Thu, 12 Mar 2009 10:37:46 -0700
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2001-2003 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | #include "incls/_precompiled.incl" |
duke@435 | 26 | #include "incls/_threadCritical_solaris.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | // OS-includes here |
duke@435 | 29 | #include <thread.h> |
duke@435 | 30 | #include <synch.h> |
duke@435 | 31 | |
duke@435 | 32 | // |
duke@435 | 33 | // See threadCritical.hpp for details of this class. |
duke@435 | 34 | // |
duke@435 | 35 | // For some reason, we don't do locking until the |
duke@435 | 36 | // os::init() call completes. I'm not sure why this |
duke@435 | 37 | // is, and have left it that way for now. This should |
duke@435 | 38 | // be reviewed later. |
duke@435 | 39 | |
duke@435 | 40 | static mutex_t global_mut; |
duke@435 | 41 | static thread_t global_mut_owner = -1; |
duke@435 | 42 | static int global_mut_count = 0; |
duke@435 | 43 | static bool initialized = false; |
duke@435 | 44 | |
duke@435 | 45 | ThreadCritical::ThreadCritical() { |
duke@435 | 46 | if (initialized) { |
duke@435 | 47 | thread_t owner = thr_self(); |
duke@435 | 48 | if (global_mut_owner != owner) { |
duke@435 | 49 | if (os::Solaris::mutex_lock(&global_mut)) |
duke@435 | 50 | fatal1("ThreadCritical::ThreadCritical: mutex_lock failed (%s)", strerror(errno)); |
duke@435 | 51 | assert(global_mut_count == 0, "must have clean count"); |
duke@435 | 52 | assert(global_mut_owner == -1, "must have clean owner"); |
duke@435 | 53 | } |
duke@435 | 54 | global_mut_owner = owner; |
duke@435 | 55 | ++global_mut_count; |
duke@435 | 56 | } else { |
duke@435 | 57 | assert (Threads::number_of_threads() == 0, "valid only during initialization"); |
duke@435 | 58 | } |
duke@435 | 59 | } |
duke@435 | 60 | |
duke@435 | 61 | ThreadCritical::~ThreadCritical() { |
duke@435 | 62 | if (initialized) { |
duke@435 | 63 | assert(global_mut_owner == thr_self(), "must have correct owner"); |
duke@435 | 64 | assert(global_mut_count > 0, "must have correct count"); |
duke@435 | 65 | --global_mut_count; |
duke@435 | 66 | if (global_mut_count == 0) { |
duke@435 | 67 | global_mut_owner = -1; |
duke@435 | 68 | if (os::Solaris::mutex_unlock(&global_mut)) |
duke@435 | 69 | fatal1("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", strerror(errno)); |
duke@435 | 70 | } |
duke@435 | 71 | } else { |
duke@435 | 72 | assert (Threads::number_of_threads() == 0, "valid only during initialization"); |
duke@435 | 73 | } |
duke@435 | 74 | } |
duke@435 | 75 | |
duke@435 | 76 | void ThreadCritical::initialize() { |
duke@435 | 77 | // This method is called at the end of os::init(). Until |
duke@435 | 78 | // then, we don't do real locking. |
duke@435 | 79 | initialized = true; |
duke@435 | 80 | } |
duke@435 | 81 | |
duke@435 | 82 | void ThreadCritical::release() { |
duke@435 | 83 | } |