void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size) { // All space sizes must be multiples of car size in order for the CarTable to work. // Note that the CarTable is used with and without train gc (for fast lookup). uintx alignment = CarSpace::car_size(); // Compute sizes uintx size = _virtual_space.committed_size(); uintx survivor_size = compute_survivor_size(size, alignment); uintx eden_size = size - (2*survivor_size); assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); if (eden_size < minimum_eden_size) { // May happen due to 64Kb rounding, if so adjust eden size back up minimum_eden_size = align_size_up(minimum_eden_size, alignment); uintx maximum_survivor_size = (size - minimum_eden_size) / 2; uintx unaligned_survivor_size = align_size_down(maximum_survivor_size, alignment); survivor_size = MAX2(unaligned_survivor_size, alignment); eden_size = size - (2*survivor_size); assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); assert(eden_size >= minimum_eden_size, "just checking"); } char *eden_start = _virtual_space.low(); char *from_start = eden_start + eden_size; char *to_start = from_start + survivor_size; char *to_end = to_start + survivor_size; assert(to_end == _virtual_space.high(), "just checking"); assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment"); assert(Space::is_aligned((HeapWord*)from_start), "checking alignment"); assert(Space::is_aligned((HeapWord*)to_start), "checking alignment"); MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); eden()->initialize(edenMR, (minimum_eden_size == 0)); from()->initialize(fromMR, true); to()->initialize(toMR , true); if (jvmpi::is_event_enabled(JVMPI_EVENT_ARENA_NEW)) { CollectedHeap* ch = Universe::heap(); jvmpi::post_arena_new_event(ch->addr_to_arena_id(eden_start), "Eden"); jvmpi::post_arena_new_event(ch->addr_to_arena_id(from_start), "Semi"); jvmpi::post_arena_new_event(ch->addr_to_arena_id(to_start), "Semi"); } }
void DefNewGeneration::swap_spaces() { CollectedHeap* ch = Universe::heap(); if (jvmpi::is_event_enabled(JVMPI_EVENT_ARENA_DELETE)) { jvmpi::post_arena_delete_event(ch->addr_to_arena_id(from()->bottom())); } if (jvmpi::is_event_enabled(JVMPI_EVENT_ARENA_NEW)) { jvmpi::post_arena_new_event(ch->addr_to_arena_id(from()->bottom()), "Semi"); } ContiguousSpace* s = from(); _from_space = to(); _to_space = s; if (UsePerfData) { CSpaceCounters* c = _from_counters; _from_counters = _to_counters; _to_counters = c; } }