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comparison src/os/windows/vm/os_windows.cpp @ 3318:188c9a5d6a6d

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7040485: Use transparent huge page on linux by default Summary: Turn on UseLargePages by default but try only HugeTLBFS method if it is not explicitly specified on the command line. Reviewed-by: ysr
author iveresov
date Fri, 29 Apr 2011 12:39:32 -0700
parents 5504afd15955
children 7c948af3e651 bf6481e5f96d
comparison
equal deleted inserted replaced
3315:da0fffdcc453 3318:188c9a5d6a6d
2760 _hProcess = NULL; 2760 _hProcess = NULL;
2761 if (_hToken) CloseHandle(_hToken); 2761 if (_hToken) CloseHandle(_hToken);
2762 _hToken = NULL; 2762 _hToken = NULL;
2763 } 2763 }
2764 2764
2765 bool os::large_page_init() { 2765 void os::large_page_init() {
2766 if (!UseLargePages) return false; 2766 if (!UseLargePages) return;
2767 2767
2768 // print a warning if any large page related flag is specified on command line 2768 // print a warning if any large page related flag is specified on command line
2769 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2769 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2770 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2770 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2771 bool success = false; 2771 bool success = false;
2806 _page_sizes[1] = default_page_size; 2806 _page_sizes[1] = default_page_size;
2807 _page_sizes[2] = 0; 2807 _page_sizes[2] = 0;
2808 } 2808 }
2809 2809
2810 cleanup_after_large_page_init(); 2810 cleanup_after_large_page_init();
2811 return success; 2811 UseLargePages = success;
2812 } 2812 }
2813 2813
2814 // On win32, one cannot release just a part of reserved memory, it's an 2814 // On win32, one cannot release just a part of reserved memory, it's an
2815 // all or nothing deal. When we split a reservation, we must break the 2815 // all or nothing deal. When we split a reservation, we must break the
2816 // reservation into two reservations. 2816 // reservation into two reservations.
3559 if(Verbose && PrintMiscellaneous) 3559 if(Verbose && PrintMiscellaneous)
3560 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3560 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3561 #endif 3561 #endif
3562 } 3562 }
3563 3563
3564 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3564 os::large_page_init();
3565 3565
3566 // Setup Windows Exceptions 3566 // Setup Windows Exceptions
3567 3567
3568 // On Itanium systems, Structured Exception Handling does not 3568 // On Itanium systems, Structured Exception Handling does not
3569 // work since stack frames must be walkable by the OS. Since 3569 // work since stack frames must be walkable by the OS. Since