1 /* 2 * Copyright (c) 1999, 2013, 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 TestReserveMemorySpecial; 39 40 // For signal-chaining 41 #define MAXSIGNUM 32 42 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions 43 static unsigned int sigs; // mask of signals that have 44 // preinstalled signal handlers 45 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 46 // __sigaction(), signal() is loaded 47 static struct sigaction *(*get_signal_action)(int); 48 static struct sigaction *get_preinstalled_handler(int); 49 static void save_preinstalled_handler(int, struct sigaction&); 50 51 static void check_signal_handler(int sig); 52 53 // For signal flags diagnostics 54 static int sigflags[MAXSIGNUM]; 55 56 static int (*_clock_gettime)(clockid_t, struct timespec *); 57 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); 58 59 static address _initial_thread_stack_bottom; 60 static uintptr_t _initial_thread_stack_size; 61 62 static const char *_glibc_version; 63 static const char *_libpthread_version; 64 65 static bool _is_floating_stack; 66 static bool _is_NPTL; 67 static bool _supports_fast_thread_cpu_time; 68 69 static GrowableArray<int>* _cpu_to_node; 70 static GrowableArray<int>* _nindex_to_node; 71 72 protected: 73 74 static julong _physical_memory; 75 static pthread_t _main_thread; 76 static Mutex* _createThread_lock; 77 static int _page_size; 78 static const int _vm_default_page_size; 79 80 static julong available_memory(); 81 static julong physical_memory() { return _physical_memory; } 82 static void initialize_system_info(); 83 84 static int commit_memory_impl(char* addr, size_t bytes, bool exec); 85 static int commit_memory_impl(char* addr, size_t bytes, 86 size_t alignment_hint, bool exec); 87 88 static void set_glibc_version(const char *s) { _glibc_version = s; } 89 static void set_libpthread_version(const char *s) { _libpthread_version = s; } 90 91 static bool supports_variable_stack_size(); 92 93 static void set_is_NPTL() { _is_NPTL = true; } 94 static void set_is_LinuxThreads() { _is_NPTL = false; } 95 static void set_is_floating_stack() { _is_floating_stack = true; } 96 97 static void rebuild_cpu_to_node_map(); 98 static void rebuild_nindex_to_node_map(); 99 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 100 static GrowableArray<int>* nindex_to_node() { return _nindex_to_node; } 101 102 static size_t find_large_page_size(); 103 static size_t setup_large_page_size(); 104 105 static bool setup_large_page_type(size_t page_size); 106 static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); 107 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 108 109 static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); 110 static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); 111 static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); 112 static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); 113 114 static bool release_memory_special_impl(char* base, size_t bytes); 115 static bool release_memory_special_shm(char* base, size_t bytes); 116 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); 117 118 static void print_full_memory_info(outputStream* st); 119 static void print_distro_info(outputStream* st); 120 static void print_libversion_info(outputStream* st); 121 122 public: 123 static bool _stack_is_executable; 124 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); 125 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); 126 127 static void init_thread_fpu_state(); 128 static int get_fpu_control_word(); 129 static void set_fpu_control_word(int fpu_control); 130 static pthread_t main_thread(void) { return _main_thread; } 131 // returns kernel thread id (similar to LWP id on Solaris), which can be 132 // used to access /proc 133 static pid_t gettid(); 134 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 135 static Mutex* createThread_lock(void) { return _createThread_lock; } 136 static void hotspot_sigmask(Thread* thread); 137 138 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 139 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 140 static bool is_initial_thread(void); 141 142 static int page_size(void) { return _page_size; } 143 static void set_page_size(int val) { _page_size = val; } 144 145 static int vm_default_page_size(void) { return _vm_default_page_size; } 146 147 static address ucontext_get_pc(ucontext_t* uc); 148 static intptr_t* ucontext_get_sp(ucontext_t* uc); 149 static intptr_t* ucontext_get_fp(ucontext_t* uc); 150 151 // For Analyzer Forte AsyncGetCallTrace profiling support: 152 // 153 // This interface should be declared in os_linux_i486.hpp, but 154 // that file provides extensions to the os class and not the 155 // Linux class. 