Re: Increasing domain memory beyond initial maxmem

[Juergen Gross <jgross@xxxxxxxx>]

Hi Marek,

On 31.03.22 14:36, Marek Marczykowski-Górecki wrote:
> On Thu, Mar 31, 2022 at 02:22:03PM +0200, Juergen Gross wrote:
> > Maybe some kernel config differences, or other udev rules (memory onlining
> > is done via udev in my guest)?
> >
> > I'm seeing:
> >
> > # zgrep MEMORY_HOTPLUG /proc/config.gz
> > CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
> > CONFIG_MEMORY_HOTPLUG=y
> > # CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE is not set
> > CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
> > CONFIG_XEN_MEMORY_HOTPLUG_LIMIT=512
> I have:
> # zgrep MEMORY_HOTPLUG /proc/config.gz
> CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
> CONFIG_MEMORY_HOTPLUG=y
> CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y
> CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
> CONFIG_XEN_MEMORY_HOTPLUG_LIMIT=512
>
> Not sure if relevant, but I also have:
> CONFIG_XEN_UNPOPULATED_ALLOC=y
>
> on top of that, I have a similar udev rule too:
>
> SUBSYSTEM=="memory", ACTION=="add", ATTR{state}=="offline", ATTR{state}="online"
>
> But I don't think they are conflicting.
>
> > What type of guest are you using? Mine was a PVH guest.
> PVH here too.
Would you like to try the attached patch? It seemed to work for me.


Juergen

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