jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp@95f6641e38e0 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp@95f6641e38e0 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp

Fri, 10 Feb 2012 17:40:20 -0800

author: iveresov
date: Fri, 10 Feb 2012 17:40:20 -0800
changeset 3536: 95f6641e38e0
parent 2314: f95d63e2154a
child 3665: 8a729074feae
permissions: -rw-r--r--

7144296: PS: Optimize nmethods processing
Summary: Prunes scavenge roots in code list every young GC, promote objects directly pointed by the code immediately
Reviewed-by: johnc, jcoomes

 /*
  * Copyright (c) 2002, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP
 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
 inline PSPromotionManager* PSPromotionManager::manager_array(int index) {
   assert(_manager_array != NULL, "access of NULL manager_array");
   assert(index >= 0 && index <= (int)ParallelGCThreads, "out of range manager_array access");
   return _manager_array[index];
 }
 template <class T>
 inline void PSPromotionManager::claim_or_forward_internal_depth(T* p) {
   if (p != NULL) { // XXX: error if p != NULL here
     oop o = oopDesc::load_decode_heap_oop_not_null(p);
     if (o->is_forwarded()) {
       o = o->forwardee();
       // Card mark
       if (PSScavenge::is_obj_in_young((HeapWord*) o)) {
         PSScavenge::card_table()->inline_write_ref_field_gc(p, o);
       }
       oopDesc::encode_store_heap_oop_not_null(p, o);
     } else {
       push_depth(p);
     }
   }
 }
 template <class T>
 inline void PSPromotionManager::claim_or_forward_depth(T* p) {
   assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
   assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap,
          "Sanity");
   assert(Universe::heap()->is_in(p), "pointer outside heap");
   claim_or_forward_internal_depth(p);
 }
 //
 // This method is pretty bulky. It would be nice to split it up
 // into smaller submethods, but we need to be careful not to hurt
 // performance.
 //
 template<bool promote_immediately>
 oop PSPromotionManager::copy_to_survivor_space(oop o) {
   assert(PSScavenge::should_scavenge(&o), "Sanity");
   oop new_obj = NULL;
   // NOTE! We must be very careful with any methods that access the mark
   // in o. There may be multiple threads racing on it, and it may be forwarded
   // at any time. Do not use oop methods for accessing the mark!
   markOop test_mark = o->mark();
   // The same test as "o->is_forwarded()"
   if (!test_mark->is_marked()) {
     bool new_obj_is_tenured = false;
     size_t new_obj_size = o->size();
     if (!promote_immediately) {
       // Find the objects age, MT safe.
       int age = (test_mark->has_displaced_mark_helper() /* o->has_displaced_mark() */) ?
         test_mark->displaced_mark_helper()->age() : test_mark->age();
       // Try allocating obj in to-space (unless too old)
       if (age < PSScavenge::tenuring_threshold()) {
         new_obj = (oop) _young_lab.allocate(new_obj_size);
         if (new_obj == NULL && !_young_gen_is_full) {
           // Do we allocate directly, or flush and refill?
           if (new_obj_size > (YoungPLABSize / 2)) {
             // Allocate this object directly
             new_obj = (oop)young_space()->cas_allocate(new_obj_size);
           } else {
             // Flush and fill
             _young_lab.flush();
             HeapWord* lab_base = young_space()->cas_allocate(YoungPLABSize);
             if (lab_base != NULL) {
               _young_lab.initialize(MemRegion(lab_base, YoungPLABSize));
               // Try the young lab allocation again.
               new_obj = (oop) _young_lab.allocate(new_obj_size);
             } else {
               _young_gen_is_full = true;
             }
           }
         }
       }
     }
     // Otherwise try allocating obj tenured
     if (new_obj == NULL) {
 #ifndef PRODUCT
       if (Universe::heap()->promotion_should_fail()) {
         return oop_promotion_failed(o, test_mark);
       }
 #endif  // #ifndef PRODUCT
       new_obj = (oop) _old_lab.allocate(new_obj_size);
       new_obj_is_tenured = true;
       if (new_obj == NULL) {
         if (!_old_gen_is_full) {
           // Do we allocate directly, or flush and refill?
           if (new_obj_size > (OldPLABSize / 2)) {
             // Allocate this object directly
             new_obj = (oop)old_gen()->cas_allocate(new_obj_size);
