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Add Suballocator::suballocations (#2499)
* Add `Suballocator::suballocations` * Add missing `Send` and `Sync` impls for `free_list::Suballocations` * Missed docs * Strange import, what is rust-analyzer smoking
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marc0246
GitHub
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984cbeb0c3
@ -1,4 +1,6 @@
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use super::{AllocationType, Region, Suballocation, Suballocator, SuballocatorError};
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use super::{
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AllocationType, Region, Suballocation, SuballocationNode, Suballocator, SuballocatorError,
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};
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use crate::{
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memory::{
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allocator::{align_up, array_vec::ArrayVec, AllocationHandle, DeviceLayout},
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@ -6,10 +8,7 @@ use crate::{
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},
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DeviceSize, NonZeroDeviceSize,
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};
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use std::{
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cell::{Cell, UnsafeCell},
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cmp,
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};
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use std::cmp;
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/// A [suballocator] whose structure forms a binary tree of power-of-two-sized suballocations.
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///
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@ -62,8 +61,11 @@ use std::{
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pub struct BuddyAllocator {
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region_offset: DeviceSize,
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// Total memory remaining in the region.
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free_size: Cell<DeviceSize>,
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state: UnsafeCell<BuddyAllocatorState>,
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free_size: DeviceSize,
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// Every order has its own free-list for convenience, so that we don't have to traverse a tree.
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// Each free-list is sorted by offset because we want to find the first-fit as this strategy
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// minimizes external fragmentation.
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free_list: ArrayVec<Vec<DeviceSize>, { Self::MAX_ORDERS }>,
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}
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impl BuddyAllocator {
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@ -75,6 +77,8 @@ impl BuddyAllocator {
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}
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unsafe impl Suballocator for BuddyAllocator {
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type Suballocations<'a> = std::iter::Empty<SuballocationNode>;
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/// Creates a new `BuddyAllocator` for the given [region].
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///
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/// # Panics
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@ -93,24 +97,21 @@ unsafe impl Suballocator for BuddyAllocator {
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assert!(max_order < BuddyAllocator::MAX_ORDERS);
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let free_size = Cell::new(region.size());
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let mut free_list =
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ArrayVec::new(max_order + 1, [EMPTY_FREE_LIST; BuddyAllocator::MAX_ORDERS]);
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// The root node has the lowest offset and highest order, so it's the whole region.
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free_list[max_order].push(region.offset());
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let state = UnsafeCell::new(BuddyAllocatorState { free_list });
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BuddyAllocator {
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region_offset: region.offset(),
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free_size,
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state,
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free_size: region.size(),
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free_list,
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}
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}
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#[inline]
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fn allocate(
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&self,
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&mut self,
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layout: DeviceLayout,
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allocation_type: AllocationType,
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buffer_image_granularity: DeviceAlignment,
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@ -150,17 +151,16 @@ unsafe impl Suballocator for BuddyAllocator {
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let size = cmp::max(size, BuddyAllocator::MIN_NODE_SIZE).next_power_of_two();
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let min_order = (size / BuddyAllocator::MIN_NODE_SIZE).trailing_zeros() as usize;
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let state = unsafe { &mut *self.state.get() };
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// Start searching at the lowest possible order going up.
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for (order, free_list) in state.free_list.iter_mut().enumerate().skip(min_order) {
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for (order, free_list) in self.free_list.iter_mut().enumerate().skip(min_order) {
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for (index, &offset) in free_list.iter().enumerate() {
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if is_aligned(offset, alignment) {
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free_list.remove(index);
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// Go in the opposite direction, splitting nodes from higher orders. The lowest
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// order doesn't need any splitting.
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for (order, free_list) in state
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for (order, free_list) in self
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.free_list
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.iter_mut()
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.enumerate()
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@ -185,7 +185,7 @@ unsafe impl Suballocator for BuddyAllocator {
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// This can't overflow because suballocation sizes in the free-list are
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// constrained by the remaining size of the region.
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self.free_size.set(self.free_size.get() - size);
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self.free_size -= size;
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return Ok(Suballocation {
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offset,
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@ -206,17 +206,16 @@ unsafe impl Suballocator for BuddyAllocator {
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}
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#[inline]
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unsafe fn deallocate(&self, suballocation: Suballocation) {
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unsafe fn deallocate(&mut self, suballocation: Suballocation) {
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let mut offset = suballocation.offset;
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let order = suballocation.handle.as_index();
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let min_order = order;
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let state = unsafe { &mut *self.state.get() };
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debug_assert!(!state.free_list[order].contains(&offset));
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debug_assert!(!self.free_list[order].contains(&offset));
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// Try to coalesce nodes while incrementing the order.
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for (order, free_list) in state.free_list.iter_mut().enumerate().skip(min_order) {
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for (order, free_list) in self.free_list.iter_mut().enumerate().skip(min_order) {
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// This can't discard any bits because `order` is confined to the range
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// [0, log(region.size / BuddyAllocator::MIN_NODE_SIZE)].
