src/hotspot/cpu/x86/globalDefinitions_x86.hpp

rev 56637 : Add OM_CACHE_LINE_SIZE so that ObjectMonitor cache line sizes can be experimented with independently of DEFAULT_CACHE_LINE_SIZE; for SPARC and X64 configs that use 128 for DEFAULT_CACHE_LINE_SIZE, we are experimenting with 64; move _previous_owner_tid and _allocation_state fields to share the cache line with ObjectMonitor::_header; put ObjectMonitor::_ref_count on its own cache line after _owner; add 'int* count_p' parameter to deflate_monitor_list() and deflate_monitor_list_using_JT() and push counter updates down to where the ObjectMonitors are actually removed from the in-use lists; monitors_iterate() async deflation check should use negative ref_count; add 'JavaThread* target' param to deflate_per_thread_idle_monitors_using_JT() add deflate_common_idle_monitors_using_JT() to make it clear which JavaThread* is the target of the work and which is the calling JavaThread* (self); g_free_list, g_om_in_use_list and g_om_in_use_count are now static to synchronizer.cpp (reduce scope); add more diagnostic info to some assert()'s; minor code cleanups and code motion; save_om_ptr() should detect a race with a deflating thread that is bailing out and cause a retry when the ref_count field is not positive; merge with jdk-14+11; add special GC support for TestHumongousClassLoader.java; merge with 8230184.patch; merge with jdk-14+14; merge with jdk-14+18.

@@ -38,10 +38,11 @@
 // The expected size in bytes of a cache line, used to pad data structures.
 #if defined(TIERED)
   #ifdef _LP64
     // tiered, 64-bit, large machine
     #define DEFAULT_CACHE_LINE_SIZE 128
+    #define OM_CACHE_LINE_SIZE 64
   #else
     // tiered, 32-bit, medium machine
     #define DEFAULT_CACHE_LINE_SIZE 64
   #endif
 #elif defined(COMPILER1)

@@ -50,10 +51,11 @@
   #define DEFAULT_CACHE_LINE_SIZE 32
 #elif defined(COMPILER2)
   #ifdef _LP64
     // pure C2, 64-bit, large machine
     #define DEFAULT_CACHE_LINE_SIZE 128
+    #define OM_CACHE_LINE_SIZE 64
   #else
     // pure C2, 32-bit, medium machine
     #define DEFAULT_CACHE_LINE_SIZE 64
   #endif
 #endif