Commits on Mar 21, 2022

1. LocalAllocator: add alloc_hinted …

   In current implementation, `alloc` expects small allocations are more
   likely, which is likely true for most cases, and puts small allocations
   in the fast path. However, in some scenario, the allocator users may know
   an approximate alloc size in compile time. For example, they may be
   allocating a certein type of objects that may have a typical size, but
   the actual size in runtime may vary; or they may know the least size of
   some objects.
   
   By introducing a method `add_hinted`, we can let users to hint the
   allocator. It accepts a compile-time size hint, based on which a hinted
   fast path is chosen, instead of always favoring small allocations.
   
   Currently, we use the size hint to adjust the fast path only in
   LocalAllocator. Further we can use hint to do more optimizations, like,
   adding `add_range_hinted` for backends, pass the hint from
   LocalAllocator to them, and adjust their fast path to passing the
   allocation to their parent or allocating by their own.

   

   ruihe774 committed Mar 21, 2022
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