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src/share/vm/runtime/os.hpp
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rev 7654 : 8066875: VirtualSpace does not use large pages
rev 7655 : 8066875: VirtualSpace does not use large pages (01)
@@ -146,10 +146,11 @@
bool allow_exec);
static bool pd_unmap_memory(char *addr, size_t bytes);
static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
+ static size_t page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned);
public:
static void init(void); // Called before command line parsing
static void init_before_ergo(void); // Called after command line parsing
// before VM ergonomics processing.
@@ -265,12 +266,17 @@
// Return the default page size.
static int vm_page_size();
// Returns the page size to use for a region of memory.
// region_size / min_pages will always be greater than or equal to the
- // returned value.
- static size_t page_size_for_region(size_t region_size, size_t min_pages);
+ // returned value. The returned value will divide region_size.
+ static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages);
+
+ // Returns the page size to use for a region of memory.
+ // region_size / min_pages will always be greater than or equal to the
+ // returned value. The returned value might not divide region_size.
+ static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages);
// Return the largest page size that can be used
static size_t max_page_size() {
// The _page_sizes array is sorted in descending order.
return _page_sizes[0];
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