Bug #18133 » mmap.patch
| configure.ac | ||
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AC_CHECK_FUNCS(mkfifo)
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AC_CHECK_FUNCS(mknod)
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AC_CHECK_FUNCS(mktime)
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AC_CHECK_FUNCS(mmap)
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AC_CHECK_FUNCS(openat)
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AC_CHECK_FUNCS(pipe2)
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AC_CHECK_FUNCS(poll)
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| ... | ... | |
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rb_cv_fork_with_pthread=yes)])
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test x$rb_cv_fork_with_pthread = xyes || AC_DEFINE(CANNOT_FORK_WITH_PTHREAD)
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])
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AC_CHECK_HEADERS([sys/user.h])
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AS_IF([test "x$ac_cv_func_mmap" = xyes], [
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AC_CACHE_CHECK([whether PAGE_SIZE is compile-time const], rb_cv_const_page_size,
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[malloc_headers=`sed -n '/MALLOC_HEADERS_BEGIN/,/MALLOC_HEADERS_END/p' ${srcdir}/gc.c`
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[$malloc_headers
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typedef char conftest_page[PAGE_SIZE];
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]], [[]])],
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[rb_cv_const_page_size=yes],
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[rb_cv_const_page_size=no])])
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])
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AS_IF([test "x$rb_cv_const_page_size" = xyes],
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[AC_DEFINE(HAVE_CONST_PAGE_SIZE, 1)],
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[AC_DEFINE(HAVE_CONST_PAGE_SIZE, 0)]
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)
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}
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: "runtime section" && {
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| gc.c | ||
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#include <stdarg.h>
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#include <stdio.h>
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/* MALLOC_HEADERS_BEGIN */
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#ifndef HAVE_MALLOC_USABLE_SIZE
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# ifdef _WIN32
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# define HAVE_MALLOC_USABLE_SIZE
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| ... | ... | |
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# endif
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#endif
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#if !defined(PAGE_SIZE) && defined(HAVE_SYS_USER_H)
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/* LIST_HEAD conflicts with sys/queue.h on macOS */
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# include <sys/user.h>
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#endif
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/* MALLOC_HEADERS_END */
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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| ... | ... | |
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HEAP_PAGE_BITMAP_SIZE = (BITS_SIZE * HEAP_PAGE_BITMAP_LIMIT),
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HEAP_PAGE_BITMAP_PLANES = 4 /* RGENGC: mark, unprotected, uncollectible, marking */
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};
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#define HEAP_PAGE_ALIGN (1 << HEAP_PAGE_ALIGN_LOG)
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#define HEAP_PAGE_SIZE HEAP_PAGE_ALIGN
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#ifdef HAVE_MMAP
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# if HAVE_CONST_PAGE_SIZE
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/* If we have the HEAP_PAGE and it is a constant, then we can directly use it. */
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static const bool USE_MMAP_ALIGNED_ALLOC = (PAGE_SIZE <= HEAP_PAGE_SIZE);
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# elif defined(PAGE_MAX_SIZE) && (PAGE_MAX_SIZE <= HEAP_PAGE_SIZE)
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/* PAGE_SIZE <= HEAP_PAGE_SIZE */
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static const bool USE_MMAP_ALIGNED_ALLOC = true;
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# else
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/* Otherwise, fall back to determining if we can use mmap during runtime. */
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# define USE_MMAP_ALIGNED_ALLOC (use_mmap_aligned_alloc != false)
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static bool use_mmap_aligned_alloc;
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# endif
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#elif !defined(__MINGW32__) && !defined(_WIN32)
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static const bool USE_MMAP_ALIGNED_ALLOC = false;
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#endif
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struct heap_page {
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short total_slots;
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| ... | ... | |
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heap->total_slots -= page->total_slots;
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}
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static void rb_aligned_free(void *ptr);
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static void rb_aligned_free(void *ptr, size_t size);
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static void
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heap_page_free(rb_objspace_t *objspace, struct heap_page *page)
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{
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heap_allocated_pages--;
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objspace->profile.total_freed_pages++;
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rb_aligned_free(GET_PAGE_BODY(page->start));
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rb_aligned_free(GET_PAGE_BODY(page->start), HEAP_PAGE_SIZE);
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free(page);
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}
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| ... | ... | |
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/* assign heap_page entry */
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page = calloc1(sizeof(struct heap_page));
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if (page == 0) {
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rb_aligned_free(page_body);
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rb_aligned_free(page_body, HEAP_PAGE_SIZE);
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rb_memerror();
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}
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| ... | ... | |
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{
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rb_objspace_t *objspace = &rb_objspace;
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#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
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/* If Ruby's heap pages are not a multiple of the system page size, we
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* cannot use mprotect for the read barrier, so we must disable automatic
