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add comments on how page alisngment

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This commit is contained in:
Matthew Flatt 2015-07-03 12:40:26 -06:00
parent 331b104345
commit ff492f9bb6
1 changed files with 6 additions and 2 deletions
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8
racket/src/racket/gc2/vm.c
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@ -17,7 +17,7 @@ enum {
};
#if defined(_WIN32) || defined(__CYGWIN32__)
/* No block cache or alloc cache */
/* No block cache or alloc cache; relies on APAGE_SIZE matching allocator's alignment */
#elif defined(OSKIT)
# define OS_ALLOCATOR_NEEDS_ALIGNMENT
#elif defined(MZ_USE_PLACES) || defined(PREFER_MMAP_LARGE_BLOCKS)
@ -30,6 +30,10 @@ enum {
# define USE_ALLOC_CACHE
#endif
/* Either USE_ALLOC_CACHE or OS_ALLOCATOR_NEEDS_ALIGNMENT must be
enabled, unless the lower-level allocator's alignment matches
APAGE_SIZE. */
struct AllocCacheBlock;
struct BlockCache;
typedef struct MMU {
@ -78,7 +82,7 @@ static inline size_t mmu_round_up_to_os_page_size(MMU *mmu, size_t len) {
static inline void mmu_assert_os_page_aligned(MMU *mmu, size_t p) {
if (p & (mmu->os_pagesize - 1)) {
printf("address or size is not OS PAGE ALIGNED!!!!");
GCPRINT(GCOUTF, "address or size is not page-aligned\n");
abort();
}
}