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let size = BuddyAllocator::MIN_NODE_SIZE << order;
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@ -241,7 +240,7 @@ unsafe impl Suballocator for BuddyAllocator {
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// The sizes of suballocations allocated by `self` are constrained by that of
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// its region, so they can't possibly overflow when added up.
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self.free_size.set(self.free_size.get() + size);
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self.free_size += size;
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break;
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}
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@ -256,17 +255,14 @@ unsafe impl Suballocator for BuddyAllocator {
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/// [internal fragmentation]: super#internal-fragmentation
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#[inline]
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fn free_size(&self) -> DeviceSize {
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self.free_size.get()
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self.free_size
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}
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#[inline]
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fn cleanup(&mut self) {}
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}
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#[derive(Debug)]
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struct BuddyAllocatorState {
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// Every order has its own free-list for convenience, so that we don't have to traverse a tree.
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// Each free-list is sorted by offset because we want to find the first-fit as this strategy
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// minimizes external fragmentation.
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free_list: ArrayVec<Vec<DeviceSize>, { BuddyAllocator::MAX_ORDERS }>,
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#[inline]
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fn suballocations(&self) -> Self::Suballocations<'_> {
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todo!()
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}
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}
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@ -1,14 +1,15 @@
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use super::{AllocationType, Region, Suballocation, Suballocator, SuballocatorError};
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use super::{
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are_blocks_on_same_page, AllocationType, Region, Suballocation, SuballocationNode,
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SuballocationType, Suballocator, SuballocatorError,
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};
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use crate::{
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memory::{
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allocator::{
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align_up, suballocator::are_blocks_on_same_page, AllocationHandle, DeviceLayout,
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},
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allocator::{align_up, AllocationHandle, DeviceLayout},
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DeviceAlignment,
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},
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DeviceSize,
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};
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use std::cell::Cell;
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use std::iter::FusedIterator;
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/// A [suballocator] which can allocate dynamically, but can only free all allocations at once.
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///
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@ -53,8 +54,8 @@ use std::cell::Cell;
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#[derive(Debug)]
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pub struct BumpAllocator {
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region: Region,
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free_start: Cell<DeviceSize>,
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prev_allocation_type: Cell<AllocationType>,
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free_start: DeviceSize,
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prev_allocation_type: AllocationType,
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}
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impl BumpAllocator {
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@ -63,26 +64,46 @@ impl BumpAllocator {
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/// [region]: Suballocator#regions
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#[inline]
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pub fn reset(&mut self) {
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*self.free_start.get_mut() = 0;
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*self.prev_allocation_type.get_mut() = AllocationType::Unknown;
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self.free_start = 0;
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self.prev_allocation_type = AllocationType::Unknown;
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}
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fn suballocation_node(&self, part: usize) -> SuballocationNode {
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if part == 0 {
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SuballocationNode {
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offset: self.region.offset(),
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size: self.free_start,
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allocation_type: self.prev_allocation_type.into(),
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}
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} else {
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debug_assert_eq!(part, 1);
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SuballocationNode {
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offset: self.region.offset() + self.free_start,
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size: self.free_size(),
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allocation_type: SuballocationType::Free,
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}
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}
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}
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}
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unsafe impl Suballocator for BumpAllocator {
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type Suballocations<'a> = Suballocations<'a>;
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/// Creates a new `BumpAllocator` for the given [region].
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///
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/// [region]: Suballocator#regions
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fn new(region: Region) -> Self {
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BumpAllocator {
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region,
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free_start: Cell::new(0),
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prev_allocation_type: Cell::new(AllocationType::Unknown),
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free_start: 0,
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prev_allocation_type: AllocationType::Unknown,
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}
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}
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#[inline]
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fn allocate(
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&self,
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&mut self,
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layout: DeviceLayout,
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allocation_type: AllocationType,
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buffer_image_granularity: DeviceAlignment,
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@ -96,13 +117,13 @@ unsafe impl Suballocator for BumpAllocator {
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// These can't overflow because suballocation offsets are bounded by the region, whose end
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// can itself not exceed `DeviceLayout::MAX_SIZE`.
