jdk8-mips64-public/hotspot: src/share/vm/memory/threadLocalAllocBuffer.inline.hpp@2dd52dea6d28

6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
Summary: Remove invalid assert and mangle filler objects in TLABs that are being retired.
Reviewed-by: ysr, jmasa

     1 /*

     2  * Copyright 1999-2009 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 HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {

    26   invariants();

    27   HeapWord* obj = top();

    28   if (pointer_delta(end(), obj) >= size) {

    29     // successful thread-local allocation

    30 #ifdef ASSERT

    31     // Skip mangling the space corresponding to the object header to

    32     // ensure that the returned space is not considered parsable by

    33     // any concurrent GC thread.

    34     size_t hdr_size = CollectedHeap::min_fill_size();

    35     Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal);

    36 #endif // ASSERT

    37     // This addition is safe because we know that top is

    38     // at least size below end, so the add can't wrap.

    39     set_top(obj + size);

    41     invariants();

    42     return obj;

    43   }

    44   return NULL;

    45 }

    47 inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {

    48   const size_t aligned_obj_size = align_object_size(obj_size);

    50   // Compute the size for the new TLAB.

    51   // The "last" tlab may be smaller to reduce fragmentation.

    52   // unsafe_max_tlab_alloc is just a hint.

    53   const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) /

    54                                                   HeapWordSize;

    55   size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size);

    57   // Make sure there's enough room for object and filler int[].

    58   const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve();

    59   if (new_tlab_size < obj_plus_filler_size) {

    60     // If there isn't enough room for the allocation, return failure.

    61     if (PrintTLAB && Verbose) {

    62       gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"

    63                     " returns failure",

    64                     obj_size);

    65     }

    66     return 0;

    67   }

    68   if (PrintTLAB && Verbose) {

    69     gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"

    70                   " returns " SIZE_FORMAT,

    71                   obj_size, new_tlab_size);

    72   }

    73   return new_tlab_size;

    74 }

    77 void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) {

    78   // Raise size required to bypass TLAB next time. Why? Else there's

    79   // a risk that a thread that repeatedly allocates objects of one

    80   // size will get stuck on this slow path.

    82   set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment());

    84   _slow_allocations++;

    86   if (PrintTLAB && Verbose) {

    87     Thread* thrd = myThread();

    88     gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]"

    89                         " obj: "SIZE_FORMAT

    90                         " free: "SIZE_FORMAT

    91                         " waste: "SIZE_FORMAT"\n",

    92                         "slow", thrd, thrd->osthread()->thread_id(),

    93                         obj_size, free(), refill_waste_limit());

    94   }

    95 }

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

src/share/vm/memory/threadLocalAllocBuffer.inline.hpp@2dd52dea6d28

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