deallocate-zeroed

A extension trait for allocators to provide a method for deallocating already-zeroed memory.

Why?

By providing a method for deallocating already-zeroed memory, we allow applications to tell the allocator which free memory is already zeroed. This means that the allocator can often avoid zeroing memory on the allocation critical path, and the zeroing can instead be performed in a background task just before deallocation.

ZeroAwareAllocator

When the zero_aware_allocator cargo feature is enabled, this crate provides a ZeroAwareAllocator type. This is a layered allocator, wrapping an innner allocator and adding the tracking of already-zeroed memory on top of it.

Using Nightly Rust's Unstable feature(allocator_api)

By default, this crate uses the allocator_api2 crate to polyfill nightly Rust's feature(allocator_api). You can instead use the nightly feature(allocator_api) by disabling the allocator_api2 cargo feature and enabling the allocator_api feature. Note that the nightly feature is unstable and may break semver.