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 for kexec@lists.infradead.org; Fri, 22 Nov 2013 13:45:19 +0000
Date: Fri, 22 Nov 2013 08:44:49 -0500
From: Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH v4] makedumpfile: Support to filter dump for kernels that
 use CONFIG_SPARSEMEM_VMEMMAP
Message-ID: <20131122134449.GB4046@redhat.com>
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To: Hari Bathini <hbathini@linux.vnet.ibm.com>
Cc: Ken'ichi <oomichi@mxs.nes.nec.co.jp>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Onkar N Mahajan <onmahaja@in.ibm.com>, Kexec-ml <kexec@lists.infradead.org>, Haren Myneni <hbabu@us.ibm.com>, Tachibana-san <tachibana@mxm.nes.nec.co.jp>, Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>, Dave Young <dyoung@redhat.com>

On Fri, Nov 22, 2013 at 06:01:55PM +0530, Hari Bathini wrote:
> Makedumpfile fails to filter dump for kernels build with CONFIG_SPARSEMEM_VMEMMAP
> enabled as it fails to do vmemmap translations. So far, makedumpfile on ppc64 never
> had to deal with vmemmap addresses (vmemmap regions) seperately to filter ppc64
> crash dumps as vmemmap regions where mapped in zone normal. But with the inclusion
> of CONFIG_SPARSEMEM_VMEMMAP config option in recent kernels, vmemmap memory regions
> are mapped outside zone normal. There is a need to handle vmemmap to physical address
> translation seperately in this scenario. This patch provides support in makedumpfile
> tool to do vmemmap to physical address translation when vmemmap regions are mapped
> outside zone normal. Some kernel symbols are needed in vmcoreinfo for this changes to
> be effective. The kernel patch that adds the necessary symbols to vmcoreinfo has been
> posted to linuxppc devel mailing list. This patch is influenced by vmemmap to physical
> address translation support code in crash utility. It is has been tested successfully
> at all dump filtering levels on kernel dumps that have CONFIG_SPARSEMEM_VMEMMAP enabled
> and kernel dumps with CONFIG_SPARSEMEM_VMEMMAP disabled as well. Also, successfully
> tested dump filtering on already filtered vmcores (re-filtering).

Please column width smaller (say 70) for changelogs. This looks messy.

Thanks
Vivek

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