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Fix potential VM map fragmentation regression.

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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.
This commit is contained in:
Jason Evans 2016-06-07 14:15:49 -07:00
parent de23f6fce7
commit dd752c1ffd
2 changed files with 2 additions and 2 deletions
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2
include/jemalloc/internal/jemalloc_internal.h.in
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@ -813,7 +813,7 @@ sa2u(size_t size, size_t alignment)
* Calculate the multi-page mapping that large_palloc() would need in
* order to guarantee the alignment.
*/
if (usize + large_pad + PAGE_CEILING(alignment) < usize) {
if (usize + large_pad + PAGE_CEILING(alignment) - PAGE < usize) {
/* size_t overflow. */
return (0);
}

2
src/extent_mmap.c
View file

@ -9,7 +9,7 @@ extent_alloc_mmap_slow(size_t size, size_t alignment, bool *zero, bool *commit)
void *ret;
size_t alloc_size;
alloc_size = size + alignment;
alloc_size = size + alignment - PAGE;
/* Beware size_t wrap-around. */
if (alloc_size < size)
return (NULL);