Re: dynamic oldmem in kdump kernel

From: AmÃrico Wang
Date: Fri Apr 08 2011 - 06:50:20 EST

On Thu, Apr 7, 2011 at 9:12 PM, Olaf Hering <olaf@xxxxxxxxx> wrote:
> On Thu, Apr 07, AmÃrico Wang wrote:
>> On Thu, Apr 7, 2011 at 5:56 PM, Olaf Hering <olaf@xxxxxxxxx> wrote:
>> > Another issue, slightly related, is memory hotplug.
>> > How is this currently handled for kdump? ÂIs there code which
>> > automatically reconfigures the kdump kernel with the new memory ranges?
>> >
>> No, the crashkernel memory is reserved during boot, and it is static after
>> that (except you can shrink this memory via /sys).
> I meant the overall amount of memory changed by memory hotplug events,
> not the small memory range for the crash kernel itself.
>> Kdump isn't aware of memory hotplug.
> Ok. ÂPerhaps there are hotplug events where a helper script could run
> something like 'rckdump restart'.

That will not work.

You need to change the kernel to let crashkernel memory to be aware
of memory-hotplug, which means you need to re-search for a suitable
memory range in the newly added memory.

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