242 assert(requested_eden_size > 0 && requested_survivor_size > 0,
243 "just checking");
244 CollectedHeap* heap = Universe::heap();
245 assert(heap->kind() == CollectedHeap::GenCollectedHeap, "Sanity");
246
247
248 // We require eden and to space to be empty
249 if ((!eden()->is_empty()) || (!to()->is_empty())) {
250 return;
251 }
252
253 size_t cur_eden_size = eden()->capacity();
254
255 if (PrintAdaptiveSizePolicy && Verbose) {
256 gclog_or_tty->print_cr("ASParNew::resize_spaces(requested_eden_size: "
257 SIZE_FORMAT
258 ", requested_survivor_size: " SIZE_FORMAT ")",
259 requested_eden_size, requested_survivor_size);
260 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") "
261 SIZE_FORMAT,
262 eden()->bottom(),
263 eden()->end(),
264 pointer_delta(eden()->end(),
265 eden()->bottom(),
266 sizeof(char)));
267 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") "
268 SIZE_FORMAT,
269 from()->bottom(),
270 from()->end(),
271 pointer_delta(from()->end(),
272 from()->bottom(),
273 sizeof(char)));
274 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") "
275 SIZE_FORMAT,
276 to()->bottom(),
277 to()->end(),
278 pointer_delta( to()->end(),
279 to()->bottom(),
280 sizeof(char)));
281 }
282
283 // There's nothing to do if the new sizes are the same as the current
284 if (requested_survivor_size == to()->capacity() &&
285 requested_survivor_size == from()->capacity() &&
286 requested_eden_size == eden()->capacity()) {
287 if (PrintAdaptiveSizePolicy && Verbose) {
288 gclog_or_tty->print_cr(" capacities are the right sizes, returning");
289 }
290 return;
291 }
292
293 char* eden_start = (char*)eden()->bottom();
294 char* eden_end = (char*)eden()->end();
295 char* from_start = (char*)from()->bottom();
296 char* from_end = (char*)from()->end();
297 char* to_start = (char*)to()->bottom();
365 // Now update to_start with the new from_end
366 to_start = MAX2(from_end, to_start);
367 } else {
368 // If shrinking, move to-space down to abut the end of from-space
369 // so that shrinking will move to-space down. If not shrinking
370 // to-space is moving up to allow for growth on the next expansion.
371 if (requested_eden_size <= cur_eden_size) {
372 to_start = from_end;
373 if (to_start + requested_survivor_size > to_start) {
374 to_end = to_start + requested_survivor_size;
375 }
376 }
377 // else leave to_end pointing to the high end of the virtual space.
378 }
379
380 guarantee(to_start != to_end, "to space is zero sized");
381
382 if (PrintAdaptiveSizePolicy && Verbose) {
383 gclog_or_tty->print_cr(" [eden_start .. eden_end): "
384 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
385 eden_start,
386 eden_end,
387 pointer_delta(eden_end, eden_start, sizeof(char)));
388 gclog_or_tty->print_cr(" [from_start .. from_end): "
389 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
390 from_start,
391 from_end,
392 pointer_delta(from_end, from_start, sizeof(char)));
393 gclog_or_tty->print_cr(" [ to_start .. to_end): "
394 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
395 to_start,
396 to_end,
397 pointer_delta( to_end, to_start, sizeof(char)));
398 }
399 } else {
400 // Eden, to, from
401 if (PrintAdaptiveSizePolicy && Verbose) {
402 gclog_or_tty->print_cr(" Eden, to, from:");
403 }
404
405 // Calculate the to-space boundaries based on
406 // the start of from-space.
407 to_end = from_start;
408 to_start = (char*)pointer_delta(from_start,
409 (char*)requested_survivor_size,
410 sizeof(char));
411 // Calculate the ideal eden boundaries.
412 // eden_end is already at the bottom of the generation
413 assert(eden_start == virtual_space()->low(),
414 "Eden is not starting at the low end of the virtual space");
415 if (eden_start + requested_eden_size >= eden_start) {
416 eden_end = eden_start + requested_eden_size;
456
457 // eden_end may have moved so again make sure
458 // the to-space and eden don't overlap.