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* compaction. */
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int pagesize;
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pagesize = (int)sysconf(_SC_PAGE_SIZE);
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if ((HEAP_PAGE_SIZE % pagesize) != 0) {
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ruby_enable_autocompact = 0;
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}
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#if defined(HAVE_MMAP) && !HAVE_CONST_PAGE_SIZE && !defined(PAGE_MAX_SIZE)
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/* Need to determine if we can use mmap at runtime. */
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# ifdef PAGE_SIZE
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/* If the PAGE_SIZE macro can be used. */
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use_mmap_aligned_alloc = PAGE_SIZE <= HEAP_PAGE_SIZE;
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# elif defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
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/* If we can use sysconf to determine the page size. */
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use_mmap_aligned_alloc = sysconf(_SC_PAGE_SIZE) <= HEAP_PAGE_SIZE;
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# else
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/* Otherwise we can't determine the system page size, so don't use mmap. */
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use_mmap_aligned_alloc = FALSE;
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# endif
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#endif
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objspace->next_object_id = INT2FIX(OBJ_ID_INITIAL);
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| ... | ... | |
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/* For now, compact implies full mark / sweep, so ignore other flags */
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if (RTEST(compact)) {
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/* If not MinGW, Windows, or does not have mmap, we cannot use mprotect for
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* the read barrier, so we must disable compaction. */
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#if !defined(__MINGW32__) && !defined(_WIN32)
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if (!USE_MMAP_ALIGNED_ALLOC) {
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rb_raise(rb_eNotImpError, "Compaction isn't available on this platform");
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}
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#endif
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reason |= GPR_FLAG_COMPACT;
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} else {
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if (!RTEST(full_mark)) reason &= ~GPR_FLAG_FULL_MARK;
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| ... | ... | |
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static VALUE
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gc_set_auto_compact(rb_execution_context_t *ec, VALUE _, VALUE v)
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{
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#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
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/* If Ruby's heap pages are not a multiple of the system page size, we
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* cannot use mprotect for the read barrier, so we must disable automatic
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* compaction. */
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int pagesize;
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pagesize = (int)sysconf(_SC_PAGE_SIZE);
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if ((HEAP_PAGE_SIZE % pagesize) != 0) {
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/* If not MinGW, Windows, or does not have mmap, we cannot use mprotect for
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* the read barrier, so we must disable automatic compaction. */
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#if !defined(__MINGW32__) && !defined(_WIN32)
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if (!USE_MMAP_ALIGNED_ALLOC) {
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rb_raise(rb_eNotImpError, "Automatic compaction isn't available on this platform");
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}
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#endif
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ruby_enable_autocompact = RTEST(v);
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return v;
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}
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| ... | ... | |
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#elif defined _WIN32
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void *_aligned_malloc(size_t, size_t);
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res = _aligned_malloc(size, alignment);
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#elif defined(HAVE_POSIX_MEMALIGN)
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if (posix_memalign(&res, alignment, size) == 0) {
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return res;
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#else
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if (USE_MMAP_ALIGNED_ALLOC) {
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GC_ASSERT(alignment % sysconf(_SC_PAGE_SIZE) == 0);
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char *ptr = mmap(NULL, alignment + size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (ptr == MAP_FAILED) {
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return NULL;
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}
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char *aligned = ptr + alignment;
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aligned -= ((VALUE)aligned & (alignment - 1));
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GC_ASSERT(aligned > ptr);
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GC_ASSERT(aligned <= ptr + alignment);
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size_t start_out_of_range_size = aligned - ptr;
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GC_ASSERT(start_out_of_range_size % sysconf(_SC_PAGE_SIZE) == 0);
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if (start_out_of_range_size > 0) {
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if (munmap(ptr, start_out_of_range_size)) {
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rb_bug("rb_aligned_malloc: munmap failed for start");
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}
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}
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size_t end_out_of_range_size = alignment - start_out_of_range_size;
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GC_ASSERT(end_out_of_range_size % sysconf(_SC_PAGE_SIZE) == 0);
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if (end_out_of_range_size > 0) {
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if (munmap(aligned + size, end_out_of_range_size)) {
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rb_bug("rb_aligned_malloc: munmap failed for end");
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}
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}
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res = (void *)aligned;
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}
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else {
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return NULL;
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# if defined(HAVE_POSIX_MEMALIGN)
