> Here we are assuming that the pre-allocated critical page pool is big enough
> to satisfy the requirements of all the critical sockets.
That seems like a lot of assumptions. Is it really better than the
existing GFP_ATOMIC which works basically the same? It has a lot
more users that compete true, but likely the set of GFP_CRITICAL users
would grow over time too and it would develop the same problem.
I think if you really want to attack this problem and improve
over the GFP_ATOMIC "best effort in smaller pool" approach you should
probably add real reservations. And then really do a lot of testing
to see if it actually helps.
-Andi
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