1 /* 2 * Copyright (c) 1999, 2018, 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 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */ 31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); 32 33 // Information about the protection of the page at address '0' on this os. 34 static bool zero_page_read_protected() { return true; } 35 36 class Linux { 37 friend class os; 38 friend class OSContainer; 39 friend class TestReserveMemorySpecial; 40 41 // For signal-chaining 42 #define MAXSIGNUM 32 43 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions 44 static unsigned int sigs; // mask of signals that have 45 // preinstalled signal handlers 46 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 47 // __sigaction(), signal() is loaded 48 static struct sigaction *(*get_signal_action)(int); 49 static struct sigaction *get_preinstalled_handler(int); 50 static void save_preinstalled_handler(int, struct sigaction&); 51 52 static void check_signal_handler(int sig); 53 54 // For signal flags diagnostics 55 static int sigflags[MAXSIGNUM]; 56 57 static int (*_clock_gettime)(clockid_t, struct timespec *); 58 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); 59 60 static address _initial_thread_stack_bottom; 61 static uintptr_t _initial_thread_stack_size; 62 63 static const char *_glibc_version; 64 static const char *_libpthread_version; 65 66 static bool _is_floating_stack; 67 static bool _is_NPTL; 68 static bool _supports_fast_thread_cpu_time; 69 70 static GrowableArray<int>* _cpu_to_node; 71 static GrowableArray<int>* _nindex_to_node; 72 73 protected: 74 75 static julong _physical_memory; 76 static pthread_t _main_thread; 77 static Mutex* _createThread_lock; 78 static int _page_size; 79 static const int _vm_default_page_size; 80 81 static julong available_memory(); 82 static julong physical_memory() { return _physical_memory; } 83 static void set_physical_memory(julong phys_mem) { _physical_memory = phys_mem; } 84 static int active_processor_count(); 85 86 static void initialize_system_info(); 87 88 static int commit_memory_impl(char* addr, size_t bytes, bool exec); 89 static int commit_memory_impl(char* addr, size_t bytes, 90 size_t alignment_hint, bool exec); 91 92 static void set_glibc_version(const char *s) { _glibc_version = s; } 93 static void set_libpthread_version(const char *s) { _libpthread_version = s; } 94 95 static bool supports_variable_stack_size(); 96 97 static void set_is_NPTL() { _is_NPTL = true; } 98 static void set_is_LinuxThreads() { _is_NPTL = false; } 99 static void set_is_floating_stack() { _is_floating_stack = true; } 100 101 static void rebuild_cpu_to_node_map(); 102 static void rebuild_nindex_to_node_map(); 103 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 104 static GrowableArray<int>* nindex_to_node() { return _nindex_to_node; } 105 106 static size_t find_large_page_size(); 107 static size_t setup_large_page_size(); 108 109 static bool setup_large_page_type(size_t page_size); 110 static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); 111 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 112 113 static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); 114 static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); 115 static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); 116 static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); 117 118 static bool release_memory_special_impl(char* base, size_t bytes); 119 static bool release_memory_special_shm(char* base, size_t bytes); 120 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); 121 122 static void print_full_memory_info(outputStream* st); 123 static void print_container_info(outputStream* st); 124 static void print_distro_info(outputStream* st); 125 static void print_libversion_info(outputStream* st); 126 127 public: 128 static bool _stack_is_executable; 129 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); 130 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); 131 132 static void init_thread_fpu_state(); 133 static int get_fpu_control_word(); 134 static void set_fpu_control_word(int fpu_control); 135 static pthread_t main_thread(void) { return _main_thread; } 136 // returns kernel thread id (similar to LWP id on Solaris), which can be 137 // used to access /proc 138 static pid_t gettid(); 139 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 140 static Mutex* createThread_lock(void) { return _createThread_lock; } 141 static void hotspot_sigmask(Thread* thread); 142 143 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 144 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 145 146 static int page_size(void) { return _page_size; } 147 static void set_page_size(int val) { _page_size = val; } 148 149 static int vm_default_page_size(void) { return _vm_default_page_size; } 150 151 static address ucontext_get_pc(ucontext_t* uc); 152 static intptr_t* ucontext_get_sp(ucontext_t* uc); 153 static intptr_t* ucontext_get_fp(ucontext_t* uc); 154 155 // For Analyzer Forte AsyncGetCallTrace profiling support: 156 // 157 // This interface should be declared in os_linux_i486.hpp, but 158 // that file provides extensions to the os class and not the 159 // Linux class. 