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Message-ID: <20150727144557.GP10969@8bytes.org>
Date:	Mon, 27 Jul 2015 16:45:57 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, bp@...e.de,
	akpm@...ux-foundation.org, jkosina@...e.cz, vgoyal@...hat.com,
	linux-kernel@...r.kernel.org, yinghai@...nel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH v2] Do not reserve crashkernel high memory if crashkernel
 low memory reserving failed

On Tue, Jul 21, 2015 at 09:38:14AM +0200, Ingo Molnar wrote:
> Also, why was this syntax introduced in the first place? Why should the user 
> care??
> 
> We should only have a single crashkernel option, to enable it - and everything 
> else should be figured out by the kernel, automatically.
> 
> Any other sub-options just paper over some fragility elsewhere and make the 
> feature harder to use, hence more fragile.

Hmm, maybe the reason is that old userspace (kdump/kexec tools) can't
deal with crashkernel loaded high, so that the default for
crashkernel=size allocations was kept to be under 896MB.

If that's not an issue we can change the default and get rid of the
,high and ,low syntax.


	Joerg

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