156 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 157 intptr_t** ret_sp, intptr_t** ret_fp); 158 159 // This boolean allows users to forward their own non-matching signals 160 // to JVM_handle_linux_signal, harmlessly. 161 static bool signal_handlers_are_installed; 162 163 static int get_our_sigflags(int); 164 static void set_our_sigflags(int, int); 165 static void signal_sets_init(); 166 static void install_signal_handlers(); 167 static void set_signal_handler(int, bool); 168 static bool is_sig_ignored(int sig); 169 170 static sigset_t* unblocked_signals(); 171 static sigset_t* vm_signals(); 172 static sigset_t* allowdebug_blocked_signals(); 173 174 // For signal-chaining 175 static struct sigaction *get_chained_signal_action(int sig); 176 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 177 178 // GNU libc and libpthread version strings 179 static const char *glibc_version() { return _glibc_version; } 180 static const char *libpthread_version() { return _libpthread_version; } 181 182 // NPTL or LinuxThreads? 183 static bool is_LinuxThreads() { return !_is_NPTL; } 184 static bool is_NPTL() { return _is_NPTL; } 185 186 // NPTL is always floating stack. LinuxThreads could be using floating 187 // stack or fixed stack. 188 static bool is_floating_stack() { return _is_floating_stack; } 189 190 static void libpthread_init(); 191 static bool libnuma_init(); 192 static void* libnuma_dlsym(void* handle, const char* name); 193 // Minimum stack size a thread can be created with (allowing 194 // the VM to completely create the thread and enter user code) 195 static size_t min_stack_allowed; 196 197 // Return default stack size or guard size for the specified thread type 198 static size_t default_stack_size(os::ThreadType thr_type); 199 static size_t default_guard_size(os::ThreadType thr_type); 200 201 static void capture_initial_stack(size_t max_size); 202 203 // Stack overflow handling 204 static bool manually_expand_stack(JavaThread * t, address addr); 205 static int max_register_window_saves_before_flushing(); 206 207 // Real-time clock functions 208 static void clock_init(void); 209 210 // fast POSIX clocks support 211 static void fast_thread_clock_init(void); 212 213 static inline bool supports_monotonic_clock() { 214 return _clock_gettime != NULL; 215 } 216 217 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 218 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 219 } 220 221 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { 222 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; 223 } 224 225 static bool supports_fast_thread_cpu_time() { 226 return _supports_fast_thread_cpu_time; 227 } 228 229 static jlong fast_thread_cpu_time(clockid_t clockid); 230 231 // pthread_cond clock suppport 232 private: 233 static pthread_condattr_t _condattr[1]; 234 235 public: 236 static pthread_condattr_t* condAttr() { return _condattr; } 237 238 // Stack repair handling 239 240 // none present 241 242 // LinuxThreads work-around for 6292965 243 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); 244 245 private: 246 typedef int (*sched_getcpu_func_t)(void); 247 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 248 typedef int (*numa_max_node_func_t)(void); 249 typedef int (*numa_num_configured_nodes_func_t)(void); 250 typedef int (*numa_available_func_t)(void); 251 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 252 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 253 typedef void (*numa_set_bind_policy_func_t)(int policy); 254 typedef int (*numa_bitmask_isbitset_func_t)(struct bitmask *bmp, unsigned int n); 255 typedef int (*numa_distance_func_t)(int node1, int node2); 256 257 static sched_getcpu_func_t _sched_getcpu; 258 static numa_node_to_cpus_func_t _numa_node_to_cpus; 259 static numa_max_node_func_t _numa_max_node; 260 static numa_num_configured_nodes_func_t _numa_num_configured_nodes; 261 static numa_available_func_t _numa_available; 262 static numa_tonode_memory_func_t _numa_tonode_memory; 263 static numa_interleave_memory_func_t _numa_interleave_memory; 264 static numa_set_bind_policy_func_t _numa_set_bind_policy; 265 static numa_bitmask_isbitset_func_t _numa_bitmask_isbitset; 266 static numa_distance_func_t _numa_distance; 267 static unsigned long* _numa_all_nodes; 268 static struct bitmask* _numa_all_nodes_ptr; 269 static struct bitmask* _numa_nodes_ptr; 270 271 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 272 