os_linux.hpp revision 9433:149cc1f9f1aa
1253883Ssjg/* 2236769Sobrien * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3236769Sobrien * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4236769Sobrien * 5236769Sobrien * This code is free software; you can redistribute it and/or modify it 6236769Sobrien * under the terms of the GNU General Public License version 2 only, as 7236769Sobrien * published by the Free Software Foundation. 8236769Sobrien * 9236769Sobrien * This code is distributed in the hope that it will be useful, but WITHOUT 10236769Sobrien * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11236769Sobrien * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12236769Sobrien * version 2 for more details (a copy is included in the LICENSE file that 13236769Sobrien * accompanied this code). 14236769Sobrien * 15236769Sobrien * You should have received a copy of the GNU General Public License version 16236769Sobrien * 2 along with this work; if not, write to the Free Software Foundation, 17236769Sobrien * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18236769Sobrien * 19236769Sobrien * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20236769Sobrien * or visit www.oracle.com if you need additional information or have any 21236769Sobrien * questions. 22236769Sobrien * 23236769Sobrien */ 24236769Sobrien 25236769Sobrien#ifndef OS_LINUX_VM_OS_LINUX_HPP 26236769Sobrien#define OS_LINUX_VM_OS_LINUX_HPP 27236769Sobrien 28236769Sobrien// Linux_OS defines the interface to Linux operating systems 29236769Sobrien 30236769Sobrien// Information about the protection of the page at address '0' on this os. 31236769Sobrienstatic bool zero_page_read_protected() { return true; } 32236769Sobrien 33236769Sobrienclass Linux { 34236769Sobrien friend class os; 35236769Sobrien friend class TestReserveMemorySpecial; 36236769Sobrien 37236769Sobrien static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 38236769Sobrien // __sigaction(), signal() is loaded 39236769Sobrien static struct sigaction *(*get_signal_action)(int); 40236769Sobrien static struct sigaction *get_preinstalled_handler(int); 41236769Sobrien static void save_preinstalled_handler(int, struct sigaction&); 42236769Sobrien 43236769Sobrien static void check_signal_handler(int sig); 44236769Sobrien 45236769Sobrien static int (*_clock_gettime)(clockid_t, struct timespec *); 46236769Sobrien static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); 47236769Sobrien static int (*_pthread_setname_np)(pthread_t, const char*); 48236769Sobrien 49236769Sobrien static address _initial_thread_stack_bottom; 50236769Sobrien static uintptr_t _initial_thread_stack_size; 51236769Sobrien 52236769Sobrien static const char *_glibc_version; 53236769Sobrien static const char *_libpthread_version; 54236769Sobrien 55236769Sobrien static bool _supports_fast_thread_cpu_time; 56236769Sobrien 57236769Sobrien static GrowableArray<int>* _cpu_to_node; 58236769Sobrien 59236769Sobrien protected: 60236769Sobrien 61236769Sobrien static julong _physical_memory; 62236769Sobrien static pthread_t _main_thread; 63236769Sobrien static Mutex* _createThread_lock; 64236769Sobrien static int _page_size; 65236769Sobrien static const int _vm_default_page_size; 66236769Sobrien 67236769Sobrien static julong available_memory(); 68236769Sobrien static julong physical_memory() { return _physical_memory; } 69236769Sobrien static void initialize_system_info(); 70236769Sobrien 71236769Sobrien static int commit_memory_impl(char* addr, size_t bytes, bool exec); 72253883Ssjg static int commit_memory_impl(char* addr, size_t bytes, 73236769Sobrien size_t alignment_hint, bool exec); 74236769Sobrien 75236769Sobrien static void set_glibc_version(const char *s) { _glibc_version = s; } 76236769Sobrien static void set_libpthread_version(const char *s) { _libpthread_version = s; } 77236769Sobrien 78236769Sobrien static void rebuild_cpu_to_node_map(); 79236769Sobrien static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 80236769Sobrien 81236769Sobrien static size_t find_large_page_size(); 82236769Sobrien static size_t setup_large_page_size(); 83236769Sobrien 84253883Ssjg static bool setup_large_page_type(size_t page_size); 85236769Sobrien static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); 86236769Sobrien static bool hugetlbfs_sanity_check(bool warn, size_t page_size); 87236769Sobrien 88236769Sobrien static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); 89236769Sobrien static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); 90236769Sobrien static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); 91236769Sobrien static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); 92236769Sobrien 93236769Sobrien static bool release_memory_special_impl(char* base, size_t bytes); 94236769Sobrien static bool release_memory_special_shm(char* base, size_t bytes); 95236769Sobrien static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); 96236769Sobrien 97236769Sobrien static void print_full_memory_info(outputStream* st); 98236769Sobrien static void print_distro_info(outputStream* st); 99236769Sobrien static void print_libversion_info(outputStream* st); 100236769Sobrien 101236769Sobrien public: 102236769Sobrien static bool _stack_is_executable; 103236769Sobrien static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); 104236769Sobrien static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); 105236769Sobrien 106236769Sobrien static void init_thread_fpu_state(); 107236769Sobrien static int get_fpu_control_word(); 108236769Sobrien static void set_fpu_control_word(int fpu_control); 109236769Sobrien static pthread_t main_thread(void) { return _main_thread; } 110236769Sobrien // returns kernel thread id (similar to LWP id on Solaris), which can be 111236769Sobrien // used to access /proc 112236769Sobrien static pid_t gettid(); 113236769Sobrien static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 114236769Sobrien static Mutex* createThread_lock(void) { return _createThread_lock; } 115236769Sobrien static void hotspot_sigmask(Thread* thread); 116236769Sobrien 117236769Sobrien static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 118236769Sobrien static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 119236769Sobrien static bool is_initial_thread(void); 120236769Sobrien 121236769Sobrien static int page_size(void) { return _page_size; } 122236769Sobrien static void set_page_size(int val) { _page_size = val; } 123236769Sobrien 124236769Sobrien static int vm_default_page_size(void) { return _vm_default_page_size; } 125236769Sobrien 126253883Ssjg static address ucontext_get_pc(ucontext_t* uc); 127236769Sobrien static void ucontext_set_pc(ucontext_t* uc, address pc); 128236769Sobrien static intptr_t* ucontext_get_sp(ucontext_t* uc); 129236769Sobrien static intptr_t* ucontext_get_fp(ucontext_t* uc); 130236769Sobrien 131253883Ssjg // For Analyzer Forte AsyncGetCallTrace profiling support: 132236769Sobrien // 133236769Sobrien // This interface should be declared in os_linux_i486.hpp, but 134236769Sobrien // that file provides extensions to the os class and not the 135236769Sobrien // Linux class. 136236769Sobrien static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 137236769Sobrien intptr_t** ret_sp, intptr_t** ret_fp); 138236769Sobrien 139236769Sobrien // This boolean allows users to forward their own non-matching signals 140236769Sobrien // to JVM_handle_linux_signal, harmlessly. 141236769Sobrien static bool signal_handlers_are_installed; 142236769Sobrien 143236769Sobrien static int get_our_sigflags(int); 144236769Sobrien static void set_our_sigflags(int, int); 145236769Sobrien static void signal_sets_init(); 146236769Sobrien static void install_signal_handlers(); 147236769Sobrien static void set_signal_handler(int, bool); 148236769Sobrien static bool is_sig_ignored(int sig); 149236769Sobrien 150236769Sobrien static sigset_t* unblocked_signals(); 151236769Sobrien static sigset_t* vm_signals(); 152236769Sobrien static sigset_t* allowdebug_blocked_signals(); 153236769Sobrien 154236769Sobrien // For signal-chaining 155236769Sobrien static