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if (posix_memalign(&res, alignment, size) != 0) {
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return NULL;
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}
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# elif defined(HAVE_MEMALIGN)
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res = memalign(alignment, size);
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# else
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char* aligned;
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res = malloc(alignment + size + sizeof(void*));
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aligned = (char*)res + alignment + sizeof(void*);
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aligned -= ((VALUE)aligned & (alignment - 1));
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((void**)aligned)[-1] = res;
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res = (void*)aligned;
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# endif
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}
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#elif defined(HAVE_MEMALIGN)
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res = memalign(alignment, size);
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#else
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char* aligned;
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res = malloc(alignment + size + sizeof(void*));
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aligned = (char*)res + alignment + sizeof(void*);
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aligned -= ((VALUE)aligned & (alignment - 1));
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((void**)aligned)[-1] = res;
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res = (void*)aligned;
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#endif
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/* alignment must be a power of 2 */
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| ... | ... | |
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}
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static void
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rb_aligned_free(void *ptr)
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rb_aligned_free(void *ptr, size_t size)
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{
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#if defined __MINGW32__
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__mingw_aligned_free(ptr);
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#elif defined _WIN32
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_aligned_free(ptr);
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#elif defined(HAVE_MEMALIGN) || defined(HAVE_POSIX_MEMALIGN)
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free(ptr);
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#else
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free(((void**)ptr)[-1]);
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if (USE_MMAP_ALIGNED_ALLOC) {
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GC_ASSERT(size % sysconf(_SC_PAGE_SIZE) == 0);
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if (munmap(ptr, size)) {
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rb_bug("rb_aligned_free: munmap failed");
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}
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}
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else {
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# if defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_MEMALIGN)
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free(ptr);
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# else
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free(((void**)ptr)[-1]);
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# endif
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}
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#endif
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}
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| test/ruby/test_gc_compact.rb | ||
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require 'etc'
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class TestGCCompact < Test::Unit::TestCase
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class AutoCompact < Test::Unit::TestCase
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module SupportsCompact
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def setup
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skip "autocompact not supported on this platform" unless supports_auto_compact?
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super
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end
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private
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def supports_auto_compact?
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return true unless defined?(Etc::SC_PAGE_SIZE)
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begin
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return GC::INTERNAL_CONSTANTS[:HEAP_PAGE_SIZE] % Etc.sysconf(Etc::SC_PAGE_SIZE) == 0
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rescue NotImplementedError
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rescue ArgumentError
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end
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true
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end
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end
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include SupportsCompact
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class AutoCompact < Test::Unit::TestCase
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include SupportsCompact
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def test_enable_autocompact
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before = GC.auto_compact
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GC.auto_compact = true
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| ... | ... | |
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ensure
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GC.auto_compact = before
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end
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private
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def supports_auto_compact?
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return true unless defined?(Etc::SC_PAGE_SIZE)
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begin
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return GC::INTERNAL_CONSTANTS[:HEAP_PAGE_SIZE] % Etc.sysconf(Etc::SC_PAGE_SIZE) == 0
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rescue NotImplementedError
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rescue ArgumentError
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end
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true
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end
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end
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def os_page_size
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return true unless defined?(Etc::SC_PAGE_SIZE)
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end
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def setup
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skip "autocompact not supported on this platform" unless supports_auto_compact?
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super
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end
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def test_gc_compact_stats
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list = []
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