[kllrnohj]

> allocation of physically contiguous memory allocations (ashmem, dumped now in favor of dmabuff).

ashmem is user space shared memory with permission controls. It was replaced(ish) with memfd with the addition of F_SEAL_FUTURE_WRITE in 5.1 (it took a shockingly long time for that to finally have feature parity but hey better late than never)

ION is the special allocator that was replaced with dmabuf.

Also ARM, qcom, etc... all love playing with the scheduler or making other changes which typically happens downstream first for time-to-market reasons before being upstreamed. eg, ARM's EAS / energy aware scheduling I think actually shipped to users prior to upstream accepting it.