1 /* 2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef OS_LINUX_VM_OS_LINUX_HPP 26 #define OS_LINUX_VM_OS_LINUX_HPP 27 28 // Linux_OS defines the interface to Linux operating systems 29 30 // Information about the protection of the page at address '0' on this os. 31 static bool zero_page_read_protected() { return true; } 32 33 class Linux { 34 friend class os; 35 friend class TestReserveMemorySpecial; 36 37 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 38 // __sigaction(), signal() is loaded 39 static struct sigaction *(*get_signal_action)(int); 40 static struct sigaction *get_preinstalled_handler(int); 41 static void save_preinstalled_handler(int, struct sigaction&); 42 43 static void check_signal_handler(int sig); 44 45 static int (*_clock_gettime)(clockid_t, struct timespec *); 46 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); 47 static int (*_pthread_setname_np)(pthread_t, const char*); 48 49 static address _initial_thread_stack_bottom; 50 static uintptr_t _initial_thread_stack_size; 51 52 static const char *_glibc_version; 53 static const char *_libpthread_version; 54 55 static bool _supports_fast_thread_cpu_time; 56 57 static GrowableArray<int>* _cpu_to_node; 58 static GrowableArray<int>* _nindex_to_node; 59 60 // 0x00000000 = uninitialized, 61 // 0x01000000 = kernel version unknown, 62 // otherwise a 32-bit number: 63 // Ox00AABBCC 64 // AA, Major Version 65 // BB, Minor Version 66 // CC, Fix Version 67 static uint32_t _os_version; 68 69 protected: 70 71 static julong _physical_memory; 72 static pthread_t _main_thread; 73 static Mutex* _createThread_lock; 74 static int _page_size; 75 76 static julong available_memory(); 77 static julong physical_memory() { return _physical_memory; } 78 static void initialize_system_info(); 79 80 static int commit_memory_impl(char* addr, size_t bytes, bool exec); 81 static int commit_memory_impl(char* addr, size_t bytes, 82 size_t alignment_hint, bool exec); 83 84 static void set_glibc_version(const char *s) { _glibc_version = s; } 85 static void set_libpthread_version(const char *s) { _libpthread_version = s; } 86 87 static void rebuild_cpu_to_node_map(); 88 static void rebuild_nindex_to_node_map(); 89 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 90 static GrowableArray<int>* nindex_to_node() { return _nindex_to_node; } 91 92 static size_t find_large_page_size(); 93 static size_t setup_large_page_size(); 94 95 static bool setup_large_page_type(size_t page_size); 96 static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); 97 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 98 99 static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); 100 static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); 101 static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); 102 static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); 103 104 static bool release_memory_special_impl(char* base, size_t bytes); 105 static bool release_memory_special_shm(char* base, size_t bytes); 106 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); 107 108 static void print_full_memory_info(outputStream* st); 109 static void print_distro_info(outputStream* st); 110 static void print_libversion_info(outputStream* st); 111 112 public: 113 static bool _stack_is_executable; 114 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); 115 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); 116 117 static void init_thread_fpu_state(); 118 static int get_fpu_control_word(); 119 static void set_fpu_control_word(int fpu_control); 120 static pthread_t main_thread(void) { return _main_thread; } 121 // returns kernel thread id (similar to LWP id on Solaris), which can be 122 // used to access /proc 123 static pid_t gettid(); 124 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 125 static Mutex* createThread_lock(void) { return _createThread_lock; } 126 static void hotspot_sigmask(Thread* thread); 127 128 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 129 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 130 static bool is_initial_thread(void); 131 132 static int page_size(void) { return _page_size; } 133 static void set_page_size(int val) { _page_size = val; } 134 135 static address ucontext_get_pc(const ucontext_t* uc); 136 static void ucontext_set_pc(ucontext_t* uc, address pc); 137 static intptr_t* ucontext_get_sp(const ucontext_t* uc); 138 static intptr_t* ucontext_get_fp(const ucontext_t* uc); 139 140 // For Analyzer Forte AsyncGetCallTrace profiling support: 141 // 142 // This interface should be declared in os_linux_i486.hpp, but 143 // that file provides extensions to the os class and not the 144 // Linux class. 145 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, const ucontext_t* uc, 146 intptr_t** ret_sp, intptr_t** ret_fp); 147 148 static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr); 149 150 // This boolean allows users to forward their own non-matching signals 151 // to JVM_handle_linux_signal, harmlessly. 