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Nils Goroll authored
The previous implementation used only one BUDDY_REQS, so whenever one segment allocation was fulfilled, other requests with lower priority could "get through" and ultimately lead to bfa_alloc() failing to complete. By using two BUDDY_REQS, we now make sure to "keep out place in the priority queue". We also limit cramming not only by the available bitfield segment slots, but also by a maximum of 4 (1/16th of the requested size) and yield when a lower cram does not succeed to motivate LRU more to make room. This has undergone a _lot_ of testing and has gone through many iterations, which all have been squashed into this commit.
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