First of all, allocate 64KiB aligned memory regions for slab and buddy allocators.
#![feature(start)]
use memac;
use libc::{posix_memalign, c_void};
#[global_allocator]
static mut ALLOC: memac::Allocator<memac::budyy::Buddy32M> = memac::Allocator::new();
fn main() {
println!("Hello, world!");
}
const HEAP_SIZE: usize = 32 * 1024 * 1024; // 32MiB
#[start]
fn start(_argc: isize, _argv: *const *const u8) -> isize {
// initialize memory
unsafe {
// allocate memory
let mut ptr: *mut c_void = std::ptr::null_mut();
if posix_memalign(&mut ptr, memac::ALIGNMENT, HEAP_SIZE) != 0 {
panic!("posix_memalign");
}
ALLOC.init(ptr as usize, HEAP_SIZE);
}
main();
0
}[dependencies]
libc = "0.2"
memac = "0.5"memac::Allocator<memac::budyy::Buddy32M> means that
the slab allocator uses the buddy allocator to allocate slabs.
If a requested size is greater than (65512 - 8) bytes,
the buddy allocator is used to allocate memory.
memac::Allocator<memac::pager::PageManager> means that
the allocator uses the page manager to allocate slabs.
If a requested size is greater than (65512 - 8) bytes,
the page manager is used to allocate memory.
If a requested size is greater that 64K bytes,
the allocation will fail.