linux-kernel - Re: [PATCH 1/2] kdump: Allow shrinking of kdump region to be overridden

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Message-ID: <20110309142108.GD16951@cr0.redhat.com>
Date:	Wed, 9 Mar 2011 22:21:08 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Mahesh Jagannath Salgaonkar <mahesh@...ux.vnet.ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 1/2] kdump: Allow shrinking of kdump region to be
 overridden

On Wed, Mar 09, 2011 at 11:46:57PM +1100, Anton Blanchard wrote:
>
>Hi,
>
>> The crashkernel region is specified via kernel cmdline, so why
>> not just drop a failure when it overlaps with RMO region?
>> Am I missing something?
>
>Unfortunately a ppc64 kernel requires a chunk of RMO memory. We would
>need the ability to specify multiple crashkernel regions - about 32MB
>in the RMO and the rest can be anywhere. That sounds pretty fragile for
>a user to configure successfully on the cmdline.
>
>Thats why the ppc64 crashkernel region begins mid way through the RMO
>region. It means both kernels get a chunk of RMO and we only have to
>deal with one crashkernel reservation in all the tools and
>documentation.
>

So, when I specify 128M in cmdline, 32M of them are RMO, and the
rest 96M are normal memory? And when I want to free all of them,
actually the 32M RMO will never be freed?

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