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let prev_end = self.region.offset() + self.free_start.get();
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let prev_end = self.region.offset() + self.free_start;
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let mut offset = align_up(prev_end, alignment);
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if buffer_image_granularity != DeviceAlignment::MIN
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&& prev_end > 0
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&& are_blocks_on_same_page(0, prev_end, offset, buffer_image_granularity)
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&& has_granularity_conflict(self.prev_allocation_type.get(), allocation_type)
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&& has_granularity_conflict(self.prev_allocation_type, allocation_type)
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{
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offset = align_up(offset, buffer_image_granularity);
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}
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@ -115,8 +136,8 @@ unsafe impl Suballocator for BumpAllocator {
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return Err(SuballocatorError::OutOfRegionMemory);
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}
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self.free_start.set(free_start);
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self.prev_allocation_type.set(allocation_type);
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self.free_start = free_start;
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self.prev_allocation_type = allocation_type;
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Ok(Suballocation {
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offset,
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@ -127,17 +148,91 @@ unsafe impl Suballocator for BumpAllocator {
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}
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#[inline]
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unsafe fn deallocate(&self, _suballocation: Suballocation) {
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unsafe fn deallocate(&mut self, _suballocation: Suballocation) {
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// such complex, very wow
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}
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#[inline]
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fn free_size(&self) -> DeviceSize {
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self.region.size() - self.free_start.get()
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self.region.size() - self.free_start
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}
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#[inline]
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fn cleanup(&mut self) {
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self.reset();
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}
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#[inline]
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fn suballocations(&self) -> Self::Suballocations<'_> {
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let start = if self.free_start == 0 { 1 } else { 0 };
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let end = if self.free_start == self.region.size() {
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1
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} else {
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2
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};
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Suballocations {
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allocator: self,
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start,
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end,
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}
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}
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}
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#[derive(Clone)]
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pub struct Suballocations<'a> {
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allocator: &'a BumpAllocator,
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start: usize,
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end: usize,
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}
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impl Iterator for Suballocations<'_> {
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type Item = SuballocationNode;
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#[inline]
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fn next(&mut self) -> Option<Self::Item> {
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if self.len() != 0 {
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let node = self.allocator.suballocation_node(self.start);
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self.start += 1;
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Some(node)
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} else {
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None
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}
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}
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#[inline]
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fn size_hint(&self) -> (usize, Option<usize>) {
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let len = self.len();
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(len, Some(len))
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}
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#[inline]
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fn last(mut self) -> Option<Self::Item> {
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self.next_back()
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}
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}
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impl DoubleEndedIterator for Suballocations<'_> {
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#[inline]
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fn next_back(&mut self) -> Option<Self::Item> {
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if self.len() != 0 {
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self.end -= 1;
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let node = self.allocator.suballocation_node(self.end);
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Some(node)
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} else {
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None
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}
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}
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}
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impl ExactSizeIterator for Suballocations<'_> {
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#[inline]
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fn len(&self) -> usize {
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self.end - self.start
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}
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}
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impl FusedIterator for Suballocations<'_> {}
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@ -1,18 +1,15 @@
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use super::{AllocationType, Region, Suballocation, Suballocator, SuballocatorError};
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use super::{
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are_blocks_on_same_page, AllocationType, Region, Suballocation, SuballocationNode,
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SuballocationType, Suballocator, SuballocatorError,
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};
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use crate::{
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memory::{
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allocator::{
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align_up, suballocator::are_blocks_on_same_page, AllocationHandle, DeviceLayout,
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},
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allocator::{align_up, AllocationHandle, DeviceLayout},
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is_aligned, DeviceAlignment,
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},
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DeviceSize,
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};
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use std::{
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cell::{Cell, UnsafeCell},
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cmp,
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ptr::NonNull,
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};
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use std::{cmp, iter::FusedIterator, marker::PhantomData, ptr::NonNull};
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/// A [suballocator] that uses the most generic [free-list].
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///
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@ -65,47 +62,49 @@ use std::{
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pub struct FreeListAllocator {
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region_offset: DeviceSize,
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// Total memory remaining in the region.
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free_size: Cell<DeviceSize>,
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state: UnsafeCell<FreeListAllocatorState>,
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free_size: DeviceSize,
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suballocations: SuballocationList,
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}
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unsafe impl Send for FreeListAllocator {}
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unsafe impl Suballocator for FreeListAllocator {
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type Suballocations<'a> = Suballocations<'a>;
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/// Creates a new `FreeListAllocator` for the given [region].
