waynexia commented on PR #6336:
URL: https://github.com/apache/arrow-rs/pull/6336#issuecomment-2324207844

   Thanks for reviewing @alamb. I've created a new example `allocator_api.rs` 
under `examples/`, and a paragraph in the doc comment of `MutableBuffer` that 
describes the usage and links to the example.
   
   > For example to create a MutableBuffer with a custom allocator and report 
on the allocations performed or something.
   
   I tried to use [`unkai`](https://crates.io/crates/unkai) at first to demo 
the ability to track memory usage but then I realized I can't add an optional 
`dev-dependence`. An unconditional dep to `unkai` will break other examples 
without a nightly toolchain. So the example only uses `Global`. (maybe I should 
add a similar feature gate to `unkai`?)


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