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annotate src/os/posix/vm/os_posix.hpp @ 20338:8d5f66b42c53

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8055525: Bigapp weblogic+medrec fails to startup after JDK-8038423 Summary: If large pages are enabled and configured in Linux, the VM always pre-commits the entire space. The VM fails verification of the commit of the initial heap because some internal data structure marked all memory pages of the heap as committed during initialization. This makes the code think that we attempted a double-commit during first allocation of the heap. Remove the initial marking of memory pages of the heap to committed. Reviewed-by: mgerdin
author tschatzl
date Wed, 20 Aug 2014 14:34:40 +0200
parents a9becfeecd1b
children 4ca6dc0799b6
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1 /*
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef OS_POSIX_VM_OS_POSIX_HPP
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26 #define OS_POSIX_VM_OS_POSIX_HPP
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27 class Posix {
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28 friend class os;
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29
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30 protected:
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31 static void print_distro_info(outputStream* st);
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32 static void print_rlimit_info(outputStream* st);
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33 static void print_uname_info(outputStream* st);
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34 static void print_libversion_info(outputStream* st);
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35 static void print_load_average(outputStream* st);
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36
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37 public:
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38
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39 // Returns true if signal is valid.
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40 static bool is_valid_signal(int sig);
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41
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42 // Helper function, returns a string (e.g. "SIGILL") for a signal.
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43 // Returned string is a constant. For unknown signals "UNKNOWN" is returned.
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44 static const char* get_signal_name(int sig, char* out, size_t outlen);
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45
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46 // Returns one-line short description of a signal set in a user provided buffer.
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47 static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size);
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48
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49 // Prints a short one-line description of a signal set.
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50 static void print_signal_set_short(outputStream* st, const sigset_t* set);
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51
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52 // Writes a one-line description of a combination of sigaction.sa_flags
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53 // into a user provided buffer. Returns that buffer.
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54 static const char* describe_sa_flags(int flags, char* buffer, size_t size);
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55
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56 // Prints a one-line description of a combination of sigaction.sa_flags.
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57 static void print_sa_flags(outputStream* st, int flags);
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58
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59 // A POSIX conform, platform-independend siginfo print routine.
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60 static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
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61
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62 };
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63
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64 /*
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65 * Crash protection for the watcher thread. Wrap the callback
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66 * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
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67 * back.
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68 * To be able to use this - don't take locks, don't rely on destructors,
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69 * don't make OS library calls, don't allocate memory, don't print,
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70 * don't call code that could leave the heap / memory in an inconsistent state,
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71 * or anything else where we are not in control if we suddenly jump out.
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72 */
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73 class WatcherThreadCrashProtection : public StackObj {
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74 public:
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75 WatcherThreadCrashProtection();
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76 bool call(os::CrashProtectionCallback& cb);
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77
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78 static void check_crash_protection(int signal, Thread* thread);
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79 private:
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80 void restore();
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81 sigjmp_buf _jmpbuf;
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82 };
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83
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84 #endif // OS_POSIX_VM_OS_POSIX_HPP