8313782: Add user-facing warning if THPs are enabled but cannot be used

Reviewed-by: dholmes, sjohanss
This commit is contained in:
Thomas Stuefe 2023-08-15 09:09:02 +00:00
parent f4e72c58d7
commit dff99f7f3d

@ -3793,15 +3793,17 @@ void os::large_page_init() {
return;
}
// 2) check if large pages are configured
if ( ( UseTransparentHugePages && HugePages::supports_thp() == false) ||
(!UseTransparentHugePages && HugePages::supports_static_hugepages() == false) ) {
// No large pages configured, return.
// 2) check if the OS supports THPs resp. static hugepages.
if (UseTransparentHugePages && !HugePages::supports_thp()) {
if (!FLAG_IS_DEFAULT(UseTransparentHugePages)) {
log_warning(pagesize)("UseTransparentHugePages disabled, transparent huge pages are not supported by the operating system.");
}
UseLargePages = UseTransparentHugePages = UseHugeTLBFS = UseSHM = false;
return;
}
if (!UseTransparentHugePages && !HugePages::supports_static_hugepages()) {
warn_no_large_pages_configured();
UseLargePages = false;
UseTransparentHugePages = false;
UseHugeTLBFS = false;
UseSHM = false;
UseLargePages = UseTransparentHugePages = UseHugeTLBFS = UseSHM = false;
return;
}