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 class Linux { 34 friend class os; 35 friend class TestReserveMemorySpecial; 36 37 // For signal-chaining 38 #define MAXSIGNUM 32 39 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions 40 static unsigned int sigs; // mask of signals that have 41 // preinstalled signal handlers 42 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 43 // __sigaction(), signal() is loaded 44 static struct sigaction *(*get_signal_action)(int); 45 static struct sigaction *get_preinstalled_handler(int); 46 static void save_preinstalled_handler(int, struct sigaction&); 47 48 static void check_signal_handler(int sig); 49 50 // For signal flags diagnostics 51 static int sigflags[MAXSIGNUM]; 52 53 static int (*_clock_gettime)(clockid_t, struct timespec *); 54 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); 55 56 static address _initial_thread_stack_bottom; 57 static uintptr_t _initial_thread_stack_size; 58 59 static const char *_glibc_version; 60 static const char *_libpthread_version; 61 62 static bool _is_floating_stack; 63 static bool _is_NPTL; 64 static bool _supports_fast_thread_cpu_time; 65 66 static GrowableArray<int>* _cpu_to_node; 67 68 protected: 69 70 static julong _physical_memory; 71 static pthread_t _main_thread; 72 static Mutex* _createThread_lock; 73 static int _page_size; 74 static const int _vm_default_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 bool supports_variable_stack_size(); 88 89 static void set_is_NPTL() { _is_NPTL = true; } 90 static void set_is_LinuxThreads() { _is_NPTL = false; } 91 static void set_is_floating_stack() { _is_floating_stack = true; } 92 93 static void rebuild_cpu_to_node_map(); 94 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 95 96 static size_t find_large_page_size(); 97 static size_t setup_large_page_size(); 98 99 static bool setup_large_page_type(size_t page_size); 100 static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); 101 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 102 103 static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); 104 static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); 105 static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); 106 static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); 107 108 static bool release_memory_special_shm(char* base, size_t bytes); 109 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); 110 111 static void print_full_memory_info(outputStream* st); 112 static void print_distro_info(outputStream* st); 113 static void print_libversion_info(outputStream* st); 114 115 public: 116 static bool _stack_is_executable; 117 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); 118 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); 119 120 static void init_thread_fpu_state(); 121 static int get_fpu_control_word(); 122 static void set_fpu_control_word(int fpu_control); 123 static pthread_t main_thread(void) { return _main_thread; } 124 // returns kernel thread id (similar to LWP id on Solaris), which can be 125 // used to access /proc 126 static pid_t gettid(); 127 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 128 static Mutex* createThread_lock(void) { return _createThread_lock; } 129 static void hotspot_sigmask(Thread* thread); 130 131 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 132 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 133 static bool is_initial_thread(void); 134 135 static int page_size(void) { return _page_size; } 136 static void set_page_size(int val) { _page_size = val; } 137 138 static int vm_default_page_size(void) { return _vm_default_page_size; } 139 140 static address ucontext_get_pc(ucontext_t* uc); 141 static intptr_t* ucontext_get_sp(ucontext_t* uc); 142 static intptr_t* ucontext_get_fp(ucontext_t* uc); 143 144 // For Analyzer Forte AsyncGetCallTrace profiling support: 145 // 146 // This interface should be declared in os_linux_i486.hpp, but 147 // that file provides extensions to the os class and not the 148 // Linux class. 149 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 150 intptr_t** ret_sp, intptr_t** ret_fp); 151 152 // This boolean allows users to forward their own non-matching signals 153 // to JVM_handle_linux_signal, harmlessly. 154 static bool signal_handlers_are_installed; 155 156 static int get_our_sigflags(int); 157 static void set_our_sigflags(int, int); 158 static void signal_sets_init(); 159 static void install_signal_handlers(); 160 static void set_signal_handler(int, bool); 161 static bool is_sig_ignored(int sig); 162 163 static sigset_t* unblocked_signals(); 164 static sigset_t* vm_signals(); 165 static sigset_t* allowdebug_blocked_signals(); 166 167 // For signal-chaining 168 static struct sigaction *get_chained_signal_action(int sig); 169 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 170 171 // GNU libc and libpthread version strings 172 static const char *glibc_version() { return _glibc_version; } 173 static const char *libpthread_version() { return _libpthread_version; } 174 175 // NPTL or LinuxThreads? 176 static bool is_LinuxThreads() { return !