oops output (nice feature!) - plus
> tooling folks would help us fix and extend the kernel's disassembler!
> ;-)

I think it should provide a good synergy, yes, IIRC this was discussed
already at some point even.

- Arnaldo
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