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///
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/// [region]: Suballocator#regions
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fn new(region: Region) -> Self {
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let free_size = Cell::new(region.size());
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let node_allocator = slabbin::SlabAllocator::<SuballocationListNode>::new(32);
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let mut free_list = Vec::with_capacity(32);
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let root_ptr = node_allocator.allocate();
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let root = SuballocationListNode {
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prev: None,
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next: None,
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offset: region.offset(),
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size: region.size(),
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ty: SuballocationType::Free,
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allocation_type: SuballocationType::Free,
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};
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unsafe { root_ptr.as_ptr().write(root) };
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let mut free_list = Vec::with_capacity(32);
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free_list.push(root_ptr);
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let state = UnsafeCell::new(FreeListAllocatorState {
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node_allocator,
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let suballocations = SuballocationList {
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head: root_ptr,
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tail: root_ptr,
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len: 1,
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free_list,
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});
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node_allocator,
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};
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FreeListAllocator {
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region_offset: region.offset(),
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free_size,
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state,
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free_size: region.size(),
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suballocations,
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}
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}
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#[inline]
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fn allocate(
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&self,
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&mut self,
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layout: DeviceLayout,
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allocation_type: AllocationType,
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buffer_image_granularity: DeviceAlignment,
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@ -122,9 +121,8 @@ unsafe impl Suballocator for FreeListAllocator {
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let size = layout.size();
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let alignment = layout.alignment();
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let state = unsafe { &mut *self.state.get() };
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match state.free_list.last() {
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match self.suballocations.free_list.last() {
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Some(&last) if unsafe { (*last.as_ptr()).size } >= size => {
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// We create a dummy node to compare against in the below binary search. The only
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// fields of importance are `offset` and `size`. It is paramount that we set
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@ -136,7 +134,7 @@ unsafe impl Suballocator for FreeListAllocator {
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next: None,
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offset: 0,
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size,
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ty: SuballocationType::Unknown,
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allocation_type: SuballocationType::Unknown,
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};
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// This is almost exclusively going to return `Err`, but that's expected: we are
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@ -149,11 +147,14 @@ unsafe impl Suballocator for FreeListAllocator {
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//
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// Note that `index == free_list.len()` can't be because we checked that the
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// free-list contains a suballocation that is big enough.
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let (Ok(index) | Err(index)) = state
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let (Ok(index) | Err(index)) = self
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.suballocations
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.free_list
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.binary_search_by_key(&dummy_node, |&ptr| unsafe { *ptr.as_ptr() });
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|
||||
for (index, &node_ptr) in state.free_list.iter().enumerate().skip(index) {
|
||||
for (index, &node_ptr) in
|
||||
self.suballocations.free_list.iter().enumerate().skip(index)
|
||||
{
|
||||
let node = unsafe { *node_ptr.as_ptr() };
|
||||
|
||||
// This can't overflow because suballocation offsets are bounded by the region,
|
||||
@ -171,7 +172,7 @@ unsafe impl Suballocator for FreeListAllocator {
|
||||
prev.size,
|
||||
offset,
|
||||
buffer_image_granularity,
|
||||
) && has_granularity_conflict(prev.ty, allocation_type)
|
||||
) && has_granularity_conflict(prev.allocation_type, allocation_type)
|
||||
{
|
||||
// This is overflow-safe for the same reason as above.
|
||||
offset = align_up(offset, buffer_image_granularity);
|
||||
@ -187,19 +188,19 @@ unsafe impl Suballocator for FreeListAllocator {
|
||||
//
|
||||
// `node.offset + node.size` can't overflow for the same reason as above.
|
||||
if offset + size <= node.offset + node.size {
|
||||
state.free_list.remove(index);
|
||||
self.suballocations.free_list.remove(index);
|
||||
|
||||
// SAFETY:
|
||||
// - `node` is free.
|
||||
// - `offset` is that of `node`, possibly rounded up.
|
||||
// - We checked that `offset + size` falls within `node`.
|
||||
unsafe { state.split(node_ptr, offset, size) };
|
||||
unsafe { self.suballocations.split(node_ptr, offset, size) };
|
||||
|
||||
unsafe { (*node_ptr.as_ptr()).ty = allocation_type.into() };
|
||||
unsafe { (*node_ptr.as_ptr()).allocation_type = allocation_type.into() };
|
||||
|
||||
// This can't overflow because suballocation sizes in the free-list are
|
||||
// constrained by the remaining size of the region.
|
||||
self.free_size.set(self.free_size.get() - size);
|
||||
self.free_size -= size;
|
||||
|
||||
return Ok(Suballocation {
|
||||
offset,
|
||||
@ -223,7 +224,7 @@ unsafe impl Suballocator for FreeListAllocator {
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn deallocate(&self, suballocation: Suballocation) {
|
||||
unsafe fn deallocate(&mut self, suballocation: Suballocation) {
|
||||
let node_ptr = suballocation
|
||||
.handle
|
||||
.as_ptr()
|
||||
@ -235,44 +236,53 @@ unsafe impl Suballocator for FreeListAllocator {
|
||||
let node_ptr = unsafe { NonNull::new_unchecked(node_ptr) };
|
||||
let node = unsafe { *node_ptr.as_ptr() };
|
||||
|
||||
debug_assert!(node.ty != SuballocationType::Free);
|
||||
debug_assert_ne!(node.allocation_type, SuballocationType::Free);
|
||||
|
||||
// Suballocation sizes are constrained by the size of the region, so they can't possibly
|
||||
// overflow when added up.
