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annotate src/share/vm/memory/gcLocker.hpp @ 4873:0382d2b469b2

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7013347: allow crypto functions to be called inline to enhance performance Reviewed-by: kvn
author never
date Wed, 01 Feb 2012 16:57:08 -0800
parents 1a2723f7ad8e
children 09d00c18e323
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1 /*
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_MEMORY_GCLOCKER_HPP
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26 #define SHARE_VM_MEMORY_GCLOCKER_HPP
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27
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28 #include "gc_interface/collectedHeap.hpp"
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29 #include "memory/genCollectedHeap.hpp"
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30 #include "memory/universe.hpp"
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31 #include "oops/oop.hpp"
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32 #ifdef TARGET_OS_FAMILY_linux
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33 # include "os_linux.inline.hpp"
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34 # include "thread_linux.inline.hpp"
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35 #endif
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36 #ifdef TARGET_OS_FAMILY_solaris
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37 # include "os_solaris.inline.hpp"
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38 # include "thread_solaris.inline.hpp"
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39 #endif
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40 #ifdef TARGET_OS_FAMILY_windows
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41 # include "os_windows.inline.hpp"
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42 # include "thread_windows.inline.hpp"
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43 #endif
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44 #ifdef TARGET_OS_FAMILY_bsd
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45 # include "os_bsd.inline.hpp"
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46 # include "thread_bsd.inline.hpp"
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47 #endif
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48
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49 // The direct lock/unlock calls do not force a collection if an unlock
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50 // decrements the count to zero. Avoid calling these if at all possible.
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51
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52 class GC_locker: public AllStatic {
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53 private:
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54 // The _jni_lock_count keeps track of the number of threads that are
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55 // currently in a critical region. It's only kept up to date when
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56 // _needs_gc is true. The current value is computed during
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57 // safepointing and decremented during the slow path of GC_locker
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58 // unlocking.
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59 static volatile jint _jni_lock_count; // number of jni active instances.
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60
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61 static volatile jint _lock_count; // number of other active instances
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62 static volatile bool _needs_gc; // heap is filling, we need a GC
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63 // note: bool is typedef'd as jint
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64 static volatile bool _doing_gc; // unlock_critical() is doing a GC
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65
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66 static jlong _wait_begin; // Timestamp for the setting of _needs_gc.
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67 // Used only by printing code.
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68
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69 #ifdef ASSERT
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70 // This lock count is updated for all operations and is used to
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71 // validate the jni_lock_count that is computed during safepoints.
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72 static volatile jint _debug_jni_lock_count;
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73 #endif
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74
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75 // Accessors
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76 static bool is_jni_active() {
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77 assert(_needs_gc, "only valid when _needs_gc is set");
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78 return _jni_lock_count > 0;
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79 }
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80
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81 // At a safepoint, visit all threads and count the number of active
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82 // critical sections. This is used to ensure that all active
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83 // critical sections are exited before a new one is started.
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84 static void verify_critical_count() NOT_DEBUG_RETURN;
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85
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86 static void jni_lock(JavaThread* thread);
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87 static void jni_unlock(JavaThread* thread);
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88
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89 public:
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90 // Accessors
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91 static bool is_active();
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92 static bool needs_gc() { return _needs_gc; }
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93
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94 // Shorthand
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95 static bool is_active_and_needs_gc() { return needs_gc() && is_active(); }
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96
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97 // In debug mode track the locking state at all times
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98 static void increment_debug_jni_lock_count() {
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99 #ifdef ASSERT
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100 assert(_debug_jni_lock_count >= 0, "bad value");
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101 Atomic::inc(&_debug_jni_lock_count);
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102 #endif
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103 }
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104 static void decrement_debug_jni_lock_count() {
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105 #ifdef ASSERT
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106 assert(_debug_jni_lock_count > 0, "bad value");
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107 Atomic::dec(&_debug_jni_lock_count);
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108 #endif
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109 }
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110
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111 // Set the current lock count
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112 static void set_jni_lock_count(int count) {
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113 _jni_lock_count = count;
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114 verify_critical_count();
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115 }
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116
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117 // Sets _needs_gc if is_active() is true. Returns is_active().
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118 static bool check_active_before_gc();
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119
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120 // Stalls the caller (who should not be in a jni critical section)
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121 // until needs_gc() clears. Note however that needs_gc() may be
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122 // set at a subsequent safepoint and/or cleared under the
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123 // JNICritical_lock, so the caller may not safely assert upon
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124 // return from this method that "!needs_gc()" since that is
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125 // not a stable predicate.
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126 static void stall_until_clear();
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127
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128 // Non-structured GC locking: currently needed for JNI. Use with care!
