os_linux.hpp revision 7051:0420e825bb3c
1/* 2 * Copyright (c) 1999, 2014, 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 31typedef 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. 34static bool zero_page_read_protected() { return true; } 35 36class 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 71 protected: 72 73 static julong _physical_memory; 74 static pthread_t _main_thread; 75 static Mutex* _createThread_lock; 76 static int _page_size; 77 static const int _vm_default_page_size; 78 79 static julong available_memory(); 80 static julong physical_memory() { return _physical_memory; } 81 static void initialize_system_info(); 82 83 static int commit_memory_impl(char* addr, size_t bytes, bool exec); 84 static int commit_memory_impl(char* addr, size_t bytes, 85 size_t alignment_hint, bool exec); 86 87 static void set_glibc_version(const char *s) { _glibc_version = s; } 88 static void set_libpthread_version(const char *s) { _libpthread_version = s; } 89 90 static bool supports_variable_stack_size(); 91 92 static void set_is_NPTL() { _is_NPTL = true; } 93 static void set_is_LinuxThreads() { _is_NPTL = false; } 94 static void set_is_floating_stack() { _is_floating_stack = true; } 95 96 static void rebuild_cpu_to_node_map(); 97 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 98 99 static size_t find_large_page_size(); 100 static size_t setup_large_page_size(); 101 102 static bool setup_large_page_type(size_t page_size); 103 static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); 104 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 105 106 static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); 107 static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); 108 static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); 109 static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); 110 111 static bool release_memory_special_impl(char* base, size_t bytes); 112 static bool release_memory_special_shm(char* base, size_t bytes); 113 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); 114 115 static void print_full_memory_info(outputStream* st); 116 static void print_distro_info(outputStream* st); 117 static void print_libversion_info(outputStream* st); 118 119 public: 120 static bool _stack_is_executable; 121 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); 122 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); 123 124 static void init_thread_fpu_state(); 125 static int get_fpu_control_word(); 126 static void set_fpu_control_word(int fpu_control); 127 static pthread_t main_thread(void) { return _main_thread; } 128 // returns kernel thread id (similar to LWP id on Solaris), which can be 129 // used to access /proc 130 static pid_t gettid(); 131 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 132 static Mutex* createThread_lock(void) { return _createThread_lock; } 133 static void hotspot_sigmask(Thread* thread); 134 135 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 136 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 137 static bool is_initial_thread(void); 138 139 static int page_size(void) { return _page_size; } 140 static void set_page_size(int val) { _page_size = val; } 141 142 static int vm_default_page_size(void) { return _vm_default_page_size; } 143 144 static address ucontext_get_pc(ucontext_t* uc); 145 static intptr_t* ucontext_get_sp(ucontext_t* uc); 146 static intptr_t* ucontext_get_fp(ucontext_t* uc); 147 148 // For Analyzer Forte AsyncGetCallTrace profiling support: 149 // 150 // This interface should be declared in os_linux_i486.hpp, but 151 // that file provides extensions to the os class and not the 152 // Linux class. 153 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 154 intptr_t** ret_sp, intptr_t** ret_fp); 155 156 // This boolean allows users to forward their own non-matching signals 157 // to JVM_handle_linux_signal, harmlessly. 158 static bool signal_handlers_are_installed; 159 160 static int get_our_sigflags(int); 161 static void set_our_sigflags(int, int); 162 static void signal_sets_init(); 163 static void install_signal_handlers(); 164 static void set_signal_handler(int, bool); 165 static bool is_sig_ignored(int sig); 166 167 static sigset_t* unblocked_signals(); 168 static sigset_t* vm_signals(); 169 static sigset_t* allowdebug_blocked_signals(); 170 171 // For signal-chaining 172 static struct sigaction *get_chained_signal_action(int sig); 173 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 174 175 // GNU libc and libpthread version strings 176 static const char *glibc_version() { return _glibc_version; } 177 static const char *libpthread_version() { return _libpthread_version; } 178 179 // NPTL or LinuxThreads? 180 static bool is_LinuxThreads() { return !_is_NPTL; } 181 static bool is_NPTL() { return _is_NPTL; } 182 183 // NPTL is always floating stack. LinuxThreads could be using floating 184 // stack or fixed stack. 