           } else {
             // Flush and fill
             _old_lab.flush();
             HeapWord* lab_base = old_gen()->cas_allocate(OldPLABSize);
             if(lab_base != NULL) {
               _old_lab.initialize(MemRegion(lab_base, OldPLABSize));
               // Try the old lab allocation again.
               new_obj = (oop) _old_lab.allocate(new_obj_size);
             }
           }
         }
         // This is the promotion failed test, and code handling.
         // The code belongs here for two reasons. It is slightly
         // different thatn the code below, and cannot share the
         // CAS testing code. Keeping the code here also minimizes
         // the impact on the common case fast path code.
         if (new_obj == NULL) {
           _old_gen_is_full = true;
           return oop_promotion_failed(o, test_mark);
         }
       }
     }
     assert(new_obj != NULL, "allocation should have succeeded");
     // Copy obj
     Copy::aligned_disjoint_words((HeapWord*)o, (HeapWord*)new_obj, new_obj_size);
     // Now we have to CAS in the header.
     if (o->cas_forward_to(new_obj, test_mark)) {
       // We won any races, we "own" this object.
       assert(new_obj == o->forwardee(), "Sanity");
       // Increment age if obj still in new generation. Now that
       // we're dealing with a markOop that cannot change, it is
       // okay to use the non mt safe oop methods.
       if (!new_obj_is_tenured) {
         new_obj->incr_age();
         assert(young_space()->contains(new_obj), "Attempt to push non-promoted obj");
       }
       // Do the size comparison first with new_obj_size, which we
       // already have. Hopefully, only a few objects are larger than
       // _min_array_size_for_chunking, and most of them will be arrays.
       // So, the is->objArray() test would be very infrequent.
       if (new_obj_size > _min_array_size_for_chunking &&
           new_obj->is_objArray() &&
           PSChunkLargeArrays) {
         // we'll chunk it
         oop* const masked_o = mask_chunked_array_oop(o);
         push_depth(masked_o);
         TASKQUEUE_STATS_ONLY(++_arrays_chunked; ++_masked_pushes);
       } else {
         // we'll just push its contents
         new_obj->push_contents(this);
       }
     }  else {
       // We lost, someone else "owns" this object
       guarantee(o->is_forwarded(), "Object must be forwarded if the cas failed.");
       // Try to deallocate the space.  If it was directly allocated we cannot
       // deallocate it, so we have to test.  If the deallocation fails,
       // overwrite with a filler object.
       if (new_obj_is_tenured) {
         if (!_old_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) {
           CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size);
         }
       } else if (!_young_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) {
         CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size);
       }
       // don't update this before the unallocation!
       new_obj = o->forwardee();
     }
   } else {
     assert(o->is_forwarded(), "Sanity");
     new_obj = o->forwardee();
   }
 #ifdef DEBUG
   // This code must come after the CAS test, or it will print incorrect
   // information.
   if (TraceScavenge) {
     gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (" SIZE_FORMAT ")}",
        PSScavenge::should_scavenge(&new_obj) ? "copying" : "tenuring",
        new_obj->blueprint()->internal_name(), o, new_obj, new_obj->size());
   }
 #endif
   return new_obj;
 }
 inline void PSPromotionManager::process_popped_location_depth(StarTask p) {
   if (is_oop_masked(p)) {
     assert(PSChunkLargeArrays, "invariant");
     oop const old = unmask_chunked_array_oop(p);
     process_array_chunk(old);
   } else {
     if (p.is_narrow()) {
       assert(UseCompressedOops, "Error");
       PSScavenge::copy_and_push_safe_barrier<narrowOop, /*promote_immediately=*/false>(this, p);
     } else {
       PSScavenge::copy_and_push_safe_barrier<oop, /*promote_immediately=*/false>(this, p);
     }
   }
 }
 #if TASKQUEUE_STATS
 void PSPromotionManager::record_steal(StarTask& p) {
   if (is_oop_masked(p)) {
     ++_masked_steals;
   }
 }
 #endif // TASKQUEUE_STATS
 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp@95f6641e38e0 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp