jdk8-mips64-public/hotspot: src/share/vm/memory/gcLocker.inline.hpp@4c84d351cca9

8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso

     1 /*

     2  * Copyright (c) 2000, 2012, 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_MEMORY_GCLOCKER_INLINE_HPP

    26 #define SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP

    28 #include "memory/gcLocker.hpp"

    30 inline void GC_locker::lock() {

    31   // cast away volatile

    32   Atomic::inc(&_lock_count);

    33   CHECK_UNHANDLED_OOPS_ONLY(

    34     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })

    35   assert(Universe::heap() == NULL ||

    36          !Universe::heap()->is_gc_active(), "locking failed");

    37 }

    39 inline void GC_locker::unlock() {

    40   // cast away volatile

    41   Atomic::dec(&_lock_count);

    42   CHECK_UNHANDLED_OOPS_ONLY(

    43     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })

    44 }

    46 inline void GC_locker::lock_critical(JavaThread* thread) {

    47   if (!thread->in_critical()) {

    48     if (needs_gc()) {

    49       // jni_lock call calls enter_critical under the lock so that the

    50       // global lock count and per thread count are in agreement.

    51       jni_lock(thread);

    52       return;

    53     }

    54     increment_debug_jni_lock_count();

    55   }

    56   thread->enter_critical();

    57 }

    59 inline void GC_locker::unlock_critical(JavaThread* thread) {

    60   if (thread->in_last_critical()) {

    61     if (needs_gc()) {

    62       // jni_unlock call calls exit_critical under the lock so that

    63       // the global lock count and per thread count are in agreement.

    64       jni_unlock(thread);

    65       return;

    66     }

    67     decrement_debug_jni_lock_count();

    68   }

    69   thread->exit_critical();

    70 }

    72 #endif // SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP

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

src/share/vm/memory/gcLocker.inline.hpp@4c84d351cca9

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