linux-kernel - Re: [PATCH v2] mm: Introduce coredump parameter structure

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Message-ID: <20091202095012.GD22654@elte.hu>
Date:	Wed, 2 Dec 2009 10:50:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, dhowells@...hat.com,
	hidehiro.kawai.ez@...achi.com, lethal@...ux-sh.org,
	roland@...hat.com, vapier@...too.org,
	Takahiro Yasui <tyasui@...hat.com>
Subject: Re: [PATCH v2] mm: Introduce coredump parameter structure


* Masami Hiramatsu <mhiramat@...hat.com> wrote:

> Andrew Morton wrote:
> >On Sat, 28 Nov 2009 23:41:19 -0500
> >Masami Hiramatsu<mhiramat@...hat.com>  wrote:
> >
> >>Introduce coredump parameter data structure (struct coredump_params)
> >>for simplifying binfmt->core_dump() arguments.
> >>
> >>Changes in v2:
> >>    - Don't remove DUMP_WRITE() macro.
> >
> >What is the reason for this change?
> >
> >Please always include both the "what" and the "why" in changelog text.
> 
> I see.

I think Andrew wanted to see a longer explanation about precisely what 
we need for these tracepoints and what the various specific usecases are 
to utilize it.

I.e. a basic cost/benefit analysis is needed. By looking at the patch we 
can see the cost - but you have to counter-balance that with enough 
stuff in the 'benefits' column of the equation.

	Ingo
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