On Mon, 19 Aug 2024 at 13:24, David Hildenbrand <david@xxxxxxxxxx> wrote:
>
> Right, "warn + loop forever" is one alternative where you could at least
> keep the system alive to some degree.
Maybe. Or it might just lock up the machine.
For small allocations looping forever is probably fine, because in
practice there's always *something* that can be thrown out.
But anything larger than order-3 (handwavy, but that was our
historical limit, I think, and we call it PAGE_ALLOC_COSTLY_ORDER) has
to fail at _some_ point, and the caller setting GFP_NOFAIL is just
fantasy and "Daddy, I want a pony", and should be ignored.
With a WARN_ON_ONCE(), by all means, so that people can see who the
fantasist is.
Linus
