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comparison src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 942:2c79770d1f6e

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6819085: G1: use larger and/or user settable region size Summary: Instead of the region size being hard-coded, allow the user to set it. Reviewed-by: jmasa, johnc, apetrusenko
author tonyp
date Thu, 30 Jul 2009 16:22:58 -0400
parents 8b46c4d82093
children 54b3b351d6f9
comparison
equal deleted inserted replaced
941:8b46c4d82093 942:2c79770d1f6e
22 * 22 *
23 */ 23 */
24 24
25 #include "incls/_precompiled.incl" 25 #include "incls/_precompiled.incl"
26 #include "incls/_g1CollectedHeap.cpp.incl" 26 #include "incls/_g1CollectedHeap.cpp.incl"
27
28 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0;
27 29
28 // turn it on so that the contents of the young list (scan-only / 30 // turn it on so that the contents of the young list (scan-only /
29 // to-be-collected) are printed at "strategic" points before / during 31 // to-be-collected) are printed at "strategic" points before / during
30 // / after the collection --- this is useful for debugging 32 // / after the collection --- this is useful for debugging
31 #define SCAN_ONLY_VERBOSE 0 33 #define SCAN_ONLY_VERBOSE 0
1392 _dirty_cards_region_list(NULL) { 1394 _dirty_cards_region_list(NULL) {
1393 _g1h = this; // To catch bugs. 1395 _g1h = this; // To catch bugs.
1394 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { 1396 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) {
1395 vm_exit_during_initialization("Failed necessary allocation."); 1397 vm_exit_during_initialization("Failed necessary allocation.");
1396 } 1398 }
1399
1400 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2;
1401
1397 int n_queues = MAX2((int)ParallelGCThreads, 1); 1402 int n_queues = MAX2((int)ParallelGCThreads, 1);
1398 _task_queues = new RefToScanQueueSet(n_queues); 1403 _task_queues = new RefToScanQueueSet(n_queues);
1399 1404
1400 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); 1405 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets();
1401 assert(n_rem_sets > 0, "Invariant."); 1406 assert(n_rem_sets > 0, "Invariant.");
1544 // 6843694 - ensure that the maximum region index can fit 1549 // 6843694 - ensure that the maximum region index can fit
1545 // in the remembered set structures. 1550 // in the remembered set structures.
1546 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; 1551 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1;
1547 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); 1552 guarantee((max_regions() - 1) <= max_region_idx, "too many regions");
1548 1553
1549 const size_t cards_per_region = HeapRegion::GrainBytes >> CardTableModRefBS::card_shift;
1550 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; 1554 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1;
1551 guarantee(cards_per_region < max_cards_per_region, "too many cards per region"); 1555 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized");
1556 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region,
1557 "too many cards per region");
1552 1558
1553 _bot_shared = new G1BlockOffsetSharedArray(_reserved, 1559 _bot_shared = new G1BlockOffsetSharedArray(_reserved,
1554 heap_word_size(init_byte_size)); 1560 heap_word_size(init_byte_size));
1555 1561
1556 _g1h = this; 1562 _g1h = this;