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comparison src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 642:660978a2a31a

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6791178: Specialize for zero as the compressed oop vm heap base Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb. Reviewed-by: never, twisti, jcoomes, coleenp
author kvn
date Thu, 12 Mar 2009 10:37:46 -0700
parents bcedf688d882
children bd441136a5ce
comparison
equal deleted inserted replaced
641:6af0a709d52b 642:660978a2a31a
1358 _cg1r = new ConcurrentG1Refine(); 1358 _cg1r = new ConcurrentG1Refine();
1359 1359
1360 // Reserve the maximum. 1360 // Reserve the maximum.
1361 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); 1361 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation();
1362 // Includes the perm-gen. 1362 // Includes the perm-gen.
1363
1364 const size_t total_reserved = max_byte_size + pgs->max_size();
1365 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop);
1366
1363 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), 1367 ReservedSpace heap_rs(max_byte_size + pgs->max_size(),
1364 HeapRegion::GrainBytes, 1368 HeapRegion::GrainBytes,
1365 false /*ism*/); 1369 false /*ism*/, addr);
1370
1371 if (UseCompressedOops) {
1372 if (addr != NULL && !heap_rs.is_reserved()) {
1373 // Failed to reserve at specified address - the requested memory
1374 // region is taken already, for example, by 'java' launcher.
1375 // Try again to reserver heap higher.
1376 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop);
1377 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes,
1378 false /*ism*/, addr);
1379 if (addr != NULL && !heap_rs0.is_reserved()) {
1380 // Failed to reserve at specified address again - give up.
1381 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop);
1382 assert(addr == NULL, "");
1383 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes,
1384 false /*ism*/, addr);
1385 heap_rs = heap_rs1;
1386 } else {
1387 heap_rs = heap_rs0;
1388 }
1389 }
1390 }
1366 1391
1367 if (!heap_rs.is_reserved()) { 1392 if (!heap_rs.is_reserved()) {
1368 vm_exit_during_initialization("Could not reserve enough space for object heap"); 1393 vm_exit_during_initialization("Could not reserve enough space for object heap");
1369 return JNI_ENOMEM; 1394 return JNI_ENOMEM;
1370 } 1395 }