linux-kernel - Re: [PATCH 0/3] Early use of boot service memory

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Message-ID: <20131115062417.GB9237@gmail.com>
Date:	Fri, 15 Nov 2013 07:24:17 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	jerry.hoemann@...com
Cc:	Pekka Enberg <penberg@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	x86 maintainers <x86@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"list@...ederm.org:DOCUMENTATION <linux-doc@...r.kernel.org>,
	list@...ederm.org:MEMORY MANAGEMENT <linux-mm@...ck.org>," 
	<linux-doc@...r.kernel.org>, linux-efi@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Early use of boot service memory


* jerry.hoemann@...com <jerry.hoemann@...com> wrote:

> On Thu, Nov 14, 2013 at 08:44:04PM +0200, Pekka Enberg wrote:
> > On Thu, Nov 14, 2013 at 8:04 PM,  <jerry.hoemann@...com> wrote:
> > > Making this issue a quirk will be a lot more practical.  Its a small, focused
> > > change whose implications are limited and more easily understood.
> > 
> > There's nothing practical with requiring users to pass a kernel option
> > to make kdump work.  It's a workaround, sure, but it's not a proper
> > fix.
> 
> One already has to specify command line arguments to enable kdump. 
> See "crashkernel=" in Documentation/kernel-parameters.txt.

That option is already a usability barrier. Adding yet another 
usability barrier improves things how?

> As i said in an earlier mail we are working w/ distros. [...]

The point being?

> [...]  distros can and do specify lots of interesting command line 
> arguments for their systems.  Distros have tools for configuring 
> kdump. User must already use these tools or manually edit multiple 
> config files, to get kdump to work.  I would work with distros to 
> help integrate this change into their tools.

Here you describe a method that has already successfully cut the kdump 
user base to a fraction of its potential size. Why should we assist to 
that effort of engineered obscurity?

> As i said in earlier mail, i am willing to change implementation to 
> some type of black/white listing.

Is it possible to fix it the way hpa suggested?

Thanks,

	Ingo
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