linux-kernel - Re: [PATCH 06/17] perf: Add ability to attach user stack dump to sample

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Message-ID: <20120725163626.GD1173@somewhere.redhat.com>
Date:	Wed, 25 Jul 2012 18:36:28 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, eranian@...gle.com,
	gorcunov@...nvz.org, tzanussi@...il.com, mhiramat@...hat.com,
	robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 06/17] perf: Add ability to attach user stack dump to
 sample

On Sun, Jul 22, 2012 at 02:14:29PM +0200, Jiri Olsa wrote:
> Introducing PERF_SAMPLE_STACK_USER sample type bit to trigger
> the dump of the user level stack on sample. The size of the
> dump is specified by sample_stack_user value.
> 
> Being able to dump parts of the user stack, starting from the
> stack pointer, will be useful to make a post mortem dwarf CFI
> based stack unwinding.
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

If you keep the SOB of the author then you need to preserve its
authorship (git am --author= / git commit --amend --author=).
Unless you changed the patch significantly enough that you
simply credit with something like "Original-patch-by" and you become the
author. This is left to personal appreciation, I won't mind
in any case.

But there is no middle ground :)
You also need to keep the SOB chain in order. The above SOB chain
suggests I'm carrying a patch from you.

Just saying that so that you make the maintainers job easier ;)
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