Date: Mon, 27 Jul 2015 16:45:57 +0200
From: Joerg Roedel <joro@8bytes.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Dave Young <dyoung@redhat.com>, Baoquan He <bhe@redhat.com>,
        tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, bp@suse.de,
        akpm@linux-foundation.org, jkosina@suse.cz, vgoyal@redhat.com,
        linux-kernel@vger.kernel.org, yinghai@kernel.org,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH v2] Do not reserve crashkernel high memory if crashkernel
 low memory reserving failed
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 <20150721073123.GA30649@dhcp-129-220.nay.redhat.com>
 <20150721073814.GA17513@gmail.com>
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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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