|
||||
self.free_size.set(self.free_size.get() + node.size);
|
||||
self.free_size += node.size;
|
||||
|
||||
unsafe { (*node_ptr.as_ptr()).ty = SuballocationType::Free };
|
||||
unsafe { (*node_ptr.as_ptr()).allocation_type = SuballocationType::Free };
|
||||
|
||||
let state = unsafe { &mut *self.state.get() };
|
||||
|
||||
unsafe { state.coalesce(node_ptr) };
|
||||
unsafe { state.deallocate(node_ptr) };
|
||||
unsafe { self.suballocations.coalesce(node_ptr) };
|
||||
unsafe { self.suballocations.deallocate(node_ptr) };
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn free_size(&self) -> DeviceSize {
|
||||
self.free_size.get()
|
||||
self.free_size
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn cleanup(&mut self) {}
|
||||
|
||||
#[inline]
|
||||
fn suballocations(&self) -> Self::Suballocations<'_> {
|
||||
self.suballocations.iter()
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct FreeListAllocatorState {
|
||||
node_allocator: slabbin::SlabAllocator<SuballocationListNode>,
|
||||
struct SuballocationList {
|
||||
head: NonNull<SuballocationListNode>,
|
||||
tail: NonNull<SuballocationListNode>,
|
||||
len: usize,
|
||||
// Free suballocations sorted by size in ascending order. This means we can always find a
|
||||
// best-fit in *O*(log(*n*)) time in the worst case, and iterating in order is very efficient.
|
||||
free_list: Vec<NonNull<SuballocationListNode>>,
|
||||
node_allocator: slabbin::SlabAllocator<SuballocationListNode>,
|
||||
}
|
||||
|
||||
unsafe impl Send for SuballocationList {}
|
||||
unsafe impl Sync for SuballocationList {}
|
||||
|
||||
#[derive(Clone, Copy, Debug)]
|
||||
struct SuballocationListNode {
|
||||
prev: Option<NonNull<Self>>,
|
||||
next: Option<NonNull<Self>>,
|
||||
offset: DeviceSize,
|
||||
size: DeviceSize,
|
||||
ty: SuballocationType,
|
||||
allocation_type: SuballocationType,
|
||||
}
|
||||
|
||||
impl PartialEq for SuballocationListNode {
|
||||
@ -300,48 +310,7 @@ impl Ord for SuballocationListNode {
|
||||
}
|
||||
}
|
||||
|
||||
/// Tells us if a suballocation is free, and if not, whether it is linear or not. This is needed in
|
||||
/// order to be able to respect the buffer-image granularity.
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
enum SuballocationType {
|
||||
Unknown,
|
||||
Linear,
|
||||
NonLinear,
|
||||
Free,
|
||||
}
|
||||
|
||||
impl From<AllocationType> for SuballocationType {
|
||||
fn from(ty: AllocationType) -> Self {
|
||||
match ty {
|
||||
AllocationType::Unknown => SuballocationType::Unknown,
|
||||
AllocationType::Linear => SuballocationType::Linear,
|
||||
AllocationType::NonLinear => SuballocationType::NonLinear,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl FreeListAllocatorState {
|
||||
/// Removes the target suballocation from the free-list.
|
||||
///
|
||||
/// # Safety
|
||||
///
|
||||
/// - `node_ptr` must refer to a currently free suballocation of `self`.
|
||||
unsafe fn allocate(&mut self, node_ptr: NonNull<SuballocationListNode>) {
|
||||
debug_assert!(self.free_list.contains(&node_ptr));
|
||||
|
||||
let node = unsafe { *node_ptr.as_ptr() };
|
||||
|
||||
match self
|
||||
.free_list
|
||||
.binary_search_by_key(&node, |&ptr| unsafe { *ptr.as_ptr() })
|
||||
{
|
||||
Ok(index) => {
|
||||
self.free_list.remove(index);
|
||||
}
|
||||
Err(_) => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
impl SuballocationList {
|
||||
/// Fits a suballocation inside the target one, splitting the target at the ends if required.
|
||||
///
|
||||
/// # Safety
|
||||
@ -356,7 +325,7 @@ impl FreeListAllocatorState {
|
||||
) {
|
||||
let node = unsafe { *node_ptr.as_ptr() };
|
||||
|
||||
debug_assert!(node.ty == SuballocationType::Free);
|
||||
debug_assert_eq!(node.allocation_type, SuballocationType::Free);
|
||||
debug_assert!(offset >= node.offset);
|
||||
debug_assert!(offset + size <= node.offset + node.size);
|
||||
|
||||
@ -372,7 +341,7 @@ impl FreeListAllocatorState {
|
||||
next: Some(node_ptr),
|
||||
offset: node.offset,
|
||||
size: padding_front,
|
||||
ty: SuballocationType::Free,
|
||||
allocation_type: SuballocationType::Free,
|
||||
};
|
||||
unsafe { padding_ptr.as_ptr().write(padding) };
|
||||
|
||||
@ -387,6 +356,12 @@ impl FreeListAllocatorState {
|
||||
// of the padding, so this can't overflow.
|
||||
unsafe { (*node_ptr.as_ptr()).size -= padding.size };
|
||||
|
||||
if node_ptr == self.head {
|
||||
self.head = padding_ptr;
|
||||
}
|
||||
|
||||
self.len += 1;
|
||||
|
||||
// SAFETY: We just created this suballocation, so there's no way that it was
|
||||
// deallocated already.
