< prev index next >
src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.hpp
Print this page
rev 7618 : 8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
Summary: Making sure committed memory is cleared when re-committed, even if using large pages.
Reviewed-by:
rev 7619 : [mq]: clear-in-listener
@@ -47,10 +47,14 @@
size_t _page_size;
// Bitmap used for verification of commit/uncommit operations.
BitMap _committed;
+ // For _special spaces we need to keep track if the memory needs to be zeroed
+ // after commit or not.
+ BitMap _needs_zeroing;
+
// Indicates that the entire space has been committed and pinned in memory,
// os::commit_memory() or os::uncommit_memory() have no function.
bool _special;
// Indicates whether the committed space should be executable.
@@ -69,16 +73,15 @@
bool is_area_uncommitted(uintptr_t start, size_t size_in_pages) const;
public:
// Commit the given area of pages starting at start being size_in_pages large.
- MemRegion commit(uintptr_t start, size_t size_in_pages);
+ // Returns true if the given area is zero filled upon completion.
+ bool commit(uintptr_t start, size_t size_in_pages);
// Uncommit the given area of pages starting at start being size_in_pages large.
- MemRegion uncommit(uintptr_t start, size_t size_in_pages);
-
- bool special() const { return _special; }
+ void uncommit(uintptr_t start, size_t size_in_pages);
// Initialization
G1PageBasedVirtualSpace();
bool initialize_with_granularity(ReservedSpace rs, size_t page_size);
< prev index next >