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This commit is contained in:
John Coomes 2013-10-11 08:27:21 -07:00
commit e61cbf8d69
34 changed files with 2186 additions and 1042 deletions
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30
hotspot/src/os/linux/vm/os_linux.cpp
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@ -3361,13 +3361,15 @@ bool os::Linux::setup_large_page_type(size_t page_size) {
if (FLAG_IS_DEFAULT(UseHugeTLBFS) &&
FLAG_IS_DEFAULT(UseSHM) &&
FLAG_IS_DEFAULT(UseTransparentHugePages)) {
// If UseLargePages is specified on the command line try all methods,
// if it's default, then try only UseTransparentHugePages.
if (FLAG_IS_DEFAULT(UseLargePages)) {
UseTransparentHugePages = true;
} else {
UseHugeTLBFS = UseTransparentHugePages = UseSHM = true;
}
// The type of large pages has not been specified by the user.
// Try UseHugeTLBFS and then UseSHM.
UseHugeTLBFS = UseSHM = true;
// Don't try UseTransparentHugePages since there are known
// performance issues with it turned on. This might change in the future.
UseTransparentHugePages = false;
}
if (UseTransparentHugePages) {
@ -3393,9 +3395,19 @@ bool os::Linux::setup_large_page_type(size_t page_size) {
}
void os::large_page_init() {
if (!UseLargePages) {
UseHugeTLBFS = false;
if (!UseLargePages &&
!UseTransparentHugePages &&
!UseHugeTLBFS &&
!UseSHM) {
// Not using large pages.
return;
}
if (!FLAG_IS_DEFAULT(UseLargePages) && !UseLargePages) {
// The user explicitly turned off large pages.
// Ignore the rest of the large pages flags.
UseTransparentHugePages = false;
UseHugeTLBFS = false;
UseSHM = false;
return;
}