jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp@2d127394260e

6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
Summary: Added new product ObjectAlignmentInBytes flag to control object alignment.
Reviewed-by: twisti, ysr, iveresov

     1 /*

     2  * Copyright 2002-2005 Sun Microsystems, Inc.  All Rights Reserved.

     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  */

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_cmsLockVerifier.cpp.incl"

    28 ///////////// Locking verification specific to CMS //////////////

    29 // Much like "assert_lock_strong()", except that it relaxes the

    30 // assertion somewhat for the parallel GC case, where VM thread

    31 // or the CMS thread might hold the lock on behalf of the parallel

    32 // threads. The second argument is in support of an extra locking

    33 // check for CFL spaces' free list locks.

    34 #ifndef PRODUCT

    35 void CMSLockVerifier::assert_locked(const Mutex* lock,

    36                                     const Mutex* p_lock1,

    37                                     const Mutex* p_lock2) {

    38   if (!Universe::is_fully_initialized()) {

    39     return;

    40   }

    42   Thread* myThread = Thread::current();

    44   if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token

    45     assert(p_lock1 == NULL && p_lock2 == NULL, "Unexpected caller error");

    46     if (myThread->is_ConcurrentGC_thread()) {

    47       // This test might have to change in the future, if there can be

    48       // multiple peer CMS threads.  But for now, if we're testing the CMS

    49       assert(myThread == ConcurrentMarkSweepThread::cmst(),

    50              "In CMS, CMS thread is the only Conc GC thread.");

    51       assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),

    52              "CMS thread should have CMS token");

    53     } else if (myThread->is_VM_thread()) {

    54       assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(),

    55              "VM thread should have CMS token");

    56     } else {

    57       // Token should be held on our behalf by one of the other

    58       // of CMS or VM thread; not enough easily testable

    59       // state info to test which here.

    60       assert(myThread->is_GC_task_thread(), "Unexpected thread type");

    61     }

    62     return;

    63   }

    65   if (myThread->is_VM_thread()

    66       || myThread->is_ConcurrentGC_thread()

    67       || myThread->is_Java_thread()) {

    68     // Make sure that we are holding the associated lock.

    69     assert_lock_strong(lock);

    70     // The checking of p_lock is a spl case for CFLS' free list

    71     // locks: we make sure that none of the parallel GC work gang

    72     // threads are holding "sub-locks" of freeListLock(). We check only

    73     // the parDictionaryAllocLock because the others are too numerous.

    74     // This spl case code is somewhat ugly and any improvements

    75     // are welcome.

    76     assert(p_lock1 == NULL || !p_lock1->is_locked() || p_lock1->owned_by_self(),

    77            "Possible race between this and parallel GC threads");

    78     assert(p_lock2 == NULL || !p_lock2->is_locked() || p_lock2->owned_by_self(),

    79            "Possible race between this and parallel GC threads");

    80   } else if (myThread->is_GC_task_thread()) {

    81     // Make sure that the VM or CMS thread holds lock on our behalf

    82     // XXX If there were a concept of a gang_master for a (set of)

    83     // gang_workers, we could have used the identity of that thread

    84     // for checking ownership here; for now we just disjunct.

    85     assert(lock->owner() == VMThread::vm_thread() ||

    86            lock->owner() == ConcurrentMarkSweepThread::cmst(),

    87            "Should be locked by VM thread or CMS thread on my behalf");

    88     if (p_lock1 != NULL) {

    89       assert_lock_strong(p_lock1);

    90     }

    91     if (p_lock2 != NULL) {

    92       assert_lock_strong(p_lock2);

    93     }

    94   } else {

    95     // Make sure we didn't miss some other thread type calling into here;

    96     // perhaps as a result of future VM evolution.

    97     ShouldNotReachHere();

    98   }

    99 }

   100 #endif

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp@2d127394260e

src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp