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8007074: SIGSEGV at ParMarkBitMap::verify_clear()

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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
This commit is contained in:
Stefan Karlsson 2013-08-16 13:22:32 +02:00
parent 6a548048a3
commit 7ade7987a0
20 changed files with 796 additions and 159 deletions
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9
hotspot/src/os/bsd/vm/os_bsd.cpp
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@ -2325,7 +2325,9 @@ void os::large_page_init() {
}
char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) {
char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
fatal("This code is not used or maintained.");
// "exec" is passed in but not used. Creating the shared image for
// the code cache doesn't have an SHM_X executable permission to check.
assert(UseLargePages && UseSHM, "only for SHM large pages");
@ -4752,3 +4754,8 @@ int os::get_core_path(char* buffer, size_t bufferSize) {
return n;
}
#ifndef PRODUCT
void TestReserveMemorySpecial_test() {
// No tests available for this platform
}
#endif