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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 14:19:50 -07:00
parent 48384dc2d8
commit 05a9e4ac65
3 changed files with 4 additions and 4 deletions
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4
include/jemalloc/internal/jemalloc_internal.h.in
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@ -754,7 +754,7 @@ sa2u(size_t size, size_t alignment)
* Calculate the size of the over-size run that arena_palloc()
* would need to allocate in order to guarantee the alignment.
*/
if (usize + large_pad + alignment <= arena_maxrun)
if (usize + large_pad + alignment - PAGE <= arena_maxrun)
return (usize);
}
@ -784,7 +784,7 @@ sa2u(size_t size, size_t alignment)
* Calculate the multi-chunk mapping that huge_palloc() would need in
* order to guarantee the alignment.
*/
if (usize + alignment < usize) {
if (usize + alignment - PAGE < usize) {
/* size_t overflow. */
return (0);
}