291 bool PSOldGen::expand_to_reserved() {
292 assert_lock_strong(ExpandHeap_lock);
293 assert_locked_or_safepoint(Heap_lock);
294
295 bool result = true;
296 const size_t remaining_bytes = virtual_space()->uncommitted_size();
297 if (remaining_bytes > 0) {
298 result = expand_by(remaining_bytes);
299 DEBUG_ONLY(if (!result) warning("grow to reserve failed"));
300 }
301 return result;
302 }
303
304 void PSOldGen::shrink(size_t bytes) {
305 assert_lock_strong(ExpandHeap_lock);
306 assert_locked_or_safepoint(Heap_lock);
307
308 size_t size = align_size_down(bytes, virtual_space()->alignment());
309 if (size > 0) {
310 assert_lock_strong(ExpandHeap_lock);
311 virtual_space()->shrink_by(bytes);
312 post_resize();
313
314 if (Verbose && PrintGC) {
315 size_t new_mem_size = virtual_space()->committed_size();
316 size_t old_mem_size = new_mem_size + bytes;
317 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K by "
318 SIZE_FORMAT "K to "
319 SIZE_FORMAT "K",
320 name(), old_mem_size/K, bytes/K, new_mem_size/K);
321 }
322 }
323 }
324
325 void PSOldGen::resize(size_t desired_free_space) {
326 const size_t alignment = virtual_space()->alignment();
327 const size_t size_before = virtual_space()->committed_size();
328 size_t new_size = used_in_bytes() + desired_free_space;
329 if (new_size < used_in_bytes()) {
330 // Overflowed the addition.
331 new_size = gen_size_limit();
332 }
333 // Adjust according to our min and max
334 new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size());
335
336 assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?");
337 new_size = align_size_up(new_size, alignment);
338
339 const size_t current_size = capacity_in_bytes();
340
480 _gen(gen), _start_array(start_array) { }
481
482 virtual void do_object(oop obj) {
483 HeapWord* test_addr = (HeapWord*)obj + 1;
484 guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object");
485 guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation");
486 }
487 };
488
489 void PSOldGen::verify_object_start_array() {
490 VerifyObjectStartArrayClosure check( this, &_start_array );
491 object_iterate(&check);
492 }
493
494 #ifndef PRODUCT
495 void PSOldGen::record_spaces_top() {
496 assert(ZapUnusedHeapArea, "Not mangling unused space");
497 object_space()->set_top_for_allocations();
498 }
499 #endif
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291 bool PSOldGen::expand_to_reserved() {
292 assert_lock_strong(ExpandHeap_lock);
293 assert_locked_or_safepoint(Heap_lock);
294
295 bool result = true;
296 const size_t remaining_bytes = virtual_space()->uncommitted_size();
297 if (remaining_bytes > 0) {
298 result = expand_by(remaining_bytes);
299 DEBUG_ONLY(if (!result) warning("grow to reserve failed"));
300 }
301 return result;
302 }
303
304 void PSOldGen::shrink(size_t bytes) {
305 assert_lock_strong(ExpandHeap_lock);
306 assert_locked_or_safepoint(Heap_lock);
307
308 size_t size = align_size_down(bytes, virtual_space()->alignment());
309 if (size > 0) {
310 assert_lock_strong(ExpandHeap_lock);
311 virtual_space()->shrink_by(size);
312 post_resize();
313
314 if (Verbose && PrintGC) {
315 size_t new_mem_size = virtual_space()->committed_size();
316 size_t old_mem_size = new_mem_size + size;
317 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K by "
318 SIZE_FORMAT "K to "
319 SIZE_FORMAT "K",
320 name(), old_mem_size/K, size/K, new_mem_size/K);
321 }
322 }
323 }
324
325 void PSOldGen::resize(size_t desired_free_space) {
326 const size_t alignment = virtual_space()->alignment();
327 const size_t size_before = virtual_space()->committed_size();
328 size_t new_size = used_in_bytes() + desired_free_space;
329 if (new_size < used_in_bytes()) {
330 // Overflowed the addition.
331 new_size = gen_size_limit();
332 }
333 // Adjust according to our min and max
334 new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size());
335
336 assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?");
337 new_size = align_size_up(new_size, alignment);
338
339 const size_t current_size = capacity_in_bytes();
340
480 _gen(gen), _start_array(start_array) { }
481
482 virtual void do_object(oop obj) {
483 HeapWord* test_addr = (HeapWord*)obj + 1;
484 guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object");
485 guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation");
486 }
487 };
488
489 void PSOldGen::verify_object_start_array() {
490 VerifyObjectStartArrayClosure check( this, &_start_array );
491 object_iterate(&check);
492 }
493
494 #ifndef PRODUCT
495 void PSOldGen::record_spaces_top() {
496 assert(ZapUnusedHeapArea, "Not mangling unused space");
497 object_space()->set_top_for_allocations();
498 }
499 #endif
500
501 void PSOldGen::try_to_expand_by(size_t expand_bytes) {
502 if (expand_bytes < MinHeapDeltaBytes ||
503 capacity_in_bytes() + expand_bytes > max_gen_size()) {
504 return;
505 }
506
507 if (PrintGC) {
508 gclog_or_tty->print_cr(" Resizing old gen. expand_bytes=%d", expand_bytes);
509 gclog_or_tty->print("BEFORE: Old Gen: ");
510 gclog_or_tty->print("capacity : " SIZE_FORMAT ", ", capacity_in_bytes());
511 gclog_or_tty->print_cr("used : " SIZE_FORMAT ", " , used_in_bytes());
512 }
513
514 expand(expand_bytes);
515
516 if (PrintGC) {
517 gclog_or_tty->print("AFTER: Old Gen: ");
518 gclog_or_tty->print("capacity : " SIZE_FORMAT ", ", capacity_in_bytes());
519 gclog_or_tty->print_cr("used : " SIZE_FORMAT ", " , used_in_bytes());
520 }
521 }
522
523 void PSOldGen::try_to_shrink_by(size_t shrink_bytes) {
524 if (shrink_bytes < MinHeapDeltaBytes ||
525 capacity_in_bytes() - shrink_bytes < init_gen_size()) {
526 return;
527 }
528
529 if (PrintGC) {
530 gclog_or_tty->print_cr(" Resizing old gen. shrink_bytes=%d", shrink_bytes);
531 gclog_or_tty->print("BEFORE: Old Gen: ");
532 gclog_or_tty->print("capacity : " SIZE_FORMAT ", ", capacity_in_bytes());
533 gclog_or_tty->print_cr("used : " SIZE_FORMAT ", " , used_in_bytes());
534 }
535
536 MutexLocker x(ExpandHeap_lock);
537 shrink(shrink_bytes);
538
539 if (PrintGC) {
540 gclog_or_tty->print("AFTER: Old Gen: ");
541 gclog_or_tty->print("capacity : " SIZE_FORMAT ", ", capacity_in_bytes());
542 gclog_or_tty->print_cr("used : " SIZE_FORMAT ", " , used_in_bytes());
543 }
544 }
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