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Don't use mmap on platforms that have large OS page sizes

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Peter Zhu 2021-03-01 10:05:55 -05:00 committed by Aaron Patterson
parent 6d834371c0
commit 0bd1bc559f
Notes: git 2021-03-03 03:05:22 +09:00 
Merged: https://github.com/ruby/ruby/pull/4235
2 changed files with 20 additions and 3 deletions
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2
configure.ac
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@ -1931,6 +1931,7 @@ AC_CHECK_FUNCS(lutimes)
AC_CHECK_FUNCS(malloc_usable_size)
AC_CHECK_FUNCS(malloc_size)
AC_CHECK_FUNCS(mblen)
AC_CHECK_FUNCS(memalign)
AC_CHECK_FUNCS(memset_s)
AC_CHECK_FUNCS(writev)
AC_CHECK_FUNCS(memrchr)
@ -1943,6 +1944,7 @@ AC_CHECK_FUNCS(openat)
AC_CHECK_FUNCS(pipe2)
AC_CHECK_FUNCS(poll)
AC_CHECK_FUNCS(posix_fadvise)
AC_CHECK_FUNCS(posix_memalign)
AC_CHECK_FUNCS(ppoll)
AC_CHECK_FUNCS(pread)
AC_CHECK_FUNCS(pwrite)

21
gc.c
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@ -823,6 +823,13 @@ enum {
HEAP_PAGE_BITMAP_SIZE = (BITS_SIZE * HEAP_PAGE_BITMAP_LIMIT),
HEAP_PAGE_BITMAP_PLANES = 4 /* RGENGC: mark, unprotected, uncollectible, marking */
};
#define HEAP_PAGE_ALIGN (1 << HEAP_PAGE_ALIGN_LOG)
#define HEAP_PAGE_SIZE HEAP_PAGE_ALIGN
#if defined(HAVE_MMAP) && (PAGE_SIZE <= HEAP_PAGE_SIZE)
# define USE_MMAP_ALIGNED_ALLOC 1
#else
# define USE_MMAP_ALIGNED_ALLOC 0
#endif
struct heap_page {
short total_slots;
@ -9989,7 +9996,7 @@ gc_set_auto_compact(rb_execution_context_t *ec, VALUE _, VALUE v)
/* If not MinGW, Windows, or does not have mmap, we cannot use mprotect for
* the read barrier, so we must disable automatic compaction. */
#if !defined(__MINGW32__) && !defined(_WIN32) && !defined(HAVE_MMAP)
#if !defined(__MINGW32__) && !defined(_WIN32) && !USE_MMAP_ALIGNED_ALLOC
rb_raise(rb_eNotImpError, "Automatic compaction isn't available on this platform");
#endif
@ -10389,7 +10396,7 @@ rb_aligned_malloc(size_t alignment, size_t size)
#elif defined _WIN32
void *_aligned_malloc(size_t, size_t);
res = _aligned_malloc(size, alignment);
#elif defined(HAVE_MMAP)
#elif USE_MMAP_ALIGNED_ALLOC
GC_ASSERT(alignment % sysconf(_SC_PAGE_SIZE) == 0);
char *ptr = mmap(NULL, alignment + size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
@ -10419,6 +10426,12 @@ rb_aligned_malloc(size_t alignment, size_t size)
}
res = (void *)aligned;
#elif defined(HAVE_POSIX_MEMALIGN)
if (posix_memalign(&res, alignment, size) != 0) {
return NULL;
}
#elif defined(HAVE_MEMALIGN)
res = memalign(alignment, size);
#else
char* aligned;
res = malloc(alignment + size + sizeof(void*));
@ -10441,11 +10454,13 @@ rb_aligned_free(void *ptr, size_t size)
__mingw_aligned_free(ptr);
#elif defined _WIN32
_aligned_free(ptr);
#elif defined HAVE_MMAP
#elif USE_MMAP_ALIGNED_ALLOC
GC_ASSERT(size % sysconf(_SC_PAGE_SIZE) == 0);
if (munmap(ptr, size)) {
rb_bug("rb_aligned_free: munmap failed");
}
#elif defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_MEMALIGN)
free(ptr);
#else
free(((void**)ptr)[-1]);
#endif