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view src/os_cpu/windows_x86/vm/os_windows_x86.hpp @ 1886:72a161e62cc4
6991377: G1: race between concurrent refinement and humongous object allocation
Summary: There is a race between the concurrent refinement threads and the humongous object allocation that can cause the concurrent refinement threads to corrupt the part of the BOT that it is being initialized by the humongous object allocation operation. The solution is to do the humongous object allocation in careful steps to ensure that the concurrent refinement threads always have a consistent view over the BOT, region contents, and top. The fix includes some very minor tidying up in sparsePRT.
Reviewed-by: jcoomes, johnc, ysr
| author | tonyp |
|---|---|
| date | Sat, 16 Oct 2010 17:12:19 -0400 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
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/* * Copyright (c) 1999, 2009, 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. * */ // // NOTE: we are back in class os here, not win32 // #ifdef AMD64 static jint (*atomic_xchg_func) (jint, volatile jint*); static intptr_t (*atomic_xchg_ptr_func) (intptr_t, volatile intptr_t*); static jint (*atomic_cmpxchg_func) (jint, volatile jint*, jint); static jlong (*atomic_cmpxchg_long_func) (jlong, volatile jlong*, jlong); static jint (*atomic_add_func) (jint, volatile jint*); static intptr_t (*atomic_add_ptr_func) (intptr_t, volatile intptr_t*); static jint atomic_xchg_bootstrap (jint, volatile jint*); static intptr_t atomic_xchg_ptr_bootstrap (intptr_t, volatile intptr_t*); static jint atomic_cmpxchg_bootstrap (jint, volatile jint*, jint); #else static jlong (*atomic_cmpxchg_long_func) (jlong, volatile jlong*, jlong); #endif // AMD64 static jlong atomic_cmpxchg_long_bootstrap(jlong, volatile jlong*, jlong); #ifdef AMD64 static jint atomic_add_bootstrap (jint, volatile jint*); static intptr_t atomic_add_ptr_bootstrap (intptr_t, volatile intptr_t*); #endif // AMD64 static void setup_fpu(); static bool supports_sse() { return true; } static bool register_code_area(char *low, char *high);