Mercurial > hg > graal-jvmci-8
annotate src/os/linux/vm/vmError_linux.cpp @ 12832:263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
Summary: Don't turn on transparent huge pages (-XX:+UseTransparentHugePages) unless explicitly specified on the command line. This has the effect that large pages are never turned on Linux unless the user has explicitly enabled any of the large pages flags: -XX:+UseLargePages, -XX:+UseTransparentHugePages, -XX:+UseHugeTLBFS, and -XX:+UseSHM.
Reviewed-by: jwilhelm, tschatzl, brutisso
| author | stefank |
|---|---|
| date | Sat, 05 Oct 2013 10:14:58 +0200 |
| parents | c3e799c37717 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "runtime/arguments.hpp" | |
| 27 #include "runtime/os.hpp" | |
| 28 #include "runtime/thread.hpp" | |
| 29 #include "utilities/vmError.hpp" | |
| 0 | 30 |
| 31 #include <sys/types.h> | |
| 32 #include <sys/wait.h> | |
| 33 #include <sys/syscall.h> | |
| 34 #include <unistd.h> | |
| 35 #include <signal.h> | |
| 36 | |
| 37 void VMError::show_message_box(char *buf, int buflen) { | |
| 38 bool yes; | |
| 39 do { | |
| 40 error_string(buf, buflen); | |
| 41 int len = (int)strlen(buf); | |
| 42 char *p = &buf[len]; | |
| 43 | |
| 44 jio_snprintf(p, buflen - len, | |
| 45 "\n\n" | |
| 46 "Do you want to debug the problem?\n\n" | |
| 6843 | 47 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " UINTX_FORMAT " (" INTPTR_FORMAT ")\n" |
| 0 | 48 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" |
| 49 "Otherwise, press RETURN to abort...", | |
| 50 os::current_process_id(), os::current_process_id(), | |
| 2008 | 51 os::current_thread_id(), os::current_thread_id()); |
| 0 | 52 |
| 53 yes = os::message_box("Unexpected Error", buf); | |
| 54 | |
| 55 if (yes) { | |
| 56 // yes, user asked VM to launch debugger | |
| 57 jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d", | |
| 58 os::current_process_id(), os::current_process_id()); | |
| 59 | |
| 60 os::fork_and_exec(buf); | |
| 61 yes = false; | |
| 62 } | |
| 63 } while (yes); | |
| 64 } | |
| 65 | |
| 66 // Space for our "saved" signal flags and handlers | |
| 67 static int resettedSigflags[2]; | |
| 68 static address resettedSighandler[2]; | |
| 69 | |
| 70 static void save_signal(int idx, int sig) | |
| 71 { | |
| 72 struct sigaction sa; | |
| 73 sigaction(sig, NULL, &sa); | |
| 74 resettedSigflags[idx] = sa.sa_flags; | |
| 75 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) | |
| 76 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 77 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 78 } | |
| 79 | |
| 80 int VMError::get_resetted_sigflags(int sig) { | |
| 81 if(SIGSEGV == sig) { | |
| 82 return resettedSigflags[0]; | |
| 83 } else if(SIGBUS == sig) { | |
| 84 return resettedSigflags[1]; | |
| 85 } | |
| 86 return -1; | |
| 87 } | |
| 88 | |
| 89 address VMError::get_resetted_sighandler(int sig) { | |
| 90 if(SIGSEGV == sig) { | |
| 91 return resettedSighandler[0]; | |
| 92 } else if(SIGBUS == sig) { | |
| 93 return resettedSighandler[1]; | |
| 94 } | |
| 95 return NULL; | |
| 96 } | |
| 97 | |
| 98 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { | |
| 99 // unmask current signal | |
| 100 sigset_t newset; | |
| 101 sigemptyset(&newset); | |
| 102 sigaddset(&newset, sig); | |
| 103 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
| 104 | |
| 105 VMError err(NULL, sig, NULL, info, ucVoid); | |
| 106 err.report_and_die(); | |
| 107 } | |
| 108 | |
| 109 void VMError::reset_signal_handlers() { | |
| 110 // Save sigflags for resetted signals | |
| 111 save_signal(0, SIGSEGV); | |
| 112 save_signal(1, SIGBUS); | |
| 113 os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler)); | |
| 114 os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler)); | |
| 115 } |