Lib.rs

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#memory-allocator #memory #vulkan #allocator #suballocator #tlsf

xalloc

Suballocators for external memory (e.g., Vulkan device memory)

by YVT

9 releases

Uses old Rust 2015

0.2.7 Dec 9, 2020
0.2.6 Feb 28, 2019
0.2.5 Dec 5, 2018
0.2.4 Nov 7, 2018
0.1.0 Oct 27, 2017

#293 in Memory management

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Used in phosphor

MIT license

93KB
2K SLoC

xalloc

docs.rs

Dynamic suballocators for external memory (e.g., Vulkan device memory).

Provided Algorithms

Generic

Name Time Complexity Space Complexity
TLSF (Two-Level Segregated Fit) O(1) O(N + log size)
Free space bitmap O(size) O(size)

Specialized

Name Time Complexity Space Complexity
Ring buffer O(1) O(N)

(size: heap size measured by the number of allocation units, N: number of allocations)

Examples

use xalloc::{SysTlsf, SysTlsfRegion};
let mut tlsf = xalloc::SysTlsf::new(8u32);

// Allocate regions
let alloc1: (SysTlsfRegion, u32) = tlsf.alloc(4).unwrap();
let alloc2: (SysTlsfRegion, u32) = tlsf.alloc(4).unwrap();
let (region1, offset1) = alloc1;
let (region2, offset2) = alloc2;
println!("allocated #1: {:?}", (&region1, offset1));
println!("allocated #2: {:?}", (&region2, offset2));

// Deallocate a region
tlsf.dealloc(region1).unwrap();

// Now we can allocate again
tlsf.alloc(2).unwrap();
tlsf.alloc(2).unwrap();

Feature Flags

  • nightly — Enables optimizations which currently require a Nightly Rust compiler. This flag is now unused due to the stabilization of NonNull in Rust 1.25.

License: MIT

Dependencies

~485KB