459 to_start = MAX2(eden_end, to_start);
460
461 // from-space
462 size_t from_used = from()->used();
463 if (requested_survivor_size > from_used) {
464 if (from_start + requested_survivor_size >= from_start) {
465 from_end = from_start + requested_survivor_size;
466 }
467 if (from_end > virtual_space()->high()) {
468 from_end = virtual_space()->high();
469 }
470 }
471
472 assert(to_start >= eden_end, "to-space should be above eden");
473 if (PrintAdaptiveSizePolicy && Verbose) {
474 gclog_or_tty->print_cr(" [eden_start .. eden_end): "
475 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
476 eden_start,
477 eden_end,
478 pointer_delta(eden_end, eden_start, sizeof(char)));
479 gclog_or_tty->print_cr(" [ to_start .. to_end): "
480 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
481 to_start,
482 to_end,
483 pointer_delta( to_end, to_start, sizeof(char)));
484 gclog_or_tty->print_cr(" [from_start .. from_end): "
485 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
486 from_start,
487 from_end,
488 pointer_delta(from_end, from_start, sizeof(char)));
489 }
490 }
491
492
493 guarantee((HeapWord*)from_start <= from()->bottom(),
494 "from start moved to the right");
495 guarantee((HeapWord*)from_end >= from()->top(),
496 "from end moved into live data");
497 assert(is_object_aligned((intptr_t)eden_start), "checking alignment");
498 assert(is_object_aligned((intptr_t)from_start), "checking alignment");
499 assert(is_object_aligned((intptr_t)to_start), "checking alignment");
500
501 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end);
502 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end);
503 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end);
504
505 // Let's make sure the call to initialize doesn't reset "top"!
506 HeapWord* old_from_top = from()->top();
507
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242 assert(requested_eden_size > 0 && requested_survivor_size > 0,
243 "just checking");
244 CollectedHeap* heap = Universe::heap();
245 assert(heap->kind() == CollectedHeap::GenCollectedHeap, "Sanity");
246
247
248 // We require eden and to space to be empty
249 if ((!eden()->is_empty()) || (!to()->is_empty())) {
250 return;
251 }
252
253 size_t cur_eden_size = eden()->capacity();
254
255 if (PrintAdaptiveSizePolicy && Verbose) {
256 gclog_or_tty->print_cr("ASParNew::resize_spaces(requested_eden_size: "
257 SIZE_FORMAT
258 ", requested_survivor_size: " SIZE_FORMAT ")",
259 requested_eden_size, requested_survivor_size);
260 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") "
261 SIZE_FORMAT,
262 p2i(eden()->bottom()),
263 p2i(eden()->end()),
264 pointer_delta(eden()->end(),
265 eden()->bottom(),
266 sizeof(char)));
267 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") "
268 SIZE_FORMAT,
269 p2i(from()->bottom()),
270 p2i(from()->end()),
271 pointer_delta(from()->end(),
272 from()->bottom(),
273 sizeof(char)));
274 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") "
275 SIZE_FORMAT,
276 p2i(to()->bottom()),
277 p2i(to()->end()),
278 pointer_delta( to()->end(),
279 to()->bottom(),
280 sizeof(char)));
281 }
282
283 // There's nothing to do if the new sizes are the same as the current
284 if (requested_survivor_size == to()->capacity() &&
285 requested_survivor_size == from()->capacity() &&
286 requested_eden_size == eden()->capacity()) {
287 if (PrintAdaptiveSizePolicy && Verbose) {
288 gclog_or_tty->print_cr(" capacities are the right sizes, returning");
289 }
290 return;
291 }
292
293 char* eden_start = (char*)eden()->bottom();
294 char* eden_end = (char*)eden()->end();
295 char* from_start = (char*)from()->bottom();
296 char* from_end = (char*)from()->end();
297 char* to_start = (char*)to()->bottom();
365 // Now update to_start with the new from_end
366 to_start = MAX2(from_end, to_start);
367 } else {
368 // If shrinking, move to-space down to abut the end of from-space
369 // so that shrinking will move to-space down. If not shrinking
370 // to-space is moving up to allow for growth on the next expansion.