struct sigaction *get_chained_signal_action(int sig); 156236769Sobrien static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 157236769Sobrien 158236769Sobrien // GNU libc and libpthread version strings 159236769Sobrien static const char *glibc_version() { return _glibc_version; } 160236769Sobrien static const char *libpthread_version() { return _libpthread_version; } 161240330Smarcel 162236769Sobrien static void libpthread_init(); 163236769Sobrien static bool libnuma_init(); 164236769Sobrien static void* libnuma_dlsym(void* handle, const char* name); 165236769Sobrien // Minimum stack size a thread can be created with (allowing 166236769Sobrien // the VM to completely create the thread and enter user code) 167253883Ssjg static size_t min_stack_allowed; 168236769Sobrien 169236769Sobrien // Return default stack size or guard size for the specified thread type 170236769Sobrien static size_t default_stack_size(os::ThreadType thr_type); 171236769Sobrien static size_t default_guard_size(os::ThreadType thr_type); 172236769Sobrien 173236769Sobrien static void capture_initial_stack(size_t max_size); 174236769Sobrien 175236769Sobrien // Stack overflow handling 176236769Sobrien static bool manually_expand_stack(JavaThread * t, address addr); 177236769Sobrien static int max_register_window_saves_before_flushing(); 178236769Sobrien 179236769Sobrien // Real-time clock functions 180236769Sobrien static void clock_init(void); 181237578Sobrien 182236769Sobrien // fast POSIX clocks support 183236769Sobrien static void fast_thread_clock_init(void); 184236769Sobrien 185236769Sobrien static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 186236769Sobrien return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 187236769Sobrien } 188236769Sobrien 189253883Ssjg static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { 190236769Sobrien return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; 191236769Sobrien } 192236769Sobrien 193236769Sobrien static bool supports_fast_thread_cpu_time() { 194236769Sobrien return _supports_fast_thread_cpu_time; 195236769Sobrien } 196236769Sobrien 197236769Sobrien static jlong fast_thread_cpu_time(clockid_t clockid); 198236769Sobrien 199236769Sobrien // pthread_cond clock suppport 200236769Sobrien private: 201236769Sobrien static pthread_condattr_t _condattr[1]; 202236769Sobrien 203236769Sobrien public: 204253883Ssjg static pthread_condattr_t* condAttr() { return _condattr; } 205253883Ssjg 206253883Ssjg // Stack repair handling 207253883Ssjg 208253883Ssjg // none present 209253883Ssjg 210253883Ssjg private: 211253883Ssjg typedef int (*sched_getcpu_func_t)(void); 212253883Ssjg typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 213253883Ssjg typedef int (*numa_max_node_func_t)(void); 214253883Ssjg typedef int (*numa_available_func_t)(void); 215253883Ssjg typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 216253883Ssjg typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 217253883Ssjg typedef void (*numa_set_bind_policy_func_t)(int policy); 218253883Ssjg 219253883Ssjg static sched_getcpu_func_t _sched_getcpu; 220253883Ssjg static numa_node_to_cpus_func_t _numa_node_to_cpus; 221253883Ssjg static numa_max_node_func_t _numa_max_node; 222253883Ssjg static numa_available_func_t _numa_available; 223253883Ssjg static numa_tonode_memory_func_t _numa_tonode_memory; 224253883Ssjg static numa_interleave_memory_func_t _numa_interleave_memory; 225253883Ssjg static numa_set_bind_policy_func_t _numa_set_bind_policy; 226253883Ssjg static unsigned long* _numa_all_nodes; 227253883Ssjg 228253883Ssjg static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 229253883Ssjg static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 230253883Ssjg static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 231253883Ssjg static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 232253883Ssjg static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 233253883Ssjg static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 234253883Ssjg static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; } 