8313782: Add user-facing warning if THPs are enabled but cannot be used
Reviewed-by: dholmes, sjohanss
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@ -3793,15 +3793,17 @@ void os::large_page_init() {
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return;
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}
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// 2) check if large pages are configured
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if ( ( UseTransparentHugePages && HugePages::supports_thp() == false) ||
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(!UseTransparentHugePages && HugePages::supports_static_hugepages() == false) ) {
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// No large pages configured, return.
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// 2) check if the OS supports THPs resp. static hugepages.
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if (UseTransparentHugePages && !HugePages::supports_thp()) {
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if (!FLAG_IS_DEFAULT(UseTransparentHugePages)) {
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log_warning(pagesize)("UseTransparentHugePages disabled, transparent huge pages are not supported by the operating system.");
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}
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UseLargePages = UseTransparentHugePages = UseHugeTLBFS = UseSHM = false;
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return;
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}
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if (!UseTransparentHugePages && !HugePages::supports_static_hugepages()) {
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warn_no_large_pages_configured();
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UseLargePages = false;
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UseTransparentHugePages = false;
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UseHugeTLBFS = false;
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UseSHM = false;
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UseLargePages = UseTransparentHugePages = UseHugeTLBFS = UseSHM = false;
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return;
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}
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