jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RootProcessor.hpp@38d6febe66af

8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
Summary: Create a G1RootProcessor and move SharedHeap root processing to GenCollectedHeap
Reviewed-by: brutisso, tschatzl, ehelin

     1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP

    28 #include "memory/allocation.hpp"

    29 #include "memory/sharedHeap.hpp"

    30 #include "runtime/mutex.hpp"

    32 class CLDClosure;

    33 class CodeBlobClosure;

    34 class G1CollectedHeap;

    35 class G1ParPushHeapRSClosure;

    36 class Monitor;

    37 class OopClosure;

    38 class SubTasksDone;

    40 // Scoped object to assist in applying oop, CLD and code blob closures to

    41 // root locations. Handles claiming of different root scanning tasks

    42 // and takes care of global state for root scanning via a StrongRootsScope.

    43 // In the parallel case there is a shared G1RootProcessor object where all

    44 // worker thread call the process_roots methods.

    45 class G1RootProcessor : public StackObj {

    46   G1CollectedHeap* _g1h;

    47   SubTasksDone* _process_strong_tasks;

    48   SharedHeap::StrongRootsScope _srs;

    50   // Used to implement the Thread work barrier.

    51   Monitor _lock;

    52   volatile jint _n_workers_discovered_strong_classes;

    54   enum G1H_process_roots_tasks {

    55     G1RP_PS_Universe_oops_do,

    56     G1RP_PS_JNIHandles_oops_do,

    57     G1RP_PS_ObjectSynchronizer_oops_do,

    58     G1RP_PS_FlatProfiler_oops_do,

    59     G1RP_PS_Management_oops_do,

    60     G1RP_PS_SystemDictionary_oops_do,

    61     G1RP_PS_ClassLoaderDataGraph_oops_do,

    62     G1RP_PS_jvmti_oops_do,

    63     G1RP_PS_CodeCache_oops_do,

    64     G1RP_PS_filter_satb_buffers,

    65     G1RP_PS_refProcessor_oops_do,

    66     // Leave this one last.

    67     G1RP_PS_NumElements

    68   };

    70   void worker_has_discovered_all_strong_classes();

    71   void wait_until_all_strong_classes_discovered();

    73   void process_java_roots(OopClosure* scan_non_heap_roots,

    74                           CLDClosure* thread_stack_clds,

    75                           CLDClosure* scan_strong_clds,

    76                           CLDClosure* scan_weak_clds,

    77                           CodeBlobClosure* scan_strong_code);

    79   void process_vm_roots(OopClosure* scan_non_heap_roots,

    80                         OopClosure* scan_non_heap_weak_roots);

    82 public:

    83   G1RootProcessor(G1CollectedHeap* g1h);

    85   // Apply closures to the strongly and weakly reachable roots in the system

    86   // in a single pass.

    87   // Record and report timing measurements for sub phases using the worker_i

    88   void evacuate_roots(OopClosure* scan_non_heap_roots,

    89                       OopClosure* scan_non_heap_weak_roots,

    90                       CLDClosure* scan_strong_clds,

    91                       CLDClosure* scan_weak_clds,

    92                       bool trace_metadata,

    93                       uint worker_i);

    95   // Apply oops, clds and blobs to all strongly reachable roots in the system

    96   void process_strong_roots(OopClosure* oops,

    97                             CLDClosure* clds,

    98                             CodeBlobClosure* blobs);

   100   // Apply oops, clds and blobs to strongly and weakly reachable roots in the system

   101   void process_all_roots(OopClosure* oops,

   102                          CLDClosure* clds,

   103                          CodeBlobClosure* blobs);

   105   // Apply scan_rs to all locations in the union of the remembered sets for all

   106   // regions in the collection set

   107   // (having done "set_region" to indicate the region in which the root resides),

   108   void scan_remembered_sets(G1ParPushHeapRSClosure* scan_rs,

   109                             OopClosure* scan_non_heap_weak_roots,

   110                             uint worker_i);

   112   // Inform the root processor about the number of worker threads

   113   void set_num_workers(int active_workers);

   114 };

   116 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP

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

src/share/vm/gc_implementation/g1/g1RootProcessor.hpp@38d6febe66af

src/share/vm/gc_implementation/g1/g1RootProcessor.hpp