_is_NPTL; } 177 static bool is_NPTL() { return _is_NPTL; } 178 179 // NPTL is always floating stack. LinuxThreads could be using floating 180 // stack or fixed stack. 181 static bool is_floating_stack() { return _is_floating_stack; } 182 183 static void libpthread_init(); 184 static bool libnuma_init(); 185 static void* libnuma_dlsym(void* handle, const char* name); 186 // Minimum stack size a thread can be created with (allowing 187 // the VM to completely create the thread and enter user code) 188 static size_t min_stack_allowed; 189 190 // Return default stack size or guard size for the specified thread type 191 static size_t default_stack_size(os::ThreadType thr_type); 192 static size_t default_guard_size(os::ThreadType thr_type); 193 194 static void capture_initial_stack(size_t max_size); 195 196 // Stack overflow handling 197 static bool manually_expand_stack(JavaThread * t, address addr); 198 static int max_register_window_saves_before_flushing(); 199 200 // Real-time clock functions 201 static void clock_init(void); 202 203 // fast POSIX clocks support 204 static void fast_thread_clock_init(void); 205 206 static inline bool supports_monotonic_clock() { 207 return _clock_gettime != NULL; 208 } 209 210 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 211 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 212 } 213 214 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { 215 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; 216 } 217 218 static bool supports_fast_thread_cpu_time() { 219 return _supports_fast_thread_cpu_time; 220 } 221 222 static jlong fast_thread_cpu_time(clockid_t clockid); 223 224 // Stack repair handling 225 226 // none present 227 228 // LinuxThreads work-around for 6292965 229 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); 230 231 private: 232 typedef int (*sched_getcpu_func_t)(void); 233 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 234 typedef int (*numa_max_node_func_t)(void); 235 typedef int (*numa_available_func_t)(void); 236 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 237 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 238 239 static sched_getcpu_func_t _sched_getcpu; 240 static numa_node_to_cpus_func_t _numa_node_to_cpus; 241 static numa_max_node_func_t _numa_max_node; 242 static numa_available_func_t _numa_available; 243 static numa_tonode_memory_func_t _numa_tonode_memory; 244 static numa_interleave_memory_func_t _numa_interleave_memory; 245 static unsigned long* _numa_all_nodes; 246 247 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 248 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 249 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 250 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 251 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 252 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 253 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 254 static int sched_getcpu_syscall(void); 255 public: 256 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 257 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 258 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 259 } 260 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 261 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 262 static int numa_tonode_memory(void *start, size_t size, int node) { 263 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 264 } 265 static void numa_interleave_memory(void *start, size_t size) { 266 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 267 _numa_interleave_memory(start, size, _numa_all_nodes); 268 } 269 } 270 static int get_node_by_cpu(int cpu_id); 271 }; 272 273 274 class PlatformEvent : public CHeapObj<mtInternal> { 275 private: 276 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line 277 volatile int _Event ; 278 volatile int _nParked ; 279 pthread_mutex_t _mutex [1] ; 280 pthread_cond_t _cond [1] ; 281 double PostPad [2] ; 282 Thread * _Assoc ; 283 284 public: // TODO-FIXME: make dtor private 285 ~PlatformEvent() { guarantee (0, "invariant") ; } 286 287 public: 288 PlatformEvent() { 289 int status; 290 status = pthread_cond_init (_cond, NULL); 291 assert_status(status == 0, status, "cond_init"); 292 status = pthread_mutex_init (_mutex, NULL); 293 assert_status(status == 0, status, "mutex_init"); 294 _Event = 0 ; 295 _nParked = 0 ; 296 _Assoc = NULL ; 297 } 298 299 // Use caution with reset() and fired() -- they may require MEMBARs 300 void reset() { _Event = 0 ; } 301 int fired() { return _Event; } 302 void park () ; 303 void unpark () ; 304 int TryPark () ; 305 int park (jlong millis) ; 306 void SetAssociation (Thread * a) { _Assoc = a ; } 307 } ; 308 309 class PlatformParker : public CHeapObj<mtInternal> { 310 protected: 311 pthread_mutex_t _mutex [1] ; 312 pthread_cond_t _cond [1] ; 313 314 public: // TODO-FIXME: make dtor private 315 ~PlatformParker() { guarantee (0, "invariant") ; } 316 317 public: 318 PlatformParker() { 319 int status; 320 status = pthread_cond_init (_cond, NULL); 321 assert_status(status == 0, status, "cond_init"); 322 status = pthread_mutex_init (_mutex, NULL); 323 assert_status(status == 0, status, "mutex_init"); 324 } 325 }; 326 327 #endif // OS_LINUX_VM_OS_LINUX_HPP