jdk8-mips64-public/hotspot: src/os_cpu/solaris_sparc/vm/threadLS_solaris

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

     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  */

    25 #ifndef OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP

    26 #define OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP

    28 public:

    29   // Java Thread  - force inlining

    30   static inline Thread* thread() ;

    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);

    36   NOT_PRODUCT(static int _tcacheHit;)

    37   NOT_PRODUCT(static int _tcacheMiss;)

    39 public:

    41   // Print cache hit/miss statistics

    42   static void print_statistics() PRODUCT_RETURN;

    44   enum Constants {

    45     _pd_cache_size         =  256*2  // projected typical # of threads * 2

    46   };

    48   static void set_thread_in_slot (Thread *) ;

    50   static uintptr_t pd_raw_thread_id() {

    51     return _raw_thread_id();

    52   }

    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   }

    71 #endif // OS_CPU_SOLARIS_SPARC_VM_THREADLS_SOLARIS_SPARC_HPP

src/os_cpu/solaris_sparc/vm/threadLS_solaris_sparc.hpp@f90c822e73f8