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annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp @ 1145:e018e6884bd8

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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 a61af66fc99e
children c18cbe5936b8
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1 /*
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2 * Copyright 2002-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_cmsLockVerifier.cpp.incl"
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27
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28 ///////////// Locking verification specific to CMS //////////////
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29 // Much like "assert_lock_strong()", except that it relaxes the
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30 // assertion somewhat for the parallel GC case, where VM thread
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31 // or the CMS thread might hold the lock on behalf of the parallel
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32 // threads. The second argument is in support of an extra locking
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33 // check for CFL spaces' free list locks.
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34 #ifndef PRODUCT
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35 void CMSLockVerifier::assert_locked(const Mutex* lock,
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36 const Mutex* p_lock1,
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37 const Mutex* p_lock2) {
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38 if (!Universe::is_fully_initialized()) {
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39 return;
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40 }
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41
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42 Thread* myThread = Thread::current();
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43
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44 if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token
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45 assert(p_lock1 == NULL && p_lock2 == NULL, "Unexpected caller error");
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46 if (myThread->is_ConcurrentGC_thread()) {
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47 // This test might have to change in the future, if there can be
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48 // multiple peer CMS threads. But for now, if we're testing the CMS
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49 assert(myThread == ConcurrentMarkSweepThread::cmst(),
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50 "In CMS, CMS thread is the only Conc GC thread.");
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51 assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
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52 "CMS thread should have CMS token");
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53 } else if (myThread->is_VM_thread()) {
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54 assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(),
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55 "VM thread should have CMS token");
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56 } else {
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57 // Token should be held on our behalf by one of the other
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58 // of CMS or VM thread; not enough easily testable
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59 // state info to test which here.
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60 assert(myThread->is_GC_task_thread(), "Unexpected thread type");
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61 }
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62 return;
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63 }
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64
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65 if (myThread->is_VM_thread()
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66 || myThread->is_ConcurrentGC_thread()
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67 || myThread->is_Java_thread()) {
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68 // Make sure that we are holding the associated lock.
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69 assert_lock_strong(lock);
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70 // The checking of p_lock is a spl case for CFLS' free list
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71 // locks: we make sure that none of the parallel GC work gang
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72 // threads are holding "sub-locks" of freeListLock(). We check only
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73 // the parDictionaryAllocLock because the others are too numerous.
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74 // This spl case code is somewhat ugly and any improvements
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75 // are welcome.
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76 assert(p_lock1 == NULL || !p_lock1->is_locked() || p_lock1->owned_by_self(),
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77 "Possible race between this and parallel GC threads");
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78 assert(p_lock2 == NULL || !p_lock2->is_locked() || p_lock2->owned_by_self(),
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79 "Possible race between this and parallel GC threads");
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80 } else if (myThread->is_GC_task_thread()) {
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81 // Make sure that the VM or CMS thread holds lock on our behalf
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82 // XXX If there were a concept of a gang_master for a (set of)
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83 // gang_workers, we could have used the identity of that thread
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84 // for checking ownership here; for now we just disjunct.
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85 assert(lock->owner() == VMThread::vm_thread() ||
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86 lock->owner() == ConcurrentMarkSweepThread::cmst(),
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87 "Should be locked by VM thread or CMS thread on my behalf");
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88 if (p_lock1 != NULL) {
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89 assert_lock_strong(p_lock1);
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90 }
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91 if (p_lock2 != NULL) {
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92 assert_lock_strong(p_lock2);
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93 }
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94 } else {
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95 // Make sure we didn't miss some other thread type calling into here;
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96 // perhaps as a result of future VM evolution.
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97 ShouldNotReachHere();
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98 }
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99 }
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100 #endif