Fix potential VM map fragmentation regression.
Revert 245ae6036c
(Support --with-lg-page
values larger than actual page size.), because it could cause VM map
fragmentation if the kernel grows mmap()ed memory downward.
This resolves #391.
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@ -813,7 +813,7 @@ sa2u(size_t size, size_t alignment)
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* Calculate the multi-page mapping that large_palloc() would need in
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* order to guarantee the alignment.
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*/
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if (usize + large_pad + PAGE_CEILING(alignment) < usize) {
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if (usize + large_pad + PAGE_CEILING(alignment) - PAGE < usize) {
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/* size_t overflow. */
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return (0);
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}
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@ -9,7 +9,7 @@ extent_alloc_mmap_slow(size_t size, size_t alignment, bool *zero, bool *commit)
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void *ret;
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size_t alloc_size;
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alloc_size = size + alignment;
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alloc_size = size + alignment - PAGE;
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/* Beware size_t wrap-around. */
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if (alloc_size < size)
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return (NULL);
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