371 if (requested_eden_size <= cur_eden_size) {
372 to_start = from_end;
373 if (to_start + requested_survivor_size > to_start) {
374 to_end = to_start + requested_survivor_size;
375 }
376 }
377 // else leave to_end pointing to the high end of the virtual space.
378 }
379
380 guarantee(to_start != to_end, "to space is zero sized");
381
382 if (PrintAdaptiveSizePolicy && Verbose) {
383 gclog_or_tty->print_cr(" [eden_start .. eden_end): "
384 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
385 p2i(eden_start),
386 p2i(eden_end),
387 pointer_delta(eden_end, eden_start, sizeof(char)));
388 gclog_or_tty->print_cr(" [from_start .. from_end): "
389 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
390 p2i(from_start),
391 p2i(from_end),
392 pointer_delta(from_end, from_start, sizeof(char)));
393 gclog_or_tty->print_cr(" [ to_start .. to_end): "
394 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
395 p2i(to_start),
396 p2i(to_end),
397 pointer_delta( to_end, to_start, sizeof(char)));
398 }
399 } else {
400 // Eden, to, from
401 if (PrintAdaptiveSizePolicy && Verbose) {
402 gclog_or_tty->print_cr(" Eden, to, from:");
403 }
404
405 // Calculate the to-space boundaries based on
406 // the start of from-space.
407 to_end = from_start;
408 to_start = (char*)pointer_delta(from_start,
409 (char*)requested_survivor_size,
410 sizeof(char));
411 // Calculate the ideal eden boundaries.
412 // eden_end is already at the bottom of the generation
413 assert(eden_start == virtual_space()->low(),
414 "Eden is not starting at the low end of the virtual space");
415 if (eden_start + requested_eden_size >= eden_start) {
416 eden_end = eden_start + requested_eden_size;
456
457 // eden_end may have moved so again make sure
458 // the to-space and eden don't overlap.
459 to_start = MAX2(eden_end, to_start);
460
461 // from-space
462 size_t from_used = from()->used();
463 if (requested_survivor_size > from_used) {
464 if (from_start + requested_survivor_size >= from_start) {
465 from_end = from_start + requested_survivor_size;
466 }
467 if (from_end > virtual_space()->high()) {
468 from_end = virtual_space()->high();
469 }
470 }
471
472 assert(to_start >= eden_end, "to-space should be above eden");
473 if (PrintAdaptiveSizePolicy && Verbose) {
474 gclog_or_tty->print_cr(" [eden_start .. eden_end): "
475 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
476 p2i(eden_start),
477 p2i(eden_end),
478 pointer_delta(eden_end, eden_start, sizeof(char)));
479 gclog_or_tty->print_cr(" [ to_start .. to_end): "
480 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
481 p2i(to_start),
482 p2i(to_end),
483 pointer_delta( to_end, to_start, sizeof(char)));
484 gclog_or_tty->print_cr(" [from_start .. from_end): "
485 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
486 p2i(from_start),
487 p2i(from_end),
488 pointer_delta(from_end, from_start, sizeof(char)));
489 }
490 }
491
492
493 guarantee((HeapWord*)from_start <= from()->bottom(),
494 "from start moved to the right");
495 guarantee((HeapWord*)from_end >= from()->top(),
496 "from end moved into live data");
497 assert(is_object_aligned((intptr_t)eden_start), "checking alignment");
498 assert(is_object_aligned((intptr_t)from_start), "checking alignment");
499 assert(is_object_aligned((intptr_t)to_start), "checking alignment");
500
501 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end);
502 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end);
503 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end);
504
505 // Let's make sure the call to initialize doesn't reset "top"!
506 HeapWord* old_from_top = from()->top();
507
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