152 static bool signal_handlers_are_installed; 153 154 static int get_our_sigflags(int); 155 static void set_our_sigflags(int, int); 156 static void signal_sets_init(); 157 static void install_signal_handlers(); 158 static void set_signal_handler(int, bool); 159 static bool is_sig_ignored(int sig); 160 161 static sigset_t* unblocked_signals(); 162 static sigset_t* vm_signals(); 163 164 // For signal-chaining 165 static struct sigaction *get_chained_signal_action(int sig); 166 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 167 168 // GNU libc and libpthread version strings 169 static const char *glibc_version() { return _glibc_version; } 170 static const char *libpthread_version() { return _libpthread_version; } 171 172 static void libpthread_init(); 173 static void sched_getcpu_init(); 174 static bool libnuma_init(); 175 static void* libnuma_dlsym(void* handle, const char* name); 176 // libnuma v2 (libnuma_1.2) symbols 177 static void* libnuma_v2_dlsym(void* handle, const char* name); 178 179 // Return default guard size for the specified thread type 180 static size_t default_guard_size(os::ThreadType thr_type); 181 182 static void capture_initial_stack(size_t max_size); 183 184 // Stack overflow handling 185 static bool manually_expand_stack(JavaThread * t, address addr); 186 static int max_register_window_saves_before_flushing(); 187 188 // Real-time clock functions 189 static void clock_init(void); 190 191 // fast POSIX clocks support 192 static void fast_thread_clock_init(void); 193 194 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 195 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 196 } 197 198 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { 199 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; 200 } 201 202 static bool supports_fast_thread_cpu_time() { 203 return _supports_fast_thread_cpu_time; 204 } 205 206 static jlong fast_thread_cpu_time(clockid_t clockid); 207 208 static void initialize_os_info(); 209 static bool os_version_is_known(); 210 static uint32_t os_version(); 211 212 // Stack repair handling 213 214 // none present 215 216 private: 217 typedef int (*sched_getcpu_func_t)(void); 218 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 219 typedef int (*numa_max_node_func_t)(void); 220 typedef int (*numa_num_configured_nodes_func_t)(void); 221 typedef int (*numa_available_func_t)(void); 222 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 223 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 224 typedef void (*numa_interleave_memory_v2_func_t)(void *start, size_t size, struct bitmask* mask); 225 226 typedef void (*numa_set_bind_policy_func_t)(int policy); 227 typedef int (*numa_bitmask_isbitset_func_t)(struct bitmask *bmp, unsigned int n); 228 typedef int (*numa_distance_func_t)(int node1, int node2); 229 230 static sched_getcpu_func_t _sched_getcpu; 231 static numa_node_to_cpus_func_t _numa_node_to_cpus; 232 static numa_max_node_func_t _numa_max_node; 233 static numa_num_configured_nodes_func_t _numa_num_configured_nodes; 234 static numa_available_func_t _numa_available; 235 static numa_tonode_memory_func_t _numa_tonode_memory; 236 static numa_interleave_memory_func_t _numa_interleave_memory; 237 static numa_interleave_memory_v2_func_t _numa_interleave_memory_v2; 238 static numa_set_bind_policy_func_t _numa_set_bind_policy; 239 static numa_bitmask_isbitset_func_t _numa_bitmask_isbitset; 240 static numa_distance_func_t _numa_distance; 241 static unsigned long* _numa_all_nodes; 242 static struct bitmask* _numa_all_nodes_ptr; 243 static struct bitmask* _numa_nodes_ptr; 244 245 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 246 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 247 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 248 static void set_numa_num_configured_nodes(numa_num_configured_nodes_func_t func) { _numa_num_configured_nodes = func; } 249 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 250 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 251 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 252 static void set_numa_interleave_memory_v2(numa_interleave_memory_v2_func_t func) { _numa_interleave_memory_v2 = func; } 253 static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; } 254 static void set_numa_bitmask_isbitset(numa_bitmask_isbitset_func_t func) { _numa_bitmask_isbitset = func; } 255 static void set_numa_distance(numa_distance_func_t func) { _numa_distance = func; } 256 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 257 static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = *ptr; } 258 static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = *ptr; } 259 static int sched_getcpu_syscall(void); 260 public: 261 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 262 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 263 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 264 } 265 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 266 static int numa_num_configured_nodes() { 267 return _numa_num_configured_nodes != NULL ? _numa_num_configured_nodes() : -1; 268 } 269 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 270 static int numa_tonode_memory(void *start, size_t size, int node) { 271 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 272 } 273 static void numa_interleave_memory(void *start, size_t size) { 274 // Use v2 api if available 275 if (_numa_interleave_memory_v2 != NULL && _numa_all_nodes_ptr != NULL) { 276 _numa_interleave_memory_v2(start, size, _numa_all_nodes_ptr); 277 } else if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 278 _numa_interleave_memory(start, size, _numa_all_nodes); 279 } 280 } 281 static void numa_set_bind_policy(int policy) { 282 if (_numa_set_bind_policy != NULL) { 283 _numa_set_bind_policy(policy); 284 } 285 } 286 static int numa_distance(int node1, int node2) { 287 return _numa_distance != NULL ? _numa_distance(node1, node2) : -1; 288 } 289 static int get_node_by_cpu(int cpu_id); 290 static int get_existing_num_nodes(); 291 // Check if numa node is configured (non-zero memory node). 292 static bool isnode_in_configured_nodes(unsigned int n) { 293 if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) { 294 return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n); 295 } else 296 return 0; 297 } 298 // Check if numa node exists in the system (including zero memory nodes). 299 static bool isnode_in_existing_nodes(unsigned int n) { 300 if (_numa_bitmask_isbitset != NULL && _numa_nodes_ptr != NULL) { 301 return _numa_bitmask_isbitset(_numa_nodes_ptr, n); 302 } else 303 return 0; 304 } 305 }; 306 307 #endif // OS_LINUX_VM_OS_LINUX_HPP