linux-kernel - Re: [PATCH] perf: introduce new two options for objdump.

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Message-ID: <555C85C9.4050104@suse.cz>
Date:	Wed, 20 May 2015 15:02:01 +0200
From:	Martin Liška <mliska@...e.cz>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Ahern <dsahern@...il.com>
CC:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: introduce new two options for objdump.

On 05/19/2015 04:33 PM, Arnaldo Carvalho de Melo wrote:
> Em Tue, May 19, 2015 at 08:29:58AM -0600, David Ahern escreveu:
>> On 5/19/15 8:08 AM, Arnaldo Carvalho de Melo wrote:
>>> Em Thu, Jan 29, 2015 at 02:03:46PM +0100, Martin Liška escreveu:
>>>> Newly introduced options usedfull for off-box usage:
>
>>>     New useful options for off-box usage:
>
>>>>    --objdump-prefix: specify prefix to add to the absolute paths
>>>>    where objdump looks for source files.
>>>>    --objdump-prefix-strip: indicate how many initial directory names
>>>>    to strip off the hardwired absolute paths, passed to objdump.
>>>>    It has no effect without --objdump-prefix.
>
>>> Does this, for instance, allows one looking at source code + assembly
>>> with debuginfo packages? Is that a usecase you tested this against?
>
>>> Anyway, sorry for the delay in processing this, fell thru the cracks ;-\
>
>>> Can you please respin this on top of my current perf/core, at:
>
>>> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
>
>> Perhaps it should be generalized a bit? Right now we have symfs for the
>> location of the tree for binaries. What about a srcfs for a source tree?
>
> That is a good idea indeed.
>
> - Arnaldo
>

Hello.

I was motivated to be able to annotate source code, realized out-of-box. More precisely, on a machine A
I run perf record, I moved the report file to machine B and I use these options to annotate source code.

Let's consider source code location

Machine A:
P1=/a/b/c/d/source-files

Machine B:
P2=/x/y/z/source-files

Using just a single option (--objdump-prefix) works, but one how to place source code on machine B to:
/a/b/c/d/x/y/z/source-files

That's quite cumbersome, thus adding second option, one can strip '/a/b/c/d', with --objdump-prefix-strip=4.
Still, no ideal, but it's quite flexible. A new 'srcfs' can used as --objdump-prefix, am I right?

Respun version of patch is attached.

Thanks,
Martin


View attachment "perf-introduce-new-two-options-for-objump-v2.patch" of type "text/x-patch" (6448 bytes)