/* * Allocate a new section of memory to be used as old generation. */ static GCMemSection* alloc_major_section (void) { GCMemSection *section; int scan_starts; section = sgen_alloc_os_memory_aligned (MAJOR_SECTION_SIZE, MAJOR_SECTION_SIZE, TRUE); section->next_data = section->data = (char*)section + SGEN_SIZEOF_GC_MEM_SECTION; g_assert (!((mword)section->data & 7)); section->size = MAJOR_SECTION_SIZE - SGEN_SIZEOF_GC_MEM_SECTION; section->end_data = section->data + section->size; sgen_update_heap_boundaries ((mword)section->data, (mword)section->end_data); DEBUG (3, fprintf (gc_debug_file, "New major heap section: (%p-%p), total: %lld\n", section->data, section->end_data, (long long int)mono_gc_get_heap_size ())); scan_starts = (section->size + SGEN_SCAN_START_SIZE - 1) / SGEN_SCAN_START_SIZE; section->scan_starts = sgen_alloc_internal_dynamic (sizeof (char*) * scan_starts, INTERNAL_MEM_SCAN_STARTS); section->num_scan_start = scan_starts; section->block.role = MEMORY_ROLE_GEN1; section->is_to_space = TRUE; /* add to the section list */ section->block.next = section_list; section_list = section; ++num_major_sections; return section; }
void sgen_pinned_update_heap_boundaries (SgenPinnedAllocator *alc) { SgenPinnedChunk *chunk; for (chunk = alc->chunk_list; chunk; chunk = chunk->block.next) { char *end_chunk = (char*)chunk + chunk->num_pages * FREELIST_PAGESIZE; sgen_update_heap_boundaries ((mword)chunk, (mword)end_chunk); } }
static void major_sweep (void) { GCMemSection *section, *prev_section; to_space_set_next_data (); unset_to_space (); /* unpin objects from the pinned chunks and free the unmarked ones */ sweep_pinned_objects (); sgen_pinned_update_heap_boundaries (&pinned_allocator); /* free the unused sections */ prev_section = NULL; for (section = section_list; section;) { GCMemSection *this_section = section; /* to_space doesn't need handling here */ if (section->is_to_space) { section->is_to_space = FALSE; prev_section = section; section = section->block.next; goto update; } /* no pinning object, so the section is free */ if (!section->pin_queue_num_entries) { GCMemSection *to_free; g_assert (!section->pin_queue_start); if (prev_section) prev_section->block.next = section->block.next; else section_list = section->block.next; to_free = section; section = section->block.next; free_major_section (to_free); continue; } else { DEBUG (6, fprintf (gc_debug_file, "Section %p has still pinned objects (%d)\n", section, section->pin_queue_num_entries)); build_section_fragments (section); } prev_section = section; section = section->block.next; update: sgen_update_heap_boundaries ((mword)this_section->data, (mword)this_section->data + this_section->size); } have_swept = TRUE; }
static SgenPinnedChunk* alloc_pinned_chunk (SgenPinnedAllocator *alc) { SgenPinnedChunk *chunk; int offset; int size = SGEN_PINNED_CHUNK_SIZE; chunk = sgen_alloc_os_memory_aligned (size, size, TRUE); chunk->block.role = MEMORY_ROLE_PINNED; sgen_update_heap_boundaries ((mword)chunk, ((mword)chunk + size)); pinned_chunk_bytes_alloced += size; /* setup the bookeeping fields */ chunk->num_pages = size / FREELIST_PAGESIZE; offset = G_STRUCT_OFFSET (SgenPinnedChunk, data); chunk->page_sizes = (void*)((char*)chunk + offset); offset += sizeof (int) * chunk->num_pages; offset = SGEN_ALIGN_UP (offset); chunk->free_list = (void*)((char*)chunk + offset); offset += sizeof (void*) * SGEN_PINNED_FREELIST_NUM_SLOTS; offset = SGEN_ALIGN_UP (offset); chunk->start_data = (void*)((char*)chunk + offset); /* allocate the first page to the freelist */ chunk->page_sizes [0] = PINNED_FIRST_SLOT_SIZE; build_freelist (alc, chunk, slot_for_size (PINNED_FIRST_SLOT_SIZE), PINNED_FIRST_SLOT_SIZE, chunk->start_data, ((char*)chunk + FREELIST_PAGESIZE)); sgen_debug_printf (4, "Allocated pinned chunk %p, size: %d\n", chunk, size); chunk->block.next = alc->chunk_list; alc->chunk_list = chunk; chunk->allocator = alc; return chunk; }