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6819085: G1: use larger and/or user settable region size

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Instead of the region size being hard-coded, allow the user to set it.

Reviewed-by: jmasa, johnc, apetrusenko
This commit is contained in:
Antonios Printezis 2009-07-30 16:22:58 -04:00
parent c6763b5bad
commit 243367ec16
11 changed files with 125 additions and 41 deletions
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10
hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
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@ -25,6 +25,8 @@
#include "incls/_precompiled.incl"
#include "incls/_g1CollectedHeap.cpp.incl"
size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0;
// turn it on so that the contents of the young list (scan-only /
// to-be-collected) are printed at "strategic" points before / during
// / after the collection --- this is useful for debugging
@ -1394,6 +1396,9 @@ G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) :
if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) {
vm_exit_during_initialization("Failed necessary allocation.");
}
_humongous_object_threshold_in_words = HeapRegion::GrainWords / 2;
int n_queues = MAX2((int)ParallelGCThreads, 1);
_task_queues = new RefToScanQueueSet(n_queues);
@ -1546,9 +1551,10 @@ jint G1CollectedHeap::initialize() {
const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1;
guarantee((max_regions() - 1) <= max_region_idx, "too many regions");
const size_t cards_per_region = HeapRegion::GrainBytes >> CardTableModRefBS::card_shift;
size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1;
guarantee(cards_per_region < max_cards_per_region, "too many cards per region");
guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized");
guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region,
"too many cards per region");
_bot_shared = new G1BlockOffsetSharedArray(_reserved,
heap_word_size(init_byte_size));