|
||||
unsafe { self.deallocate(padding_ptr) };
|
||||
@ -399,7 +374,7 @@ impl FreeListAllocatorState {
|
||||
next: node.next,
|
||||
offset: offset + size,
|
||||
size: padding_back,
|
||||
ty: SuballocationType::Free,
|
||||
allocation_type: SuballocationType::Free,
|
||||
};
|
||||
unsafe { padding_ptr.as_ptr().write(padding) };
|
||||
|
||||
@ -411,6 +386,12 @@ impl FreeListAllocatorState {
|
||||
// This is overflow-safe for the same reason as above.
|
||||
unsafe { (*node_ptr.as_ptr()).size -= padding.size };
|
||||
|
||||
if node_ptr == self.tail {
|
||||
self.tail = padding_ptr;
|
||||
}
|
||||
|
||||
self.len += 1;
|
||||
|
||||
// SAFETY: Same as above.
|
||||
unsafe { self.deallocate(padding_ptr) };
|
||||
}
|
||||
@ -439,12 +420,12 @@ impl FreeListAllocatorState {
|
||||
unsafe fn coalesce(&mut self, node_ptr: NonNull<SuballocationListNode>) {
|
||||
let node = unsafe { *node_ptr.as_ptr() };
|
||||
|
||||
debug_assert!(node.ty == SuballocationType::Free);
|
||||
debug_assert_eq!(node.allocation_type, SuballocationType::Free);
|
||||
|
||||
if let Some(prev_ptr) = node.prev {
|
||||
let prev = unsafe { *prev_ptr.as_ptr() };
|
||||
|
||||
if prev.ty == SuballocationType::Free {
|
||||
if prev.allocation_type == SuballocationType::Free {
|
||||
// SAFETY: We checked that the suballocation is free.
|
||||
self.allocate(prev_ptr);
|
||||
|
||||
@ -458,11 +439,18 @@ impl FreeListAllocatorState {
|
||||
unsafe { (*prev_ptr.as_ptr()).next = Some(node_ptr) };
|
||||
}
|
||||
|
||||
if prev_ptr == self.head {
|
||||
self.head = node_ptr;
|
||||
}
|
||||
|
||||
self.len -= 1;
|
||||
|
||||
// SAFETY:
|
||||
// - The suballocation is free.
|
||||
// - The suballocation was removed from the free-list.
|
||||
// - The next suballocation and possibly a previous suballocation have been updated
|
||||
// such that they no longer reference the suballocation.
|
||||
// - The head no longer points to the suballocation if it used to.
|
||||
// All of these conditions combined guarantee that `prev_ptr` cannot be used again.
|
||||
unsafe { self.node_allocator.deallocate(prev_ptr) };
|
||||
}
|
||||
@ -471,7 +459,7 @@ impl FreeListAllocatorState {
|
||||
if let Some(next_ptr) = node.next {
|
||||
let next = unsafe { *next_ptr.as_ptr() };
|
||||
|
||||
if next.ty == SuballocationType::Free {
|
||||
if next.allocation_type == SuballocationType::Free {
|
||||
// SAFETY: Same as above.
|
||||
self.allocate(next_ptr);
|
||||
|
||||
@ -483,9 +471,123 @@ impl FreeListAllocatorState {
|
||||
unsafe { (*next_ptr.as_ptr()).prev = Some(node_ptr) };
|
||||
}
|
||||
|
||||
if next_ptr == self.tail {
|
||||
self.tail = node_ptr;
|
||||
}
|
||||
|
||||
self.len -= 1;
|
||||
|
||||
// SAFETY: Same as above.
|
||||
unsafe { self.node_allocator.deallocate(next_ptr) };
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Removes the target suballocation from the free-list.
|
||||
///
|
||||
/// # Safety
|
||||
///
|
||||
/// - `node_ptr` must refer to a currently free suballocation of `self`.