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129 static void lock();
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130 static void unlock();
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131
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132 // The following two methods are used for JNI critical regions.
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133 // If we find that we failed to perform a GC because the GC_locker
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134 // was active, arrange for one as soon as possible by allowing
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135 // all threads in critical regions to complete, but not allowing
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136 // other critical regions to be entered. The reasons for that are:
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137 // 1) a GC request won't be starved by overlapping JNI critical
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138 // region activities, which can cause unnecessary OutOfMemory errors.
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139 // 2) even if allocation requests can still be satisfied before GC locker
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140 // becomes inactive, for example, in tenured generation possibly with
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141 // heap expansion, those allocations can trigger lots of safepointing
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142 // attempts (ineffective GC attempts) and require Heap_lock which
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143 // slow down allocations tremendously.
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144 //
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145 // Note that critical regions can be nested in a single thread, so
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146 // we must allow threads already in critical regions to continue.
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147 //
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148 // JNI critical regions are the only participants in this scheme
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149 // because they are, by spec, well bounded while in a critical region.
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150 //
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151 // Each of the following two method is split into a fast path and a
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152 // slow path. JNICritical_lock is only grabbed in the slow path.
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153 // _needs_gc is initially false and every java thread will go
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154 // through the fast path, which simply increments or decrements the
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155 // current thread's critical count. When GC happens at a safepoint,
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156 // GC_locker::is_active() is checked. Since there is no safepoint in
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157 // the fast path of lock_critical() and unlock_critical(), there is
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158 // no race condition between the fast path and GC. After _needs_gc
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159 // is set at a safepoint, every thread will go through the slow path
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160 // after the safepoint. Since after a safepoint, each of the
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161 // following two methods is either entered from the method entry and
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162 // falls into the slow path, or is resumed from the safepoints in
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163 // the method, which only exist in the slow path. So when _needs_gc
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164 // is set, the slow path is always taken, till _needs_gc is cleared.
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165 static void lock_critical(JavaThread* thread);
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166 static void unlock_critical(JavaThread* thread);
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167
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168 static address needs_gc_address() { return (address) &_needs_gc; }
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169 };
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170
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171
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172 // A No_GC_Verifier object can be placed in methods where one assumes that
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173 // no garbage collection will occur. The destructor will verify this property
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174 // unless the constructor is called with argument false (not verifygc).
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175 //
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176 // The check will only be done in debug mode and if verifygc true.
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177
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178 class No_GC_Verifier: public StackObj {
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179 friend class Pause_No_GC_Verifier;
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180
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181 protected:
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182 bool _verifygc;
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183 unsigned int _old_invocations;
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184
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185 public:
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186 #ifdef ASSERT
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187 No_GC_Verifier(bool verifygc = true);
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188 ~No_GC_Verifier();
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189 #else
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190 No_GC_Verifier(bool verifygc = true) {}
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191 ~No_GC_Verifier() {}
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192 #endif
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193 };
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194
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195 // A Pause_No_GC_Verifier is used to temporarily pause the behavior
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196 // of a No_GC_Verifier object. If we are not in debug mode or if the
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197 // No_GC_Verifier object has a _verifygc value of false, then there
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198 // is nothing to do.
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199
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200 class Pause_No_GC_Verifier: public StackObj {
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201 private:
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202 No_GC_Verifier * _ngcv;
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203
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204 public:
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205 #ifdef ASSERT
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206 Pause_No_GC_Verifier(No_GC_Verifier * ngcv);
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207 ~Pause_No_GC_Verifier();
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208 #else
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209 Pause_No_GC_Verifier(No_GC_Verifier * ngcv) {}
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210 ~Pause_No_GC_Verifier() {}
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211 #endif
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212 };
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213
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214
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215 // A No_Safepoint_Verifier object will throw an assertion failure if
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216 // the current thread passes a possible safepoint while this object is
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217 // instantiated. A safepoint, will either be: an oop allocation, blocking
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218 // on a Mutex or JavaLock, or executing a VM operation.
