Brian Gianforcaro 033b287635 Kernel: Make AsyncDeviceRequest sub-req management alloc free ...

The previous implementation could allocate on insertion into the completed / pending
sub request vectors. There's no reason these can't be intrusive lists instead.

This is a very minor step towards improving the ability to handle OOM, as tracked by #6369
It might also help improve performance on the IO path in certain situations.
I'll benchmark that later.

2021-04-21 19:31:49 +02:00

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