Mercurial > hg > graal-compiler
diff src/os_cpu/solaris_sparc/vm/threadLS_solaris_sparc.hpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os_cpu/solaris_sparc/vm/threadLS_solaris_sparc.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,66 @@ +/* + * 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; + }