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219 //
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220 // If StrictSafepointChecks is turned off, it degrades into a No_GC_Verifier
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221 //
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222 class No_Safepoint_Verifier : public No_GC_Verifier {
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223 friend class Pause_No_Safepoint_Verifier;
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224
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225 private:
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226 bool _activated;
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227 Thread *_thread;
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228 public:
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229 #ifdef ASSERT
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230 No_Safepoint_Verifier(bool activated = true, bool verifygc = true ) :
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231 No_GC_Verifier(verifygc),
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232 _activated(activated) {
0
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233 _thread = Thread::current();
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234 if (_activated) {
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235 _thread->_allow_allocation_count++;
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236 _thread->_allow_safepoint_count++;
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237 }
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238 }
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239
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240 ~No_Safepoint_Verifier() {
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241 if (_activated) {
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242 _thread->_allow_allocation_count--;
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243 _thread->_allow_safepoint_count--;
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244 }
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245 }
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246 #else
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247 No_Safepoint_Verifier(bool activated = true, bool verifygc = true) : No_GC_Verifier(verifygc){}
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248 ~No_Safepoint_Verifier() {}
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249 #endif
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250 };
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251
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252 // A Pause_No_Safepoint_Verifier is used to temporarily pause the
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253 // behavior of a No_Safepoint_Verifier object. If we are not in debug
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254 // mode then there is nothing to do. If the No_Safepoint_Verifier
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255 // object has an _activated value of false, then there is nothing to
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256 // do for safepoint and allocation checking, but there may still be
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257 // something to do for the underlying No_GC_Verifier object.
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258
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259 class Pause_No_Safepoint_Verifier : public Pause_No_GC_Verifier {
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260 private:
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261 No_Safepoint_Verifier * _nsv;
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262
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263 public:
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264 #ifdef ASSERT
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265 Pause_No_Safepoint_Verifier(No_Safepoint_Verifier * nsv)
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266 : Pause_No_GC_Verifier(nsv) {
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267
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268 _nsv = nsv;
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269 if (_nsv->_activated) {
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270 _nsv->_thread->_allow_allocation_count--;
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271 _nsv->_thread->_allow_safepoint_count--;
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272 }
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273 }
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274
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275 ~Pause_No_Safepoint_Verifier() {
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276 if (_nsv->_activated) {
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277 _nsv->_thread->_allow_allocation_count++;
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278 _nsv->_thread->_allow_safepoint_count++;
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279 }
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280 }
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281 #else
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282 Pause_No_Safepoint_Verifier(No_Safepoint_Verifier * nsv)
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283 : Pause_No_GC_Verifier(nsv) {}
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284 ~Pause_No_Safepoint_Verifier() {}
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285 #endif
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286 };
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287
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288 // A SkipGCALot object is used to elide the usual effect of gc-a-lot
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289 // over a section of execution by a thread. Currently, it's used only to
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290 // prevent re-entrant calls to GC.
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291 class SkipGCALot : public StackObj {
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292 private:
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293 bool _saved;
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294 Thread* _t;
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295
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296 public:
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297 #ifdef ASSERT
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298 SkipGCALot(Thread* t) : _t(t) {
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299 _saved = _t->skip_gcalot();
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300 _t->set_skip_gcalot(true);
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301 }
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302
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303 ~SkipGCALot() {
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304 assert(_t->skip_gcalot(), "Save-restore protocol invariant");
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305 _t->set_skip_gcalot(_saved);
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306 }
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307 #else
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308 SkipGCALot(Thread* t) { }
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309 ~SkipGCALot() { }
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310 #endif
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311 };
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312
0
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313 // JRT_LEAF currently can be called from either _thread_in_Java or
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314 // _thread_in_native mode. In _thread_in_native, it is ok
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315 // for another thread to trigger GC. The rest of the JRT_LEAF
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316 // rules apply.
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317 class JRT_Leaf_Verifier : public No_Safepoint_Verifier {
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318 static bool should_verify_GC();
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319 public:
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320 #ifdef ASSERT
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321 JRT_Leaf_Verifier();
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322 ~JRT_Leaf_Verifier();
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323 #else
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324 JRT_Leaf_Verifier() {}
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325 ~JRT_Leaf_Verifier() {}
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326 #endif
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327 };
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328
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329 // A No_Alloc_Verifier object can be placed in methods where one assumes that
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330 // no allocation will occur. The destructor will verify this property
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331 // unless the constructor is called with argument false (not activated).
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332 //
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333 // The check will only be done in debug mode and if activated.
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334 // Note: this only makes sense at safepoints (otherwise, other threads may
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335 // allocate concurrently.)
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336
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337 class No_Alloc_Verifier : public StackObj {
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338 private:
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339 bool _activated;
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340
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341 public:
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342 #ifdef ASSERT
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343 No_Alloc_Verifier(bool activated = true) {
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344 _activated = activated;
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345 if (_activated) Thread::current()->_allow_allocation_count++;
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346 }
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347
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348 ~No_Alloc_Verifier() {
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349 if (_activated) Thread::current()->_allow_allocation_count--;
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350 }
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351 #else
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352 No_Alloc_Verifier(bool activated = true) {}
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353 ~No_Alloc_Verifier() {}
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354 #endif
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355 };
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356
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357 #endif // SHARE_VM_MEMORY_GCLOCKER_HPP