Cheri-research/snmalloc
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Make chunk size at least the page size.

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On systems with larger than 16KiB page size, we have chunks
that divide a page.  This seems a little strange, and if we
want to disable the pages backing a chunk, this is not possible.

This change ensures the chunk is always at least a single page.
This commit is contained in:
Matthew Parkinson
2021-10-21 11:35:25 +01:00
committed by Matthew Parkinson
parent 4a7cd268f8
commit eb6c1a05c8
1 changed files with 2 additions and 1 deletions
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3
src/mem/allocconfig.h
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@@ -76,7 +76,8 @@ namespace snmalloc
static constexpr size_t MIN_ALLOC_BITS = bits::ctz_const(MIN_ALLOC_SIZE);
// Minimum slab size.
static constexpr size_t MIN_CHUNK_BITS = 14;
static constexpr size_t MIN_CHUNK_BITS = bits::max(
static_cast<size_t>(14), bits::next_pow2_bits_const(OS_PAGE_SIZE));
static constexpr size_t MIN_CHUNK_SIZE = bits::one_at_bit(MIN_CHUNK_BITS);
// Minimum number of objects on a slab