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7040485: Use transparent huge page on linux by default

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Turn on UseLargePages by default but try only HugeTLBFS method if it is not explicitly specified on the command line.

Reviewed-by: ysr
This commit is contained in:
Igor Veresov 2011-04-29 12:39:32 -07:00
parent 5b3550c107
commit 2abb1bbd58
5 changed files with 20 additions and 23 deletions
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22
hotspot/src/os/linux/vm/os_linux.cpp
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@ -2914,16 +2914,21 @@ static void set_coredump_filter(void) {
static size_t _large_page_size = 0;
bool os::large_page_init() {
void os::large_page_init() {
if (!UseLargePages) {
UseHugeTLBFS = false;
UseSHM = false;
return false;
return;
}
if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) {
// Our user has not expressed a preference, so we'll try both.
UseHugeTLBFS = UseSHM = true;
// If UseLargePages is specified on the command line try both methods,
// if it's default, then try only HugeTLBFS.
if (FLAG_IS_DEFAULT(UseLargePages)) {
UseHugeTLBFS = true;
} else {
UseHugeTLBFS = UseSHM = true;
}
}
if (LargePageSizeInBytes) {
@ -2978,7 +2983,6 @@ bool os::large_page_init() {
_page_sizes[1] = default_page_size;
_page_sizes[2] = 0;
}
UseHugeTLBFS = UseHugeTLBFS &&
Linux::hugetlbfs_sanity_check(warn_on_failure, _large_page_size);
@ -2988,12 +2992,6 @@ bool os::large_page_init() {
UseLargePages = UseHugeTLBFS || UseSHM;
set_coredump_filter();
// Large page support is available on 2.6 or newer kernel, some vendors
// (e.g. Redhat) have backported it to their 2.4 based distributions.
// We optimistically assume the support is available. If later it turns out
// not true, VM will automatically switch to use regular page size.
return true;
}
#ifndef SHM_HUGETLB
@ -4118,7 +4116,7 @@ jint os::init_2(void)
#endif
}
FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
os::large_page_init();
// initialize suspend/resume support - must do this before signal_sets_init()
if (SR_initialize() != 0) {