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comparison src/os/linux/vm/os_linux.cpp @ 2204:63d374c54045

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7014918: Improve core/minidump handling in Hotspot Summary: Added Minidump support on Windows, enabled large page core dumps when coredump_filter is present and writing out path/rlimit for core dumps. Reviewed-by: poonam, dsamersoff, sla, coleenp
author ctornqvi
date Wed, 09 Feb 2011 11:08:10 +0100
parents 9cd8a2c2d584
children 0cd39a385a72 da091bb67459
comparison
equal deleted inserted replaced
2203:5197f3d713a1 2204:63d374c54045
1 /* 1 /*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
129 129
130 // for timer info max values which include all bits 130 // for timer info max values which include all bits
131 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 131 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
132 #define SEC_IN_NANOSECS 1000000000LL 132 #define SEC_IN_NANOSECS 1000000000LL
133 133
134 #define LARGEPAGES_BIT (1 << 6)
134 //////////////////////////////////////////////////////////////////////////////// 135 ////////////////////////////////////////////////////////////////////////////////
135 // global variables 136 // global variables
136 julong os::Linux::_physical_memory = 0; 137 julong os::Linux::_physical_memory = 0;
137 138
138 address os::Linux::_initial_thread_stack_bottom = NULL; 139 address os::Linux::_initial_thread_stack_bottom = NULL;
2815 2816
2816 bool os::unguard_memory(char* addr, size_t size) { 2817 bool os::unguard_memory(char* addr, size_t size) {
2817 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); 2818 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE);
2818 } 2819 }
2819 2820
2821 /*
2822 * Set the coredump_filter bits to include largepages in core dump (bit 6)
2823 *
2824 * From the coredump_filter documentation:
2825 *
2826 * - (bit 0) anonymous private memory
2827 * - (bit 1) anonymous shared memory
2828 * - (bit 2) file-backed private memory
2829 * - (bit 3) file-backed shared memory
2830 * - (bit 4) ELF header pages in file-backed private memory areas (it is
2831 * effective only if the bit 2 is cleared)
2832 * - (bit 5) hugetlb private memory
2833 * - (bit 6) hugetlb shared memory
2834 */
2835 static void set_coredump_filter(void) {
2836 FILE *f;
2837 long cdm;
2838
2839 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
2840 return;
2841 }
2842
2843 if (fscanf(f, "%lx", &cdm) != 1) {
2844 fclose(f);
2845 return;
2846 }
2847
2848 rewind(f);
2849
2850 if ((cdm & LARGEPAGES_BIT) == 0) {
2851 cdm |= LARGEPAGES_BIT;
2852 fprintf(f, "%#lx", cdm);
2853 }
2854
2855 fclose(f);
2856 }
2857
2820 // Large page support 2858 // Large page support
2821 2859
2822 static size_t _large_page_size = 0; 2860 static size_t _large_page_size = 0;
2823 2861
2824 bool os::large_page_init() { 2862 bool os::large_page_init() {
2871 if (_large_page_size > default_page_size) { 2909 if (_large_page_size > default_page_size) {
2872 _page_sizes[0] = _large_page_size; 2910 _page_sizes[0] = _large_page_size;
2873 _page_sizes[1] = default_page_size; 2911 _page_sizes[1] = default_page_size;
2874 _page_sizes[2] = 0; 2912 _page_sizes[2] = 0;
2875 } 2913 }
2914
2915 set_coredump_filter();
2876 2916
2877 // Large page support is available on 2.6 or newer kernel, some vendors 2917 // Large page support is available on 2.6 or newer kernel, some vendors
2878 // (e.g. Redhat) have backported it to their 2.4 based distributions. 2918 // (e.g. Redhat) have backported it to their 2.4 based distributions.
2879 // We optimistically assume the support is available. If later it turns out 2919 // We optimistically assume the support is available. If later it turns out
2880 // not true, VM will automatically switch to use regular page size. 2920 // not true, VM will automatically switch to use regular page size.