design a custom allocation API

[thestinger]

Ideas to investigate:

• aligned reallocation
• in-place reallocation
  • fail if the operation cannot be performed in-place
  • very useful for some collection and allocator implementations
• batched allocations and deallocations
• sized deallocation
  • avoid reading the slab header in the thread cache fast path
  • if mandatory: avoid headers on large allocations
  • if mandatory: avoid usage of the huge allocation tree
• real size output parameter
• inlined fast path
  • avoid some branches and calculations when size is a constant
  • would cause harmful code bloat if not designed and used carefully