Writing an OS in Rust: Heap Allocation

Re:Writing an OS in Rust: Heap Allocation by Ericson2314 on Wednesday June 26, 2019 @10:58PM (#20291392)

Phill's blog series is the best there is for kernel Rust. Glad to see another installment!

Note that in Rust today we can only use standard collection with the global allocator. https://github.com/phil-opp/blog_os/blob/post-10/src/main.rs... in the blog post it is intialized, and there's nothing to prevent allocation earlier and that will fail.

But there is work in progress (first https://github.com/rust-lang/rust/pull/58457) that will allow using local allocators, removing the ambient authority that makes that failure possible. Note that this doesn't mean a runtime cost. One can pass around a zero-sized token that is completely erased.

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Re:Writing an OS in Rust: Heap Allocation by phil-opp on Thursday June 27, 2019 @05:51AM (#20293008)

Thanks so much!

Yes, I'm eagerly awaiting https://github.com/rust-lang/rust/pull/58457 and your follow-up https://github.com/rust-lang/rust/pull/60703. AFAIK, a global allocator is still required with them (so we still have to initialize it), but it allows us to choose a different allocator for some collections, e.g. to avoid deadlocks in interrupt handlers.

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