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src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.hpp
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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
rev 7620 : [mq]: needs-zeroing-to-dirty
*** 47,56 ****
--- 47,62 ----
size_t _page_size;
// Bitmap used for verification of commit/uncommit operations.
BitMap _committed;
+ // Bitmap used to keep track of which pages are dirty or not for _special
+ // spaces. This is needed because for those spaces the underlying memory
+ // will only be zero filled the first time it is committed. Calls to commit
+ // will use this bitmap and return whether or not the memory is zero filled.
+ BitMap _dirty;
+
// 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.
*** 69,84 ****
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);
// 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; }
// Initialization
G1PageBasedVirtualSpace();
bool initialize_with_granularity(ReservedSpace rs, size_t page_size);
--- 75,89 ----
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.
! // 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.
! void uncommit(uintptr_t start, size_t size_in_pages);
// Initialization
G1PageBasedVirtualSpace();
bool initialize_with_granularity(ReservedSpace rs, size_t page_size);
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