jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp@87fa6e083d82

6760309: G1: update remembered sets during Full GCs
Reviewed-by: iveresov, tonyp

     1 /*

     2  * Copyright 2001-2007 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 inline size_t G1RemSet::n_workers() {

    26   if (_g1->workers() != NULL) {

    27     return _g1->workers()->total_workers();

    28   } else {

    29     return 1;

    30   }

    31 }

    33 inline void HRInto_G1RemSet::write_ref_nv(HeapRegion* from, oop* p) {

    34   par_write_ref(from, p, 0);

    35 }

    37 inline void HRInto_G1RemSet::write_ref(HeapRegion* from, oop* p) {

    38   write_ref_nv(from, p);

    39 }

    41 inline bool HRInto_G1RemSet::self_forwarded(oop obj) {

    42   bool result =  (obj->is_forwarded() && (obj->forwardee()== obj));

    43   return result;

    44 }

    46 inline void HRInto_G1RemSet::par_write_ref(HeapRegion* from, oop* p, int tid) {

    47   oop obj = *p;

    48 #ifdef ASSERT

    49   // can't do because of races

    50   // assert(obj == NULL || obj->is_oop(), "expected an oop");

    52   // Do the safe subset of is_oop

    53   if (obj != NULL) {

    54 #ifdef CHECK_UNHANDLED_OOPS

    55     oopDesc* o = obj.obj();

    56 #else

    57     oopDesc* o = obj;

    58 #endif // CHECK_UNHANDLED_OOPS

    59     assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");

    60     assert(Universe::heap()->is_in_reserved(obj), "must be in heap");

    61   }

    62 #endif // ASSERT

    63   assert(from == NULL || from->is_in_reserved(p),

    64          "p is not in from");

    65   HeapRegion* to = _g1->heap_region_containing(obj);

    66   // The test below could be optimized by applying a bit op to to and from.

    67   if (to != NULL && from != NULL && from != to) {

    68     bool update_delayed = false;

    69     // There is a tricky infinite loop if we keep pushing

    70     // self forwarding pointers onto our _new_refs list.

    71     // The _par_traversal_in_progress flag is true during the collection pause,

    72     // false during the evacuation failure handing.

    73     if (_par_traversal_in_progress &&

    74         to->in_collection_set() && !self_forwarded(obj)) {

    75       _new_refs[tid]->push(p);

    76       // Deferred updates to the Cset are either discarded (in the normal case),

    77       // or processed (if an evacuation failure occurs) at the end

    78       // of the collection.

    79       // See HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do().

    80       update_delayed = true;

    81     }

    83     if (!to->popular() && !update_delayed) {

    84 #if G1_REM_SET_LOGGING

    85       gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS"

    86                              " for region [" PTR_FORMAT ", " PTR_FORMAT ")",

    87                              p, obj,

    88                              to->bottom(), to->end());

    89 #endif

    90       assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");

    91       if (to->rem_set()->add_reference(p, tid)) {

    92         _g1->schedule_popular_region_evac(to);

    93       }

    94     }

    95   }

    96 }

    98 inline void UpdateRSOopClosure::do_oop(narrowOop* p) {

    99   guarantee(false, "NYI");

   100 }

   102 inline void UpdateRSOopClosure::do_oop(oop* p) {

   103   assert(_from != NULL, "from region must be non-NULL");

   104   _rs->par_write_ref(_from, p, _worker_i);

   105 }

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