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src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.hpp

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rev 6992 : 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: kbarrett, tschatzl

*** 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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