185 static bool is_floating_stack() { return _is_floating_stack; } 186 187 static void libpthread_init(); 188 static bool libnuma_init(); 189 static void* libnuma_dlsym(void* handle, const char* name); 190 // Minimum stack size a thread can be created with (allowing 191 // the VM to completely create the thread and enter user code) 192 static size_t min_stack_allowed; 193 194 // Return default stack size or guard size for the specified thread type 195 static size_t default_stack_size(os::ThreadType thr_type); 196 static size_t default_guard_size(os::ThreadType thr_type); 197 198 static void capture_initial_stack(size_t max_size); 199 200 // Stack overflow handling 201 static bool manually_expand_stack(JavaThread * t, address addr); 202 static int max_register_window_saves_before_flushing(); 203 204 // Real-time clock functions 205 static void clock_init(void); 206 207 // fast POSIX clocks support 208 static void fast_thread_clock_init(void); 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 // pthread_cond clock suppport 225 private: 226 static pthread_condattr_t _condattr[1]; 227 228 public: 229 static pthread_condattr_t* condAttr() { return _condattr; } 230 231 // Stack repair handling 232 233 // none present 234 235 // LinuxThreads work-around for 6292965 236 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); 237 238 private: 239 typedef int (*sched_getcpu_func_t)(void); 240 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 241 typedef int (*numa_max_node_func_t)(void); 242 typedef int (*numa_available_func_t)(void); 243 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 244 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 245 typedef void (*numa_set_bind_policy_func_t)(int policy); 246 247 static sched_getcpu_func_t _sched_getcpu; 248 static numa_node_to_cpus_func_t _numa_node_to_cpus; 249 static numa_max_node_func_t _numa_max_node; 250 static numa_available_func_t _numa_available; 251 static numa_tonode_memory_func_t _numa_tonode_memory; 252 static numa_interleave_memory_func_t _numa_interleave_memory; 253 static numa_set_bind_policy_func_t _numa_set_bind_policy; 254 static unsigned long* _numa_all_nodes; 255 256 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 257 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 258 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 259 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 260 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 261 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 262 static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; } 263 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 264 static int sched_getcpu_syscall(void); 265 public: 266 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 267 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 268 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 269 } 270 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 271 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 272 static int numa_tonode_memory(void *start, size_t size, int node) { 273 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 274 } 275 static void numa_interleave_memory(void *start, size_t size) { 276 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 277 _numa_interleave_memory(start, size, _numa_all_nodes); 278 } 279 } 280 static void numa_set_bind_policy(int policy) { 281 if (_numa_set_bind_policy != NULL) { 282 _numa_set_bind_policy(policy); 283 } 284 } 285 static int get_node_by_cpu(int cpu_id); 286}; 287 288 289class PlatformEvent : public CHeapObj<mtInternal> { 290 private: 291 double CachePad[4]; // increase odds that _mutex is sole occupant of cache line 292 volatile int _Event; 293 volatile int _nParked; 294 pthread_mutex_t _mutex[1]; 295 pthread_cond_t _cond[1]; 296 double PostPad[2]; 297 Thread * _Assoc; 298 299 public: // TODO-FIXME: make dtor private 300 ~PlatformEvent() { guarantee(0, "invariant"); } 301 302 public: 303 PlatformEvent() { 304 int status; 305 status = pthread_cond_init(_cond, os::Linux::condAttr()); 306 assert_status(status == 0, status, "cond_init"); 307 status = pthread_mutex_init(_mutex, NULL); 308 assert_status(status == 0, status, "mutex_init"); 309 _Event = 0; 310 _nParked = 0; 311 _Assoc = NULL; 312 } 313 314 // Use caution with reset() and fired() -- they may require MEMBARs 315 void reset() { _Event = 0; } 316 int fired() { return _Event; } 317 void park(); 318 void unpark(); 319 int park(jlong millis); // relative timed-wait only 320 void SetAssociation(Thread * a) { _Assoc = a; } 321}; 322 323class PlatformParker : public CHeapObj<mtInternal> { 324 protected: 325 enum { 326 REL_INDEX = 0, 327 ABS_INDEX = 1 328 }; 329 int _cur_index; // which cond is in use: -1, 0, 1 330 pthread_mutex_t _mutex[1]; 331 pthread_cond_t _cond[2]; // one for relative times and one for abs. 332 333 public: // TODO-FIXME: make dtor private 334 ~PlatformParker() { guarantee(0, "invariant"); } 335 336 public: 337 PlatformParker() { 338 int status; 339 status = pthread_cond_init(&_cond[REL_INDEX], os::Linux::condAttr()); 340 assert_status(status == 0, status, "cond_init rel"); 341 status = pthread_cond_init(&_cond[ABS_INDEX], NULL); 342 assert_status(status == 0, status, "cond_init abs"); 343 status = pthread_mutex_init(_mutex, NULL); 344 assert_status(status == 0, status, "mutex_init"); 345 _cur_index = -1; // mark as unused 346 } 347}; 348 349#endif // OS_LINUX_VM_OS_LINUX_HPP 350