linux-kernel - Re: [PATCH 17/17] perf annotate: Handle variables in 'sub', 'or' and many other instructions

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Date:   Tue, 17 Apr 2018 09:51:04 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>, Ingo Molnar <mingo@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        David Ahern <dsahern@...il.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Martin Liška <mliska@...e.cz>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Thomas Richter <tmricht@...ux.vnet.ibm.com>,
        Wang Nan <wangnan0@...wei.com>, kernel-team@....com
Subject: Re: [PATCH 17/17] perf annotate: Handle variables in 'sub', 'or' and
 many other instructions

Em Tue, Apr 17, 2018 at 11:56:28AM +0900, Namhyung Kim escreveu:
> Hi,
> 
> On Fri, Apr 13, 2018 at 10:39:40AM -0700, Andi Kleen wrote:
> > > What do I miss? Or where is it that I'm misinterpreting the calculations
> > > that objdump did in its output?
> > 
> > The calculations are right, but these are still two different address modes.
> > You cannot just turn one silently into the other.
> > 
> > I think it would be ok to use the syntax in the assembler
> > 
> > symbol(%rip)  with no # ...
> 
> One thing I find useful is to show string constant if the address is
> in the rodata (and printable of course).  Maybe something like below..
> 
>   lea    0x1234(%rip),%rdi    # "hello world\n"
>   callq  printf
> 
> 
> Just an idea.

Send some more :-)

/me adds to the todo.annotate folder...

- Arnaldo