|
||||
unsafe fn allocate(&mut self, node_ptr: NonNull<SuballocationListNode>) {
|
||||
debug_assert!(self.free_list.contains(&node_ptr));
|
||||
|
||||
let node = unsafe { *node_ptr.as_ptr() };
|
||||
|
||||
match self
|
||||
.free_list
|
||||
.binary_search_by_key(&node, |&ptr| unsafe { *ptr.as_ptr() })
|
||||
{
|
||||
Ok(index) => {
|
||||
self.free_list.remove(index);
|
||||
}
|
||||
Err(_) => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
fn iter(&self) -> Suballocations<'_> {
|
||||
Suballocations {
|
||||
head: Some(self.head),
|
||||
tail: Some(self.tail),
|
||||
len: self.len,
|
||||
marker: PhantomData,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone)]
|
||||
pub struct Suballocations<'a> {
|
||||
head: Option<NonNull<SuballocationListNode>>,
|
||||
tail: Option<NonNull<SuballocationListNode>>,
|
||||
len: usize,
|
||||
marker: PhantomData<&'a SuballocationList>,
|
||||
}
|
||||
|
||||
unsafe impl Send for Suballocations<'_> {}
|
||||
unsafe impl Sync for Suballocations<'_> {}
|
||||
|
||||
impl Iterator for Suballocations<'_> {
|
||||
type Item = SuballocationNode;
|
||||
|
||||
#[inline]
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
if self.len != 0 {
|
||||
if let Some(head) = self.head {
|
||||
let head = unsafe { *head.as_ptr() };
|
||||
self.head = head.next;
|
||||
self.len -= 1;
|
||||
|
||||
Some(SuballocationNode {
|
||||
offset: head.offset,
|
||||
size: head.size,
|
||||
allocation_type: head.allocation_type,
|
||||
})
|
||||
} else {
|
||||
None
|
||||
}
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn size_hint(&self) -> (usize, Option<usize>) {
|
||||
(self.len, Some(self.len))
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn last(mut self) -> Option<Self::Item> {
|
||||
self.next_back()
|
||||
}
|
||||
}
|
||||
|
||||
impl DoubleEndedIterator for Suballocations<'_> {
|
||||
#[inline]
|
||||
fn next_back(&mut self) -> Option<Self::Item> {
|
||||
if self.len != 0 {
|
||||
if let Some(tail) = self.tail {
|
||||
let tail = unsafe { *tail.as_ptr() };
|
||||
self.tail = tail.prev;
|
||||
self.len -= 1;
|
||||
|
||||
Some(SuballocationNode {
|
||||
offset: tail.offset,
|
||||
size: tail.size,
|
||||
allocation_type: tail.allocation_type,
|
||||
})
|
||||
} else {
|
||||
None
|
||||
}
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl ExactSizeIterator for Suballocations<'_> {
|
||||
#[inline]
|
||||
fn len(&self) -> usize {
|
||||
self.len
|
||||
}
|
||||
}
|
||||
|
||||
impl FusedIterator for Suballocations<'_> {}
|
||||
|
||||
@ -78,6 +78,15 @@ mod free_list;
|
||||
/// [page]: super#pages
|
||||
/// [buffer-image granularity]: super#buffer-image-granularity
|
||||
pub unsafe trait Suballocator {
|
||||
/// The type of iterator returned by [`suballocations`].
|
||||
///
|
||||
/// [`suballocations`]: Self::suballocations
|
||||
type Suballocations<'a>: Iterator<Item = SuballocationNode>
|
||||
+ DoubleEndedIterator
|
||||
+ ExactSizeIterator
|
||||
where
|
||||
Self: Sized + 'a;
|
||||
|
||||
/// Creates a new suballocator for the given [region].
|
||||
///
|
||||
/// [region]: Self#regions
|
||||
@ -115,7 +124,7 @@ pub unsafe trait Suballocator {
|
||||
/// [buffer-image granularity]: super#buffer-image-granularity
|
||||
/// [`DeviceMemory`]: crate::memory::DeviceMemory
|
||||
fn allocate(
|
||||
&self,
|
||||
&mut self,
|
||||
layout: DeviceLayout,
|
||||
allocation_type: AllocationType,
|
||||
buffer_image_granularity: DeviceAlignment,
|
||||
@ -126,7 +135,7 @@ pub unsafe trait Suballocator {
|
||||
/// # Safety
|
||||
///
|
||||
/// - `suballocation` must refer to a **currently allocated** suballocation of `self`.
|
||||
unsafe fn deallocate(&self, suballocation: Suballocation);
|
||||
unsafe fn deallocate(&mut self, suballocation: Suballocation);
|
||||
|
||||
/// Returns the total amount of free space that is left in the [region].
|
||||
///
|
||||
@ -137,6 +146,11 @@ pub unsafe trait Suballocator {
|
||||
///
|
||||
/// There must be no current allocations as they might get freed.
|
||||
fn cleanup(&mut self);
|
||||
|
||||
/// Returns an iterator over the current suballocations.
|
||||
fn suballocations(&self) -> Self::Suballocations<'_>
|
||||
where
|
||||
Self: Sized;
|
||||
}
|
||||
|
||||
impl Debug for dyn Suballocator {
|
||||
@ -299,6 +313,59 @@ impl Display for SuballocatorError {
|
||||
}
|
||||
}
|
||||
|
||||
/// A node within a [suballocator]'s list/tree of suballocations.
|
||||
///
|
||||
/// [suballocator]: Suballocator
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
|
||||
pub struct SuballocationNode {
|
||||
/// The **absolute** offset within the [region]. That means that this is already offset by the
|
||||
/// region's offset, **not relative to beginning of the region**.
|
||||
///
|
||||
/// [region]: Suballocator#regions
|
||||
pub offset: DeviceSize,
|
||||
|
||||
/// The size of the allocation.