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 273 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 274 static void set_numa_num_configured_nodes(numa_num_configured_nodes_func_t func) { _numa_num_configured_nodes = func; } 275 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 276 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 277 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 278 static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; } 279 static void set_numa_bitmask_isbitset(numa_bitmask_isbitset_func_t func) { _numa_bitmask_isbitset = func; } 280 static void set_numa_distance(numa_distance_func_t func) { _numa_distance = func; } 281 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 282 static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = *ptr; } 283 static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = *ptr; } 284 static int sched_getcpu_syscall(void); 285 public: 286 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 287 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 288 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 289 } 290 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 291 static int numa_num_configured_nodes() { 292 return _numa_num_configured_nodes != NULL ? _numa_num_configured_nodes() : -1; 293 } 294 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 295 static int numa_tonode_memory(void *start, size_t size, int node) { 296 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 297 } 298 static void numa_interleave_memory(void *start, size_t size) { 299 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 300 _numa_interleave_memory(start, size, _numa_all_nodes); 301 } 302 } 303 static void numa_set_bind_policy(int policy) { 304 if (_numa_set_bind_policy != NULL) { 305 _numa_set_bind_policy(policy); 306 } 307 } 308 static int numa_distance(int node1, int node2) { 309 return _numa_distance != NULL ? _numa_distance(node1, node2) : -1; 310 } 311 static int get_node_by_cpu(int cpu_id); 312 static int get_existing_num_nodes(); 313 // Check if numa node is configured (non-zero memory node). 314 static bool isnode_in_configured_nodes(unsigned int n) { 315 if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) { 316 return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n); 317 } else 318 return 0; 319 } 320 // Check if numa node exists in the system (including zero memory nodes). 321 static bool isnode_in_existing_nodes(unsigned int n) { 322 if (_numa_bitmask_isbitset != NULL && _numa_nodes_ptr != NULL) { 323 return _numa_bitmask_isbitset(_numa_nodes_ptr, n); 324 } else 325 return 0; 326 } 327 }; 328 329 330 class PlatformEvent : public CHeapObj<mtInternal> { 331 private: 332 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line 333 volatile int _Event ; 334 volatile int _nParked ; 335 pthread_mutex_t _mutex [1] ; 336 pthread_cond_t _cond [1] ; 337 double PostPad [2] ; 338 Thread * _Assoc ; 339 340 public: // TODO-FIXME: make dtor private 341 ~PlatformEvent() { guarantee (0, "invariant") ; } 342 343 public: 344 PlatformEvent() { 345 int status; 346 status = pthread_cond_init (_cond, os::Linux::condAttr()); 347 assert_status(status == 0, status, "cond_init"); 348 status = pthread_mutex_init (_mutex, NULL); 349 assert_status(status == 0, status, "mutex_init"); 350 _Event = 0 ; 351 _nParked = 0 ; 352 _Assoc = NULL ; 353 } 354 355 // Use caution with reset() and fired() -- they may require MEMBARs 356 void reset() { _Event = 0 ; } 357 int fired() { return _Event; } 358 void park () ; 359 void unpark () ; 360 int TryPark () ; 361 int park (jlong millis) ; // relative timed-wait only 362 void SetAssociation (Thread * a) { _Assoc = a ; } 363 } ; 364 365 class PlatformParker : public CHeapObj<mtInternal> { 366 protected: 367 enum { 368 REL_INDEX = 0, 369 ABS_INDEX = 1 370 }; 371 int _cur_index; // which cond is in use: -1, 0, 1 372 pthread_mutex_t _mutex [1] ; 373 pthread_cond_t _cond [2] ; // one for relative times and one for abs. 374 375 public: // TODO-FIXME: make dtor private 376 ~PlatformParker() { guarantee (0, "invariant") ; } 377 378 public: 379 PlatformParker() { 380 int status; 381 status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr()); 382 assert_status(status == 0, status, "cond_init rel"); 383 status = pthread_cond_init (&_cond[ABS_INDEX], NULL); 384 assert_status(status == 0, status, "cond_init abs"); 385 status = pthread_mutex_init (_mutex, NULL); 386 assert_status(status == 0, status, "mutex_init"); 387 _cur_index = -1; // mark as unused 388 } 389 }; 390 391 #endif // OS_LINUX_VM_OS_LINUX_HPP