235253883Ssjg static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 236236769Sobrien static int sched_getcpu_syscall(void); 237236769Sobrien public: 238236769Sobrien static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 239236769Sobrien static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 240236769Sobrien return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 241236769Sobrien } 242236769Sobrien static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 243236769Sobrien static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 244236769Sobrien static int numa_tonode_memory(void *start, size_t size, int node) { 245236769Sobrien return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 246236769Sobrien } 247236769Sobrien static void numa_interleave_memory(void *start, size_t size) { 248236769Sobrien if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 249236769Sobrien _numa_interleave_memory(start, size, _numa_all_nodes); 250236769Sobrien } 251236769Sobrien } 252236769Sobrien static void numa_set_bind_policy(int policy) { 253236769Sobrien if (_numa_set_bind_policy != NULL) { 254236769Sobrien _numa_set_bind_policy(policy); 255236769Sobrien } 256236769Sobrien } 257236769Sobrien static int get_node_by_cpu(int cpu_id); 258236769Sobrien}; 259236769Sobrien 260236769Sobrien 261236769Sobrienclass PlatformEvent : public CHeapObj<mtInternal> { 262236769Sobrien private: 263236769Sobrien double CachePad[4]; // increase odds that _mutex is sole occupant of cache line 264236769Sobrien volatile int _Event; 265236769Sobrien volatile int _nParked; 266236769Sobrien pthread_mutex_t _mutex[1]; 267236769Sobrien pthread_cond_t _cond[1]; 268236769Sobrien double PostPad[2]; 269236769Sobrien Thread * _Assoc; 270236769Sobrien 271236769Sobrien public: // TODO-FIXME: make dtor private 272236769Sobrien ~PlatformEvent() { guarantee(0, "invariant"); } 273236769Sobrien 274236769Sobrien public: 275236769Sobrien PlatformEvent() { 276236769Sobrien int status; 277236769Sobrien status = pthread_cond_init(_cond, os::Linux::condAttr()); 278236769Sobrien assert_status(status == 0, status, "cond_init"); 279236769Sobrien status = pthread_mutex_init(_mutex, NULL); 280236769Sobrien assert_status(status == 0, status, "mutex_init"); 281236769Sobrien _Event = 0; 282236769Sobrien _nParked = 0; 283236769Sobrien _Assoc = NULL; 284236769Sobrien } 285236769Sobrien 286236769Sobrien // Use caution with reset() and fired() -- they may require MEMBARs 287236769Sobrien void reset() { _Event = 0; } 288236769Sobrien int fired() { return _Event; } 289236769Sobrien void park(); 290236769Sobrien void unpark(); 291236769Sobrien int park(jlong millis); // relative timed-wait only 292236769Sobrien void SetAssociation(Thread * a) { _Assoc = a; } 293236769Sobrien}; 294236769Sobrien 295236769Sobrienclass PlatformParker : public CHeapObj<mtInternal> { 296236769Sobrien protected: 297236769Sobrien enum { 298236769Sobrien REL_INDEX = 0, 299236769Sobrien ABS_INDEX = 1 300236769Sobrien }; 301236769Sobrien int _cur_index; // which cond is in use: -1, 0, 1 302236769Sobrien pthread_mutex_t _mutex[1]; 303236769Sobrien pthread_cond_t _cond[2]; // one for relative times and one for abs. 304236769Sobrien 305240330Smarcel public: // TODO-FIXME: make dtor private 306240330Smarcel ~PlatformParker() { guarantee(0, "invariant"); } 307240330Smarcel 308236769Sobrien public: 309236769Sobrien PlatformParker() { 310236769Sobrien int status; 311236769Sobrien status = pthread_cond_init(&_cond[REL_INDEX], os::Linux::condAttr()); 312236769Sobrien assert_status(status == 0, status, "cond_init rel"); 313236769Sobrien status = pthread_cond_init(&_cond[ABS_INDEX], NULL); 314236769Sobrien assert_status(status == 0, status, "cond_init abs"); 315236769Sobrien status = pthread_mutex_init(_mutex, NULL); 316236769Sobrien assert_status(status == 0, status, "mutex_init"); 317236769Sobrien _cur_index = -1; // mark as unused 318236769Sobrien } 319236769Sobrien}; 320236769Sobrien 321236769Sobrien#endif // OS_LINUX_VM_OS_LINUX_HPP 322236769Sobrien