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src/hotspot/cpu/aarch64/globals_aarch64.hpp

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rev 56639 : loosen a couple more counter checks due to races observed in testing; simplify om_release() extraction of mid since list head or cur_mid_in_use is marked; simplify deflate_monitor_list() extraction of mid since there are no parallel deleters due to the safepoint; simplify deflate_monitor_list_using_JT() extraction of mid since list head or cur_mid_in_use is marked; prepend_block_to_lists() - simplify based on David H's comments; does not need load_acquire() or release_store() because of the cmpxchg(); prepend_to_common() - simplify to use mark_next_loop() for m and use mark_list_head() and release_store() for the non-empty list case; add more debugging for "Non-balanced monitor enter/exit" failure mode; fix race in inflate() in the "CASE: neutral" code path; install_displaced_markword_in_object() does not need to clear the header field since that is handled when the ObjectMonitor is moved from the global free list; LSuccess should clear boxReg to set ICC.ZF=1 to avoid depending on existing boxReg contents; update fast_unlock() to detect when object no longer refers to the same ObjectMonitor and take fast path exit instead; clarify fast_lock() code where we detect when object no longer refers to the same ObjectMonitor; add/update comments for movptr() calls where we move a literal into an Address; remove set_owner(); refactor setting of owner field into set_owner_from(2 versions), set_owner_from_BasicLock(), and try_set_owner_from(); the new functions include monitorinflation+owner logging; extract debug code from v2.06 and v2.07 and move to v2.07.debug; change 'jccb' -> 'jcc' and 'jmpb' -> 'jmp' as needed; checkpoint initial version of MacroAssembler::inc_om_ref_count(); update LP64 MacroAssembler::fast_lock() and fast_unlock() to use inc_om_ref_count(); fast_lock() return flag setting logic can use 'testptr(tmpReg, tmpReg)' instead of 'cmpptr(tmpReg, 0)' since that's more efficient; fast_unlock() LSuccess return flag setting logic can use 'testl (boxReg, 0)' instead of 'xorptr(boxReg, boxReg)' since that's more efficient; cleanup "fast-path" vs "fast path" and "slow-path" vs "slow path"; update MacroAssembler::rtm_inflated_locking() to use inc_om_ref_count(); update MacroAssembler::fast_lock() to preserve the flags before decrementing ref_count and restore the flags afterwards; this is more clean than depending on the contents of rax/tmpReg; coleenp CR - refactor async monitor deflation work from ServiceThread::service_thread_entry() to ObjectSynchronizer::deflate_idle_monitors_using_JT(); rehn,eosterlund CR - add support for HandshakeAfterDeflateIdleMonitors for platforms that don't have ObjectMonitor ref_count support implemented in C2 fast_lock() and fast_unlock().


  58 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  59 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  60 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  61 
  62 define_pd_global(bool, RewriteBytecodes,     true);
  63 define_pd_global(bool, RewriteFrequentPairs, true);
  64 
  65 define_pd_global(bool, PreserveFramePointer, false);
  66 
  67 // GC Ergo Flags
  68 define_pd_global(uintx, CMSYoungGenPerWorker, 64*M);  // default max size of CMS young gen, per GC worker thread
  69 
  70 define_pd_global(uintx, TypeProfileLevel, 111);
  71 
  72 define_pd_global(bool, CompactStrings, true);
  73 
  74 // Clear short arrays bigger than one word in an arch-specific way
  75 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
  76 
  77 define_pd_global(bool, ThreadLocalHandshakes, true);



  78 
  79 #if defined(COMPILER1) || defined(COMPILER2)
  80 define_pd_global(intx, InlineSmallCode,          1000);
  81 #endif
  82 
  83 #define ARCH_FLAGS(develop, \
  84                    product, \
  85                    diagnostic, \
  86                    experimental, \
  87                    notproduct, \
  88                    range, \
  89                    constraint, \
  90                    writeable) \
  91                                                                         \
  92   product(bool, NearCpool, true,                                        \
  93          "constant pool is close to instructions")                      \
  94                                                                         \
  95   product(bool, UseBarriersForVolatile, false,                          \
  96           "Use memory barriers to implement volatile accesses")         \
  97   product(bool, UseNeon, false,                                         \




  58 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  59 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  60 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  61 
  62 define_pd_global(bool, RewriteBytecodes,     true);
  63 define_pd_global(bool, RewriteFrequentPairs, true);
  64 
  65 define_pd_global(bool, PreserveFramePointer, false);
  66 
  67 // GC Ergo Flags
  68 define_pd_global(uintx, CMSYoungGenPerWorker, 64*M);  // default max size of CMS young gen, per GC worker thread
  69 
  70 define_pd_global(uintx, TypeProfileLevel, 111);
  71 
  72 define_pd_global(bool, CompactStrings, true);
  73 
  74 // Clear short arrays bigger than one word in an arch-specific way
  75 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
  76 
  77 define_pd_global(bool, ThreadLocalHandshakes, true);
  78 // ObjectMonitor ref_count not implemented in C2 fast_lock() or
  79 // fast_unlock() so use a handshake for safety.
  80 define_pd_global(bool, HandshakeAfterDeflateIdleMonitors, true);
  81 
  82 #if defined(COMPILER1) || defined(COMPILER2)
  83 define_pd_global(intx, InlineSmallCode,          1000);
  84 #endif
  85 
  86 #define ARCH_FLAGS(develop, \
  87                    product, \
  88                    diagnostic, \
  89                    experimental, \
  90                    notproduct, \
  91                    range, \
  92                    constraint, \
  93                    writeable) \
  94                                                                         \
  95   product(bool, NearCpool, true,                                        \
  96          "constant pool is close to instructions")                      \
  97                                                                         \
  98   product(bool, UseBarriersForVolatile, false,                          \
  99           "Use memory barriers to implement volatile accesses")         \
 100   product(bool, UseNeon, false,                                         \
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