Re: stable-4.18: reliably crash network driver domain by squeezing free_memory

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Mon, Dec 02, 2024 at 03:54:23PM +0000, James Dingwall wrote:
> So there is some undefined range for (free_memory - m) to (free_memory - n)
> where it is possible to crash the driver domain depending on the guest
> startup ordering.  My (perhaps naive) reasoning would be that
> free_memory is the resource available to safely assign without having to
> allow for some unknown overhead and if I do ask for too much then I
> get a 'safe' failure.

FWIW Qubes OS tries to always keep at least 50MB free for Xen. So, our
formula is (free_memory - 50MB).

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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