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comparison src/share/vm/runtime/os.hpp @ 12110:4c84d351cca9

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8007074: SIGSEGV at ParMarkBitMap::verify_clear() Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages. Reviewed-by: tschatzl, dcubed, brutisso
author stefank
date Fri, 16 Aug 2013 13:22:32 +0200
parents af21010d1062
children 62f527c674d2 d8e99408faad
comparison
equal deleted inserted replaced
12108:badf4244ceae 12110:4c84d351cca9
326 static bool get_page_info(char *start, page_info* info); 326 static bool get_page_info(char *start, page_info* info);
327 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 327 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
328 328
329 static char* non_memory_address_word(); 329 static char* non_memory_address_word();
330 // reserve, commit and pin the entire memory region 330 // reserve, commit and pin the entire memory region
331 static char* reserve_memory_special(size_t size, char* addr = NULL, 331 static char* reserve_memory_special(size_t size, size_t alignment,
332 bool executable = false); 332 char* addr, bool executable);
333 static bool release_memory_special(char* addr, size_t bytes); 333 static bool release_memory_special(char* addr, size_t bytes);
334 static void large_page_init(); 334 static void large_page_init();
335 static size_t large_page_size(); 335 static size_t large_page_size();
336 static bool can_commit_large_page_memory(); 336 static bool can_commit_large_page_memory();
337 static bool can_execute_large_page_memory(); 337 static bool can_execute_large_page_memory();