jdk8-mips64-public/hotspot: src/share/vm/memory/barrierSet.inline.hpp@0bfd3fb24150

6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory
Reviewed-by: ysr, jcoomes

     1 /*

     2  * Copyright 2001-2008 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 functions of BarrierSet, which de-virtualize certain

    26 // performance-critical calls when the barrier is the most common

    27 // card-table kind.

    29 template <class T> void BarrierSet::write_ref_field_pre(T* field, oop new_val) {

    30   if (kind() == CardTableModRef) {

    31     ((CardTableModRefBS*)this)->inline_write_ref_field_pre(field, new_val);

    32   } else {

    33     write_ref_field_pre_work(field, new_val);

    34   }

    35 }

    37 void BarrierSet::write_ref_field(void* field, oop new_val) {

    38   if (kind() == CardTableModRef) {

    39     ((CardTableModRefBS*)this)->inline_write_ref_field(field, new_val);

    40   } else {

    41     write_ref_field_work(field, new_val);

    42   }

    43 }

    45 // count is number of array elements being written

    46 void BarrierSet::write_ref_array(HeapWord* start, size_t count) {

    47   assert(count <= (size_t)max_intx, "count too large");

    48   HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize));

    49   // In the case of compressed oops, start and end may potentially be misaligned;

    50   // so we need to conservatively align the first downward (this is not

    51   // strictly necessary for current uses, but a case of good hygiene and,

    52   // if you will, aesthetics) and the second upward (this is essential for

    53   // current uses) to a HeapWord boundary, so we mark all cards overlapping

    54   // this write. If this evolves in the future to calling a

    55   // logging barrier of narrow oop granularity, like the pre-barrier for G1

    56   // (mentioned here merely by way of example), we will need to change this

    57   // interface, so it is "exactly precise" (if i may be allowed the adverbial

    58   // redundancy for emphasis) and does not include narrow oop slots not

    59   // included in the original write interval.

    60   HeapWord* aligned_start = (HeapWord*)align_size_down((uintptr_t)start, HeapWordSize);

    61   HeapWord* aligned_end   = (HeapWord*)align_size_up  ((uintptr_t)end,   HeapWordSize);

    62   // If compressed oops were not being used, these should already be aligned

    63   assert(UseCompressedOops || (aligned_start == start && aligned_end == end),

    64          "Expected heap word alignment of start and end");

    65 #if 0

    66   warning("Post:\t" INTPTR_FORMAT "[" SIZE_FORMAT "] : [" INTPTR_FORMAT","INTPTR_FORMAT")\t",

    67                    start,            count,              aligned_start,   aligned_end);

    68 #endif

    69   write_ref_array_work(MemRegion(aligned_start, aligned_end));

    70 }

    73 void BarrierSet::write_region(MemRegion mr) {

    74   if (kind() == CardTableModRef) {

    75     ((CardTableModRefBS*)this)->inline_write_region(mr);

    76   } else {

    77     write_region_work(mr);

    78   }

    79 }

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

src/share/vm/memory/barrierSet.inline.hpp@0bfd3fb24150

src/share/vm/memory/barrierSet.inline.hpp