|
||||
pub size: DeviceSize,
|
||||
|
||||
/// Tells us if the allocation is free, and if not, what type of resources can be bound to it.
|
||||
pub allocation_type: SuballocationType,
|
||||
}
|
||||
|
||||
/// Tells us if an allocation within a [suballocator]'s list/tree of suballocations is free, and if
|
||||
/// not, what type of resources can be bound to it. The suballocator needs to keep track of this in
|
||||
/// order to be able to respect the buffer-image granularity.
|
||||
///
|
||||
/// [suballocator]: Suballocator
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
|
||||
pub enum SuballocationType {
|
||||
/// The type of resource is unknown, it might be either linear or non-linear. What this means
|
||||
/// is that allocations created with this type must always be aligned to the buffer-image
|
||||
/// granularity.
|
||||
Unknown = 0,
|
||||
|
||||
/// The resource is linear, e.g. buffers, linear images. A linear allocation following another
|
||||
/// linear allocation never needs to be aligned to the buffer-image granularity.
|
||||
Linear = 1,
|
||||
|
||||
/// The resource is non-linear, e.g. optimal images. A non-linear allocation following another
|
||||
/// non-linear allocation never needs to be aligned to the buffer-image granularity.
|
||||
NonLinear = 2,
|
||||
|
||||
/// The allocation is free. It can take on any of the allocation types once allocated.
|
||||
Free = 3,
|
||||
}
|
||||
|
||||
impl From<AllocationType> for SuballocationType {
|
||||
#[inline]
|
||||
fn from(ty: AllocationType) -> Self {
|
||||
match ty {
|
||||
AllocationType::Unknown => SuballocationType::Unknown,
|
||||
AllocationType::Linear => SuballocationType::Linear,
|
||||
AllocationType::NonLinear => SuballocationType::NonLinear,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Checks if resouces A and B share a page.
|
||||
///
|
||||
/// > **Note**: Assumes `a_offset + a_size > 0` and `a_offset + a_size <= b_offset`.
|
||||
@ -367,7 +434,7 @@ mod tests {
|
||||
}
|
||||
});
|
||||
|
||||
let allocator = allocator.into_inner();
|
||||
let mut allocator = allocator.into_inner();
|
||||
|
||||
assert!(allocator
|
||||
.allocate(DUMMY_LAYOUT, AllocationType::Unknown, DeviceAlignment::MIN)
|
||||
@ -394,7 +461,7 @@ mod tests {
|
||||
const REGION_SIZE: DeviceSize = 10 * 256;
|
||||
const LAYOUT: DeviceLayout = unwrap(DeviceLayout::from_size_alignment(1, 256));
|
||||
|
||||
let allocator = FreeListAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut allocator = FreeListAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut allocs = Vec::with_capacity(10);
|
||||
|
||||
for _ in 0..10 {
|
||||
@ -420,7 +487,7 @@ mod tests {
|
||||
const GRANULARITY: DeviceAlignment = unwrap(DeviceAlignment::new(16));
|
||||
const REGION_SIZE: DeviceSize = 2 * GRANULARITY.as_devicesize();
|
||||
|
||||
let allocator = FreeListAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut allocator = FreeListAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut linear_allocs = Vec::with_capacity(REGION_SIZE as usize / 2);
|
||||
let mut nonlinear_allocs = Vec::with_capacity(REGION_SIZE as usize / 2);
|
||||
|
||||
@ -479,7 +546,7 @@ mod tests {
|
||||
const MAX_ORDER: usize = 10;
|
||||
const REGION_SIZE: DeviceSize = BuddyAllocator::MIN_NODE_SIZE << MAX_ORDER;
|
||||
|
||||
let allocator = BuddyAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut allocator = BuddyAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut allocs = Vec::with_capacity(1 << MAX_ORDER);
|
||||
|
||||
for order in 0..=MAX_ORDER {
|
||||
@ -541,7 +608,7 @@ mod tests {
|
||||
fn buddy_allocator_respects_alignment() {
|
||||
const REGION_SIZE: DeviceSize = 4096;
|
||||
|
||||
let allocator = BuddyAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut allocator = BuddyAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
|
||||
{
|
||||
let layout = DeviceLayout::from_size_alignment(1, 4096).unwrap();
|
||||
@ -608,7 +675,7 @@ mod tests {
|
||||
const GRANULARITY: DeviceAlignment = unwrap(DeviceAlignment::new(256));
|
||||
const REGION_SIZE: DeviceSize = 2 * GRANULARITY.as_devicesize();
|
||||
|
||||
let allocator = BuddyAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
let mut allocator = BuddyAllocator::new(Region::new(0, REGION_SIZE).unwrap());
|
||||
|
||||
{
|
||||
const ALLOCATIONS: DeviceSize = REGION_SIZE / BuddyAllocator::MIN_NODE_SIZE;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user