jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp@15c5903cf9e1

6865703: G1: Parallelize hot card cache cleanup
Summary: Have the GC worker threads clear the hot card cache in parallel by having each worker thread claim a chunk of the card cache and process the cards in that chunk. The size of the chunks that each thread will claim is determined at VM initialization from the size of the card cache and the number of worker threads.
Reviewed-by: jmasa, tonyp

     1 /*

     2  * Copyright 2001-2009 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 template <class T> inline void HRInto_G1RemSet::write_ref_nv(HeapRegion* from, T* p) {

    34   par_write_ref_nv(from, p, 0);

    35 }

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

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

    39   return result;

    40 }

    42 template <class T> inline void HRInto_G1RemSet::par_write_ref_nv(HeapRegion* from, T* p, int tid) {

    43   oop obj = oopDesc::load_decode_heap_oop(p);

    44 #ifdef ASSERT

    45   // can't do because of races

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

    48   // Do the safe subset of is_oop

    49   if (obj != NULL) {

    50 #ifdef CHECK_UNHANDLED_OOPS

    51     oopDesc* o = obj.obj();

    52 #else

    53     oopDesc* o = obj;

    54 #endif // CHECK_UNHANDLED_OOPS

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

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

    57   }

    58 #endif // ASSERT

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

    60          "p is not in from");

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

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

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

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

    65     // self forwarding pointers onto our _new_refs list.

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

    67     // false during the evacuation failure handing.

    68     if (_par_traversal_in_progress &&

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

    70       _new_refs[tid]->push((void*)p);

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

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

    73       // of the collection.

    74       // See HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do().

    75     } else {

    76 #if G1_REM_SET_LOGGING

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

    78                              " for region [" PTR_FORMAT ", " PTR_FORMAT ")",

    79                              p, obj,

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

    81 #endif

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

    83       to->rem_set()->add_reference(p, tid);

    84     }

    85   }

    86 }

    88 template <class T> inline void UpdateRSOopClosure::do_oop_work(T* p) {

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

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

    91 }

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

src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp@15c5903cf9e1

src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp