Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/memory/metaspace.cpp
src/share/vm/memory/metaspace.cpp
- changeset 4813
- 6574f999e0cf
- parent 4791
- 47902e9acb3a
- parent 4804
- 91bf0bdae37b
- child 4932
- df254344edf1
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| 4801:59a41e1357ab | 4813:6574f999e0cf |
|---|---|
| 335 // byte_size is the size of the associated virtualspace. | 335 // byte_size is the size of the associated virtualspace. |
| 336 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) { | 336 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) { |
| 337 // align up to vm allocation granularity | 337 // align up to vm allocation granularity |
| 338 byte_size = align_size_up(byte_size, os::vm_allocation_granularity()); | 338 byte_size = align_size_up(byte_size, os::vm_allocation_granularity()); |
| 339 | 339 |
| 340 // This allocates memory with mmap. For DumpSharedspaces, allocate the | 340 // This allocates memory with mmap. For DumpSharedspaces, try to reserve |
| 341 // space at low memory so that other shared images don't conflict. | 341 // configurable address, generally at the top of the Java heap so other |
| 342 // This is the same address as memory needed for UseCompressedOops but | 342 // memory addresses don't conflict. |
| 343 // compressed oops don't work with CDS (offsets in metadata are wrong), so | |
| 344 // borrow the same address. | |
| 345 if (DumpSharedSpaces) { | 343 if (DumpSharedSpaces) { |
| 346 char* shared_base = (char*)HeapBaseMinAddress; | 344 char* shared_base = (char*)SharedBaseAddress; |
| 347 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); | 345 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); |
| 348 if (_rs.is_reserved()) { | 346 if (_rs.is_reserved()) { |
| 349 assert(_rs.base() == shared_base, "should match"); | 347 assert(shared_base == 0 || _rs.base() == shared_base, "should match"); |
| 350 } else { | 348 } else { |
| 351 // If we are dumping the heap, then allocate a wasted block of address | 349 // Get a mmap region anywhere if the SharedBaseAddress fails. |
| 352 // space in order to push the heap to a lower address. This extra | |
| 353 // address range allows for other (or larger) libraries to be loaded | |
| 354 // without them occupying the space required for the shared spaces. | |
| 355 uintx reserved = 0; | |
| 356 uintx block_size = 64*1024*1024; | |
| 357 while (reserved < SharedDummyBlockSize) { | |
| 358 char* dummy = os::reserve_memory(block_size); | |
| 359 reserved += block_size; | |
| 360 } | |
| 361 _rs = ReservedSpace(byte_size); | 350 _rs = ReservedSpace(byte_size); |
| 362 } | 351 } |
| 363 MetaspaceShared::set_shared_rs(&_rs); | 352 MetaspaceShared::set_shared_rs(&_rs); |
| 364 } else { | 353 } else { |
| 365 _rs = ReservedSpace(byte_size); | 354 _rs = ReservedSpace(byte_size); |
