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comparison: src/os_cpu/solaris_sparc/vm/threadLS_solaris_sparc.hpp
src/os_cpu/solaris_sparc/vm/threadLS_solaris_sparc.hpp
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| 1 /* | |
| 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP | |
| 26 #define OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP | |
| 27 | |
| 28 public: | |
| 29 // Java Thread - force inlining | |
| 30 static inline Thread* thread() ; | |
| 31 | |
| 32 private: | |
| 33 static Thread* _get_thread_cache[]; // index by [(raw_id>>9)^(raw_id>>20) % _pd_cache_size] | |
| 34 static Thread* get_thread_via_cache_slowly(uintptr_t raw_id, int index); | |
| 35 | |
| 36 NOT_PRODUCT(static int _tcacheHit;) | |
| 37 NOT_PRODUCT(static int _tcacheMiss;) | |
| 38 | |
| 39 public: | |
| 40 | |
| 41 // Print cache hit/miss statistics | |
| 42 static void print_statistics() PRODUCT_RETURN; | |
| 43 | |
| 44 enum Constants { | |
| 45 _pd_cache_size = 256*2 // projected typical # of threads * 2 | |
| 46 }; | |
| 47 | |
| 48 static void set_thread_in_slot (Thread *) ; | |
| 49 | |
| 50 static uintptr_t pd_raw_thread_id() { | |
| 51 return _raw_thread_id(); | |
| 52 } | |
| 53 | |
| 54 static int pd_cache_index(uintptr_t raw_id) { | |
| 55 // Hash function: From email from Dave: | |
| 56 // The hash function deserves an explanation. %g7 points to libthread's | |
| 57 // "thread" structure. On T1 the thread structure is allocated on the | |
| 58 // user's stack (yes, really!) so the ">>20" handles T1 where the JVM's | |
| 59 // stack size is usually >= 1Mb. The ">>9" is for T2 where Roger allocates | |
| 60 // globs of thread blocks contiguously. The "9" has to do with the | |
| 61 // expected size of the T2 thread structure. If these constants are wrong | |
| 62 // the worst thing that'll happen is that the hit rate for heavily threaded | |
| 63 // apps won't be as good as it could be. If you want to burn another | |
| 64 // shift+xor you could mix together _all of the %g7 bits to form the hash, | |
| 65 // but I think that's excessive. Making the change above changed the | |
| 66 // T$ miss rate on SpecJBB (on a 16X system) from about 3% to imperceptible. | |
| 67 uintptr_t ix = (int) (((raw_id >> 9) ^ (raw_id >> 20)) % _pd_cache_size); | |
| 68 return ix; | |
| 69 } | |
| 70 | |
| 71 #endif // OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP |
