size_t ThreadLocalAllocBuffer::initial_desired_size() { size_t init_sz = 0; if (TLABSize > 0) { init_sz = TLABSize / HeapWordSize; } else if (global_stats() != NULL) { // Initial size is a function of the average number of allocating threads. unsigned nof_threads = global_stats()->allocating_threads_avg(); init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / (nof_threads * target_refills()); init_sz = align_object_size(init_sz); } init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); return init_sz; }
void ThreadLocalAllocBuffer::initialize() { initialize(NULL, // start NULL, // top NULL); // end set_desired_size(initial_desired_size()); // Following check is needed because at startup the main (primordial) // thread is initialized before the heap is. The initialization for // this thread is redone in startup_initialization below. if (Universe::heap() != NULL) { size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; double alloc_frac = desired_size() * target_refills() / (double) capacity; _allocation_fraction.sample(alloc_frac); } set_refill_waste_limit(initial_refill_waste_limit()); initialize_statistics(); }