160 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 161 intptr_t** ret_sp, intptr_t** ret_fp); 162 163 // This boolean allows users to forward their own non-matching signals 164 // to JVM_handle_linux_signal, harmlessly. 165 static bool signal_handlers_are_installed; 166 167 static int get_our_sigflags(int); 168 static void set_our_sigflags(int, int); 169 static void signal_sets_init(); 170 static void install_signal_handlers(); 171 static void set_signal_handler(int, bool); 172 static bool is_sig_ignored(int sig); 173 174 static sigset_t* unblocked_signals(); 175 static sigset_t* vm_signals(); 176 static sigset_t* allowdebug_blocked_signals(); 177 178 // For signal-chaining 179 static struct sigaction *get_chained_signal_action(int sig); 180 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 181 182 // GNU libc and libpthread version strings 183 static const char *glibc_version() { return _glibc_version; } 184 static const char *libpthread_version() { return _libpthread_version; } 185 186 // NPTL or LinuxThreads? 187 static bool is_LinuxThreads() { return !_is_NPTL; } 188 static bool is_NPTL() { return _is_NPTL; } 189 190 // NPTL is always floating stack. LinuxThreads could be using floating 191 // stack or fixed stack. 192 static bool is_floating_stack() { return _is_floating_stack; } 193 194 static void libpthread_init(); 195 static bool libnuma_init(); 196 static void* libnuma_dlsym(void* handle, const char* name); 197 // libnuma v2 (libnuma_1.2) symbols 198 static void* libnuma_v2_dlsym(void* handle, const char* name); 199 // Minimum stack size a thread can be created with (allowing 200 // the VM to completely create the thread and enter user code) 201 static size_t min_stack_allowed; 202 203 // Return default stack size or guard size for the specified thread type 204 static size_t default_stack_size(os::ThreadType thr_type); 205 static size_t default_guard_size(os::ThreadType thr_type); 206 207 static void capture_initial_stack(size_t max_size); 208 209 // Stack overflow handling 210 static bool manually_expand_stack(JavaThread * t, address addr); 211 static int max_register_window_saves_before_flushing(); 212 213 // Real-time clock functions 214 static void clock_init(void); 215 216 // fast POSIX clocks support 217 static void fast_thread_clock_init(void); 218 219 static inline bool supports_monotonic_clock() { 220 return _clock_gettime != NULL; 221 } 222 223 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 224 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 225 } 226 227 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { 228 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; 229 } 230 231 static bool supports_fast_thread_cpu_time() { 232 return _supports_fast_thread_cpu_time; 233 } 234 235 static jlong fast_thread_cpu_time(clockid_t clockid); 236 237 // pthread_cond clock suppport 238 private: 239 static pthread_condattr_t _condattr[1]; 240 241 public: 242 static pthread_condattr_t* condAttr() { return _condattr; } 243 244 // Stack repair handling 245 246 // none present 247 248 // LinuxThreads work-around for 6292965 249 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); 250 251 private: 252 typedef int (*sched_getcpu_func_t)(void); 253 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 254 typedef int (*numa_max_node_func_t)(void); 255 typedef int (*numa_num_configured_nodes_func_t)(void); 256 typedef int (*numa_available_func_t)(void); 257 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 258 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 259 typedef void (*numa_interleave_memory_v2_func_t)(void *start, size_t size, struct bitmask* mask); 260 261 typedef void (*numa_set_bind_policy_func_t)(int policy); 262 typedef int (*numa_bitmask_isbitset_func_t)(struct bitmask *bmp, unsigned int n); 263 typedef int (*numa_distance_func_t)(int node1, int node2); 264 265 static sched_getcpu_func_t _sched_getcpu; 266 static numa_node_to_cpus_func_t _numa_node_to_cpus; 267 static numa_max_node_func_t _numa_max_node; 268 static numa_num_configured_nodes_func_t _numa_num_configured_nodes; 269 static numa_available_func_t _numa_available; 270 static numa_tonode_memory_func_t _numa_tonode_memory; 271 static numa_interleave_memory_func_t _numa_interleave_memory; 272 static numa_interleave_memory_v2_func_t _numa_interleave_memory_v2; 273 static numa_set_bind_policy_func_t _numa_set_bind_policy; 274 static numa_bitmask_isbitset_func_t _numa_bitmask_isbitset; 275 static numa_distance_func_t _numa_distance; 276 static unsigned long* _numa_all_nodes; 277 static struct bitmask* _numa_all_nodes_ptr; 278 static struct bitmask* _numa_nodes_ptr; 279 280 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 281 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 282 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 283 static void set_numa_num_configured_nodes(numa_num_configured_nodes_func_t func) { _numa_num_configured_nodes = func; } 284 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 285 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 286 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 287 static void set_numa_interleave_memory_v2(numa_interleave_memory_v2_func_t func) { _numa_interleave_memory_v2 = func; } 288 