Mercurial > hg > truffle
annotate src/share/vm/runtime/sweeper.hpp @ 10206:0cfa93c2fcc4
8012547: Code cache flushing can get stuck reclaming of memory
Summary: Keep sweeping regardless of if we are flushing
Reviewed-by: kvn, twisti
author | neliasso |
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date | Mon, 29 Apr 2013 13:20:19 +0200 |
parents | da91efe96a93 |
children | f2110083203d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP |
26 #define SHARE_VM_RUNTIME_SWEEPER_HPP | |
27 | |
0 | 28 // An NmethodSweeper is an incremental cleaner for: |
29 // - cleanup inline caches | |
30 // - reclamation of unreferences zombie nmethods | |
31 // | |
32 | |
33 class NMethodSweeper : public AllStatic { | |
34 static long _traversals; // Stack traversal count | |
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35 static nmethod* _current; // Current nmethod |
0 | 36 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
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37 |
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38 static volatile int _invocations; // No. of invocations left until we are completed with this pass |
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39 static volatile int _sweep_started; // Flag to control conc sweeper |
0 | 40 |
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41 //The following are reset in scan_stacks and synchronized by the safepoint |
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42 static bool _resweep; // Indicates that a change has happend and we want another sweep, |
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43 // always checked and reset at a safepoint so memory will be in sync. |
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44 static int _locked_seen; // Number of locked nmethods encountered during the scan |
0 | 45 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack |
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46 static jint _flush_token; // token that guards method flushing, making sure it is executed only once. |
0 | 47 |
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48 // These are set during a flush, a VM-operation |
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49 static long _last_flush_traversal_id; // trav number at last flush unloading |
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50 static jlong _last_full_flush_time; // timestamp of last emergency unloading |
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51 |
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52 // These are synchronized by the _sweep_started token |
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53 static int _highest_marked; // highest compile id dumped at last emergency unloading |
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54 static int _dead_compile_ids; // number of compile ids that where not in the cache last flush |
0 | 55 |
56 static void process_nmethod(nmethod *nm); | |
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57 static void release_nmethod(nmethod* nm); |
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58 |
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59 static void log_sweep(const char* msg, const char* format = NULL, ...); |
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60 static bool sweep_in_progress(); |
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61 |
0 | 62 public: |
63 static long traversal_count() { return _traversals; } | |
64 | |
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65 #ifdef ASSERT |
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66 // Keep track of sweeper activity in the ring buffer |
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67 static void record_sweep(nmethod* nm, int line); |
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68 static void report_events(int id, address entry); |
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69 static void report_events(); |
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70 #endif |
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71 |
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72 static void scan_stacks(); // Invoked at the end of each safepoint |
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73 static void sweep_code_cache(); // Concurrent part of sweep job |
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74 static void possibly_sweep(); // Compiler threads call this to sweep |
0 | 75 |
76 static void notify(nmethod* nm) { | |
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77 // Request a new sweep of the code cache from the beginning. No |
0 | 78 // need to synchronize the setting of this flag since it only |
79 // changes to false at safepoint so we can never overwrite it with false. | |
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80 _resweep = true; |
0 | 81 } |
1202 | 82 |
83 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate | |
84 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure | |
0 | 85 }; |
1972 | 86 |
87 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP |