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().
57 #if defined(COMPILER1) || defined(COMPILER2) 58 define_pd_global(intx, InlineSmallCode, 1500); 59 #endif 60 61 define_pd_global(bool, RewriteBytecodes, true); 62 define_pd_global(bool, RewriteFrequentPairs, true); 63 64 define_pd_global(bool, PreserveFramePointer, false); 65 66 // GC Ergo Flags 67 define_pd_global(size_t, CMSYoungGenPerWorker, 16*M); // default max size of CMS young gen, per GC worker thread 68 69 define_pd_global(uintx, TypeProfileLevel, 0); 70 71 // No performance work done here yet. 72 define_pd_global(bool, CompactStrings, false); 73 74 define_pd_global(intx, InitArrayShortSize, 8*BytesPerLong); 75 76 define_pd_global(bool, ThreadLocalHandshakes, false); 77 78 #define ARCH_FLAGS(develop, \ 79 product, \ 80 diagnostic, \ 81 experimental, \ 82 notproduct, \ 83 range, \ 84 constraint, \ 85 writeable) 86 #endif // CPU_ARM_GLOBALS_ARM_HPP | 57 #if defined(COMPILER1) || defined(COMPILER2) 58 define_pd_global(intx, InlineSmallCode, 1500); 59 #endif 60 61 define_pd_global(bool, RewriteBytecodes, true); 62 define_pd_global(bool, RewriteFrequentPairs, true); 63 64 define_pd_global(bool, PreserveFramePointer, false); 65 66 // GC Ergo Flags 67 define_pd_global(size_t, CMSYoungGenPerWorker, 16*M); // default max size of CMS young gen, per GC worker thread 68 69 define_pd_global(uintx, TypeProfileLevel, 0); 70 71 // No performance work done here yet. 72 define_pd_global(bool, CompactStrings, false); 73 74 define_pd_global(intx, InitArrayShortSize, 8*BytesPerLong); 75 76 define_pd_global(bool, ThreadLocalHandshakes, false); 77 // ObjectMonitor ref_count not implemented in C2 fast_lock() or 78 // fast_unlock() so use a handshake for safety. 79 // Will use a safepoint instead of a handshake on this platform. 80 define_pd_global(bool, HandshakeAfterDeflateIdleMonitors, true); 81 82 #define ARCH_FLAGS(develop, \ 83 product, \ 84 diagnostic, \ 85 experimental, \ 86 notproduct, \ 87 range, \ 88 constraint, \ 89 writeable) 90 #endif // CPU_ARM_GLOBALS_ARM_HPP |