| /* |
| * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP |
| #define OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP |
| |
| public: |
| // Java Thread - force inlining |
| static inline Thread* thread() ; |
| |
| private: |
| static Thread* _get_thread_cache[]; // index by [(raw_id>>9)^(raw_id>>20) % _pd_cache_size] |
| static Thread* get_thread_via_cache_slowly(uintptr_t raw_id, int index); |
| |
| NOT_PRODUCT(static int _tcacheHit;) |
| NOT_PRODUCT(static int _tcacheMiss;) |
| |
| public: |
| |
| // Print cache hit/miss statistics |
| static void print_statistics() PRODUCT_RETURN; |
| |
| enum Constants { |
| _pd_cache_size = 256*2 // projected typical # of threads * 2 |
| }; |
| |
| static void set_thread_in_slot (Thread *) ; |
| |
| static uintptr_t pd_raw_thread_id() { |
| return _raw_thread_id(); |
| } |
| |
| static int pd_cache_index(uintptr_t raw_id) { |
| // Hash function: From email from Dave: |
| // The hash function deserves an explanation. %g7 points to libthread's |
| // "thread" structure. On T1 the thread structure is allocated on the |
| // user's stack (yes, really!) so the ">>20" handles T1 where the JVM's |
| // stack size is usually >= 1Mb. The ">>9" is for T2 where Roger allocates |
| // globs of thread blocks contiguously. The "9" has to do with the |
| // expected size of the T2 thread structure. If these constants are wrong |
| // the worst thing that'll happen is that the hit rate for heavily threaded |
| // apps won't be as good as it could be. If you want to burn another |
| // shift+xor you could mix together _all of the %g7 bits to form the hash, |
| // but I think that's excessive. Making the change above changed the |
| // T$ miss rate on SpecJBB (on a 16X system) from about 3% to imperceptible. |
| uintptr_t ix = (int) (((raw_id >> 9) ^ (raw_id >> 20)) % _pd_cache_size); |
| return ix; |
| } |
| |
| #endif // OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP |