Re: [Xen-devel] [PATCH] unmodified_drivers: enable use of register_oldmem_pfn_is_ram() API

[Olaf Hering <olaf@xxxxxxxxx>]

On Mon, Apr 04, Jan Beulich wrote:

> From: Mike Meyer <mike.meyer@xxxxxxxxxxxx>
> 
> During the investigation of very slow dump times of guest images in
> Amazon EC2 instance, it was discovered that the
> register_oldmem_pfn_is_ram() API implemented by the upstream kernel
> commit 997c136f518c5debd63847e78e2a8694f56dcf90:
> 
>         fs/proc/vmcore.c: add hook to read_from_oldmem() to check
>                            for non-ram pages
> 
> was not being called.  This was due to the PV driver with the call
> to register_oldmem_pfn_is_ram() API was not including the
> kernel header file that is used to communicate support of the API in the
> kernel.  Fix the issue by including the required header file.
> 
> Signed-off-by: Mike Meyer <mike.meyer@xxxxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Olaf Hering <olaf@xxxxxxxxx>

I'm sure I have tested it at that time, not sure why it used to work a
few years ago.

Olaf

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