view src/share/vm/gc_implementation/g1/vm_operations_g1.cpp @ 1088:3fc996d4edd2

6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection Summary: ScavengeALot now causes an incremental (but possibly partially young, in the G1 sense) collection. Some such collections may be abandoned on account of MMU specs. Band-aided a native leak associated with abandoned pauses, as well as an MMU tracker overflow related to frequent scavenge events in the face of a large MMU denominator interval; the latter is protected by a product flag that defaults to false. Reviewed-by: tonyp
author ysr
date Thu, 19 Nov 2009 13:43:25 -0800
parents bd02caa94611
children
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/*
 * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

#include "incls/_precompiled.incl"
#include "incls/_vm_operations_g1.cpp.incl"

void VM_G1CollectForAllocation::doit() {
  JvmtiGCForAllocationMarker jgcm;
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
  _res = g1h->satisfy_failed_allocation(_size);
  assert(g1h->is_in_or_null(_res), "result not in heap");
}

void VM_G1CollectFull::doit() {
  JvmtiGCFullMarker jgcm;
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
  GCCauseSetter x(g1h, _gc_cause);
  g1h->do_full_collection(false /* clear_all_soft_refs */);
}

void VM_G1IncCollectionPause::doit() {
  JvmtiGCForAllocationMarker jgcm;
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
  GCCauseSetter x(g1h, _gc_cause);
  g1h->do_collection_pause_at_safepoint();
}

void VM_CGC_Operation::doit() {
  gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
  TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
  TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty);
  SharedHeap* sh = SharedHeap::heap();
  // This could go away if CollectedHeap gave access to _gc_is_active...
  if (sh != NULL) {
    IsGCActiveMark x;
    _cl->do_void();
  } else {
    _cl->do_void();
  }
}

bool VM_CGC_Operation::doit_prologue() {
  Heap_lock->lock();
  SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
  return true;
}

void VM_CGC_Operation::doit_epilogue() {
  SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
  Heap_lock->unlock();
}