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Remove at_least

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The Pal was providing policy for overallocating a block of memory to
achieve alignment make that part of the backend.
The backend should be responsible for layout policy.
This commit is contained in:
Matthew Parkinson
2021-07-19 11:20:02 +01:00
committed by Matthew Parkinson
parent 9df0101dfd
commit 5d0ae71423
10 changed files with 50 additions and 68 deletions
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docs/PORTING.md
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@@ -47,14 +47,14 @@ pages, rather than zeroing them synchronously in this call
```c++
template<bool committed>
static void* reserve_aligned(size_t size) noexcept;
static std::pair<void*, size_t> reserve_at_least(size_t size) noexcept;
static void* reserve(size_t size) noexcept;
```
All platforms should provide `reserve_at_least` and can optionally provide
All platforms should provide `reserve` and can optionally provide
`reserve_aligned` if the underlying system can provide strongly aligned
memory regions.
If the system guarantees only page alignment, implement only the second. The Pal is
free to overallocate based on the platform's desire and snmalloc
will find suitably aligned blocks inside the region. `reserve_at_least` should
will find suitably aligned blocks inside the region. `reserve` should
not commit memory as snmalloc will commit the range of memory it requires of what
is returned.