Mercurial > hg > graal-compiler
annotate src/share/vm/code/codeCache.hpp @ 1202:5f24d0319e54
4360113: Evict nmethods when code cache gets full
Summary: Speculatively unload the oldest nmethods when code cache gets full.
Reviewed-by: never, kvn
Contributed-by: eric.caspole@amd.com
| author | kvn |
|---|---|
| date | Fri, 29 Jan 2010 09:27:22 -0800 |
| parents | 148e5441d916 |
| children | bfe29ec02863 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 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 // The CodeCache implements the code cache for various pieces of generated | |
| 26 // code, e.g., compiled java methods, runtime stubs, transition frames, etc. | |
| 27 // The entries in the CodeCache are all CodeBlob's. | |
| 28 | |
| 29 // Implementation: | |
| 30 // - Each CodeBlob occupies one chunk of memory. | |
| 31 // - Like the offset table in oldspace the zone has at table for | |
| 32 // locating a method given a addess of an instruction. | |
| 33 | |
| 34 class OopClosure; | |
| 35 class DepChange; | |
| 36 | |
| 37 class CodeCache : AllStatic { | |
| 38 friend class VMStructs; | |
| 39 private: | |
| 40 // CodeHeap is malloc()'ed at startup and never deleted during shutdown, | |
| 41 // so that the generated assembly code is always there when it's needed. | |
| 42 // This may cause memory leak, but is necessary, for now. See 4423824, | |
| 43 // 4422213 or 4436291 for details. | |
| 44 static CodeHeap * _heap; | |
| 45 static int _number_of_blobs; | |
| 46 static int _number_of_nmethods_with_dependencies; | |
| 47 static bool _needs_cache_clean; | |
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48 static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link() |
| 1202 | 49 static nmethod* _saved_nmethods; // linked via nm->saved_nmethod_look() |
| 0 | 50 |
| 51 static void verify_if_often() PRODUCT_RETURN; | |
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52 |
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53 static void mark_scavenge_root_nmethods() PRODUCT_RETURN; |
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54 static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN; |
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55 |
| 0 | 56 public: |
| 57 | |
| 58 // Initialization | |
| 59 static void initialize(); | |
| 60 | |
| 61 // Allocation/administration | |
| 62 static CodeBlob* allocate(int size); // allocates a new CodeBlob | |
| 63 static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled | |
| 64 static int alignment_unit(); // guaranteed alignment of all CodeBlobs | |
| 65 static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header) | |
| 66 static void free(CodeBlob* cb); // frees a CodeBlob | |
| 67 static void flush(); // flushes all CodeBlobs | |
| 68 static bool contains(void *p); // returns whether p is included | |
| 69 static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs | |
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70 static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs |
| 0 | 71 static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods |
| 72 | |
| 73 // Lookup | |
| 74 static CodeBlob* find_blob(void* start); | |
| 75 static nmethod* find_nmethod(void* start); | |
| 76 | |
| 77 // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know | |
| 78 // what you are doing) | |
| 79 static CodeBlob* find_blob_unsafe(void* start) { | |
| 80 CodeBlob* result = (CodeBlob*)_heap->find_start(start); | |
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81 // this assert is too strong because the heap code will return the |
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82 // heapblock containing start. That block can often be larger than |
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83 // the codeBlob itself. If you look up an address that is within |
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84 // the heapblock but not in the codeBlob you will assert. |
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85 // |
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86 // Most things will not lookup such bad addresses. However |
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87 // AsyncGetCallTrace can see intermediate frames and get that kind |
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88 // of invalid address and so can a developer using hsfind. |
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89 // |
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90 // The more correct answer is to return NULL if blob_contains() returns |
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91 // false. |
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92 // assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob"); |
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93 |
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94 if (result != NULL && !result->blob_contains((address)start)) { |
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95 result = NULL; |
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96 } |
| 0 | 97 return result; |
| 98 } | |
| 99 | |
| 100 // Iteration | |
| 101 static CodeBlob* first(); | |
| 102 static CodeBlob* next (CodeBlob* cb); | |
| 103 static CodeBlob* alive(CodeBlob *cb); | |
| 104 static nmethod* alive_nmethod(CodeBlob *cb); | |
| 105 static int nof_blobs() { return _number_of_blobs; } | |
| 106 | |
| 107 // GC support | |
| 108 static void gc_epilogue(); | |
| 109 static void gc_prologue(); | |
| 110 // If "unloading_occurred" is true, then unloads (i.e., breaks root links | |
| 111 // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading" | |
| 112 // to "true" iff some code got unloaded. | |
| 113 static void do_unloading(BoolObjectClosure* is_alive, | |
| 114 OopClosure* keep_alive, | |
| 115 bool unloading_occurred); | |
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116 static void oops_do(OopClosure* f) { |
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117 CodeBlobToOopClosure oopc(f, /*do_marking=*/ false); |
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118 blobs_do(&oopc); |
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119 } |
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120 static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN; |
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121 static void scavenge_root_nmethods_do(CodeBlobClosure* f); |
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122 |
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123 static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; } |
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124 static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; } |
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125 static void add_scavenge_root_nmethod(nmethod* nm); |
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126 static void drop_scavenge_root_nmethod(nmethod* nm); |
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127 static void prune_scavenge_root_nmethods(); |
| 0 | 128 |
| 129 // Printing/debugging | |
| 130 static void print() PRODUCT_RETURN; // prints summary | |
| 131 static void print_internals(); | |
| 132 static void verify(); // verifies the code cache | |
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133 static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN; |
| 0 | 134 |
| 135 // The full limits of the codeCache | |
| 136 static address low_bound() { return (address) _heap->low_boundary(); } | |
| 137 static address high_bound() { return (address) _heap->high_boundary(); } | |
| 138 | |
| 139 // Profiling | |
| 140 static address first_address(); // first address used for CodeBlobs | |
| 141 static address last_address(); // last address used for CodeBlobs | |
| 142 static size_t capacity() { return _heap->capacity(); } | |
| 143 static size_t max_capacity() { return _heap->max_capacity(); } | |
| 144 static size_t unallocated_capacity() { return _heap->unallocated_capacity(); } | |
| 1202 | 145 static bool needs_flushing() { return unallocated_capacity() < CodeCacheFlushingMinimumFreeSpace; } |
| 0 | 146 |
| 147 static bool needs_cache_clean() { return _needs_cache_clean; } | |
| 148 static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; } | |
| 149 static void clear_inline_caches(); // clear all inline caches | |
| 150 | |
| 1202 | 151 static nmethod* find_and_remove_saved_code(methodOop m); |
| 152 static void remove_saved_code(nmethod* nm); | |
| 153 static void speculatively_disconnect(nmethod* nm); | |
| 154 | |
| 0 | 155 // Deoptimization |
| 156 static int mark_for_deoptimization(DepChange& changes); | |
| 157 #ifdef HOTSWAP | |
| 158 static int mark_for_evol_deoptimization(instanceKlassHandle dependee); | |
| 159 #endif // HOTSWAP | |
| 160 | |
| 161 static void mark_all_nmethods_for_deoptimization(); | |
| 162 static int mark_for_deoptimization(methodOop dependee); | |
| 163 static void make_marked_nmethods_zombies(); | |
| 164 static void make_marked_nmethods_not_entrant(); | |
| 165 | |
| 166 // tells how many nmethods have dependencies | |
| 167 static int number_of_nmethods_with_dependencies(); | |
| 168 }; |