Mercurial > hg > truffle
annotate src/share/vm/runtime/atomic.hpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
| author | ysr |
|---|---|
| date | Wed, 23 Dec 2009 09:23:54 -0800 |
| parents | 89e0543e1737 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 948 | 2 * Copyright 1999-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 class Atomic : AllStatic { | |
| 26 public: | |
| 27 // Atomically store to a location | |
| 28 static void store (jbyte store_value, jbyte* dest); | |
| 29 static void store (jshort store_value, jshort* dest); | |
| 30 static void store (jint store_value, jint* dest); | |
| 31 static void store (jlong store_value, jlong* dest); | |
| 32 static void store_ptr(intptr_t store_value, intptr_t* dest); | |
| 33 static void store_ptr(void* store_value, void* dest); | |
| 34 | |
| 35 static void store (jbyte store_value, volatile jbyte* dest); | |
| 36 static void store (jshort store_value, volatile jshort* dest); | |
| 37 static void store (jint store_value, volatile jint* dest); | |
| 38 static void store (jlong store_value, volatile jlong* dest); | |
| 39 static void store_ptr(intptr_t store_value, volatile intptr_t* dest); | |
| 40 static void store_ptr(void* store_value, volatile void* dest); | |
| 41 | |
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42 static jlong load(volatile jlong* src); |
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43 |
| 0 | 44 // Atomically add to a location, return updated value |
| 45 static jint add (jint add_value, volatile jint* dest); | |
| 46 static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest); | |
| 47 static void* add_ptr(intptr_t add_value, volatile void* dest); | |
| 48 | |
| 49 // Atomically increment location | |
| 50 static void inc (volatile jint* dest); | |
| 51 static void inc_ptr(volatile intptr_t* dest); | |
| 52 static void inc_ptr(volatile void* dest); | |
| 53 | |
| 54 // Atomically decrement a location | |
| 55 static void dec (volatile jint* dest); | |
| 56 static void dec_ptr(volatile intptr_t* dest); | |
| 57 static void dec_ptr(volatile void* dest); | |
| 58 | |
| 59 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest. | |
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60 static jint xchg(jint exchange_value, volatile jint* dest); |
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61 static unsigned int xchg(unsigned int exchange_value, |
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62 volatile unsigned int* dest); |
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63 |
| 0 | 64 static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest); |
| 65 static void* xchg_ptr(void* exchange_value, volatile void* dest); | |
| 66 | |
| 67 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value | |
| 68 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory | |
| 69 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'. | |
| 70 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value); | |
| 71 static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value); | |
| 72 static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value); | |
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73 |
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74 static unsigned int cmpxchg(unsigned int exchange_value, |
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75 volatile unsigned int* dest, |
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76 unsigned int compare_value); |
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77 |
| 0 | 78 static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value); |
| 79 static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value); | |
| 80 }; |