static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; } 289 static void set_numa_bitmask_isbitset(numa_bitmask_isbitset_func_t func) { _numa_bitmask_isbitset = func; } 290 static void set_numa_distance(numa_distance_func_t func) { _numa_distance = func; } 291 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 292 static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = (ptr == NULL ? NULL : *ptr); } 293 static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = (ptr == NULL ? NULL : *ptr); } 294 static int sched_getcpu_syscall(void); 295 public: 296 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 297 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 298 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 299 } 300 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 301 static int numa_num_configured_nodes() { 302 return _numa_num_configured_nodes != NULL ? _numa_num_configured_nodes() : -1; 303 } 304 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 305 static int numa_tonode_memory(void *start, size_t size, int node) { 306 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 307 } 308 static void numa_interleave_memory(void *start, size_t size) { 309 // Use v2 api if available 310 if (_numa_interleave_memory_v2 != NULL && _numa_all_nodes_ptr != NULL) { 311 _numa_interleave_memory_v2(start, size, _numa_all_nodes_ptr); 312 } else if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 313 _numa_interleave_memory(start, size, _numa_all_nodes); 314 } 315 } 316 static void numa_set_bind_policy(int policy) { 317 if (_numa_set_bind_policy != NULL) { 318 _numa_set_bind_policy(policy); 319 } 320 } 321 static int numa_distance(int node1, int node2) { 322 return _numa_distance != NULL ? _numa_distance(node1, node2) : -1; 323 } 324 static int get_node_by_cpu(int cpu_id); 325 static int get_existing_num_nodes(); 326 // Check if numa node is configured (non-zero memory node). 327 static bool isnode_in_configured_nodes(unsigned int n) { 328 if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) { 329 return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n); 330 } else 331 return 0; 332 } 333 // Check if numa node exists in the system (including zero memory nodes). 334 static bool isnode_in_existing_nodes(unsigned int n) { 335 if (_numa_bitmask_isbitset != NULL && _numa_nodes_ptr != NULL) { 336 return _numa_bitmask_isbitset(_numa_nodes_ptr, n); 337 } else if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) { 338 // Not all libnuma API v2 implement numa_nodes_ptr, so it's not possible 339 // to trust the API version for checking its absence. On the other hand, 340 // numa_nodes_ptr found in libnuma 2.0.9 and above is the only way to get 341 // a complete view of all numa nodes in the system, hence numa_nodes_ptr 342 // is used to handle CPU and nodes on architectures (like PowerPC) where 343 // there can exist nodes with CPUs but no memory or vice-versa and the 344 // nodes may be non-contiguous. For most of the architectures, like 345 // x86_64, numa_node_ptr presents the same node set as found in 346 // numa_all_nodes_ptr so it's possible to use numa_all_nodes_ptr as a 347 // substitute. 348 return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n); 349 } else 350 return 0; 351 } 352 }; 353 354 355 class PlatformEvent : public CHeapObj<mtInternal> { 356 private: 357 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line 358 volatile int _Event ; 359 volatile int _nParked ; 360 pthread_mutex_t _mutex [1] ; 361 pthread_cond_t _cond [1] ; 362 double PostPad [2] ; 363 Thread * _Assoc ; 364 365 public: // TODO-FIXME: make dtor private 366 ~PlatformEvent() { guarantee (0, "invariant") ; } 367 368 public: 369 PlatformEvent() { 370 int status; 371 status = pthread_cond_init (_cond, os::Linux::condAttr()); 372 assert_status(status == 0, status, "cond_init"); 373 status = pthread_mutex_init (_mutex, NULL); 374 assert_status(status == 0, status, "mutex_init"); 375 _Event = 0 ; 376 _nParked = 0 ; 377 _Assoc = NULL ; 378 } 379 380 // Use caution with reset() and fired() -- they may require MEMBARs 381 void reset() { _Event = 0 ; } 382 int fired() { return _Event; } 383 void park () ; 384 void unpark () ; 385 int TryPark () ; 386 int park (jlong millis) ; // relative timed-wait only 387 void SetAssociation (Thread * a) { _Assoc = a ; } 388 } ; 389 390 class PlatformParker : public CHeapObj<mtInternal> { 391 protected: 392 enum { 393 REL_INDEX = 0, 394 ABS_INDEX = 1 395 }; 396 int _cur_index; // which cond is in use: -1, 0, 1 397 pthread_mutex_t _mutex [1] ; 398 pthread_cond_t _cond [2] ; // one for relative times and one for abs. 399 400 public: // TODO-FIXME: make dtor private 401 ~PlatformParker() { guarantee (0, "invariant") ; } 402 403 public: 404 PlatformParker() { 405 int status; 406 status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr()); 407 assert_status(status == 0, status, "cond_init rel"); 408 status = pthread_cond_init (&_cond[ABS_INDEX], NULL); 409 assert_status(status == 0, status, "cond_init abs"); 410 status = pthread_mutex_init (_mutex, NULL); 411 assert_status(status == 0, status, "mutex_init"); 412 _cur_index = -1; // mark as unused 413 } 414 }; 415 416 #endif // OS_LINUX_VM_OS_LINUX_HPP