Mercurial > hg > truffle
view src/os_cpu/solaris_sparc/vm/threadLS_solaris_sparc.hpp @ 1352:895d9ade6111
Merge
author | asaha |
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date | Tue, 06 Apr 2010 22:06:57 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 1998-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ 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; }