src/hotspot/cpu/x86/globals_x86.hpp

rev 57595 : v2.09a with 8235795, 8235931 and 8236035 extracted; rebased to jdk-14+28; merge with 8236035.patch.cr1; merge with 8235795.patch.cr1; merge with 8236035.patch.cr2; merge with 8235795.patch.cr2; merge with 8235795.patch.cr3.

@@ -87,10 +87,25 @@
 
 define_pd_global(bool, PreserveFramePointer, false);
 
 define_pd_global(intx, InitArrayShortSize, 8*BytesPerLong);
 
+#if defined(_LP64) || defined(_WINDOWS)
+// ObjectMonitor ref_count is implemented in LP64 C2 fast_lock()
+// and fast_unlock() so we don't need the handshake by default.
+#ifdef _LP64
+define_pd_global(bool, HandshakeAfterDeflateIdleMonitors, false);
+#else
+define_pd_global(bool, HandshakeAfterDeflateIdleMonitors, true);
+#endif
+#else
+// ObjectMonitor ref_count not implemented in C2 fast_lock() or
+// fast_unlock() so use a handshake for safety.
+// Will use a safepoint instead of a handshake on this platform.
+define_pd_global(bool, HandshakeAfterDeflateIdleMonitors, true);
+#endif
+
 #define ARCH_FLAGS(develop, \
                    product, \
                    diagnostic, \
                    experimental, \
                    notproduct, \