1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os/linux/vm/os_linux.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,353 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef OS_LINUX_VM_OS_LINUX_HPP
1.29 +#define OS_LINUX_VM_OS_LINUX_HPP
1.30 +
1.31 +// Linux_OS defines the interface to Linux operating systems
1.32 +
1.33 +/* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
1.34 +typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
1.35 +
1.36 +// Information about the protection of the page at address '0' on this os.
1.37 +static bool zero_page_read_protected() { return true; }
1.38 +
1.39 +class Linux {
1.40 + friend class os;
1.41 + friend class TestReserveMemorySpecial;
1.42 +
1.43 + // For signal-chaining
1.44 +#define MAXSIGNUM 32
1.45 + static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
1.46 + static unsigned int sigs; // mask of signals that have
1.47 + // preinstalled signal handlers
1.48 + static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
1.49 + // __sigaction(), signal() is loaded
1.50 + static struct sigaction *(*get_signal_action)(int);
1.51 + static struct sigaction *get_preinstalled_handler(int);
1.52 + static void save_preinstalled_handler(int, struct sigaction&);
1.53 +
1.54 + static void check_signal_handler(int sig);
1.55 +
1.56 + // For signal flags diagnostics
1.57 + static int sigflags[MAXSIGNUM];
1.58 +
1.59 + static int (*_clock_gettime)(clockid_t, struct timespec *);
1.60 + static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
1.61 +
1.62 + static address _initial_thread_stack_bottom;
1.63 + static uintptr_t _initial_thread_stack_size;
1.64 +
1.65 + static const char *_glibc_version;
1.66 + static const char *_libpthread_version;
1.67 +
1.68 + static bool _is_floating_stack;
1.69 + static bool _is_NPTL;
1.70 + static bool _supports_fast_thread_cpu_time;
1.71 +
1.72 + static GrowableArray<int>* _cpu_to_node;
1.73 +
1.74 + protected:
1.75 +
1.76 + static julong _physical_memory;
1.77 + static pthread_t _main_thread;
1.78 + static Mutex* _createThread_lock;
1.79 + static int _page_size;
1.80 + static const int _vm_default_page_size;
1.81 +
1.82 + static julong available_memory();
1.83 + static julong physical_memory() { return _physical_memory; }
1.84 + static void initialize_system_info();
1.85 +
1.86 + static int commit_memory_impl(char* addr, size_t bytes, bool exec);
1.87 + static int commit_memory_impl(char* addr, size_t bytes,
1.88 + size_t alignment_hint, bool exec);
1.89 +
1.90 + static void set_glibc_version(const char *s) { _glibc_version = s; }
1.91 + static void set_libpthread_version(const char *s) { _libpthread_version = s; }
1.92 +
1.93 + static bool supports_variable_stack_size();
1.94 +
1.95 + static void set_is_NPTL() { _is_NPTL = true; }
1.96 + static void set_is_LinuxThreads() { _is_NPTL = false; }
1.97 + static void set_is_floating_stack() { _is_floating_stack = true; }
1.98 +
1.99 + static void rebuild_cpu_to_node_map();
1.100 + static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
1.101 +
1.102 + static size_t find_large_page_size();
1.103 + static size_t setup_large_page_size();
1.104 +
1.105 + static bool setup_large_page_type(size_t page_size);
1.106 + static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size);
1.107 + static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
1.108 +
1.109 + static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec);
1.110 + static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec);
1.111 + static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec);
1.112 + static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec);
1.113 +
1.114 + static bool release_memory_special_shm(char* base, size_t bytes);
1.115 + static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
1.116 +
1.117 + static void print_full_memory_info(outputStream* st);
1.118 + static void print_distro_info(outputStream* st);
1.119 + static void print_libversion_info(outputStream* st);
1.120 +
1.121 + public:
1.122 + static bool _stack_is_executable;
1.123 + static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
1.124 + static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
1.125 +
1.126 + static void init_thread_fpu_state();
1.127 + static int get_fpu_control_word();
1.128 + static void set_fpu_control_word(int fpu_control);
1.129 + static pthread_t main_thread(void) { return _main_thread; }
1.130 + // returns kernel thread id (similar to LWP id on Solaris), which can be
1.131 + // used to access /proc
1.132 + static pid_t gettid();
1.133 + static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
1.134 + static Mutex* createThread_lock(void) { return _createThread_lock; }
1.135 + static void hotspot_sigmask(Thread* thread);
1.136 +
1.137 + static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
1.138 + static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
1.139 + static bool is_initial_thread(void);
1.140 +
1.141 + static int page_size(void) { return _page_size; }
1.142 + static void set_page_size(int val) { _page_size = val; }
1.143 +
1.144 + static int vm_default_page_size(void) { return _vm_default_page_size; }
1.145 +
1.146 + static address ucontext_get_pc(ucontext_t* uc);
1.147 + static intptr_t* ucontext_get_sp(ucontext_t* uc);
1.148 + static intptr_t* ucontext_get_fp(ucontext_t* uc);
1.149 +
1.150 + // For Analyzer Forte AsyncGetCallTrace profiling support:
1.151 + //
1.152 + // This interface should be declared in os_linux_i486.hpp, but
1.153 + // that file provides extensions to the os class and not the
1.154 + // Linux class.
1.155 + static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
1.156 + intptr_t** ret_sp, intptr_t** ret_fp);
1.157 +
1.158 + // This boolean allows users to forward their own non-matching signals
1.159 + // to JVM_handle_linux_signal, harmlessly.
1.160 + static bool signal_handlers_are_installed;
1.161 +
1.162 + static int get_our_sigflags(int);
1.163 + static void set_our_sigflags(int, int);
1.164 + static void signal_sets_init();
1.165 + static void install_signal_handlers();
1.166 + static void set_signal_handler(int, bool);
1.167 + static bool is_sig_ignored(int sig);
1.168 +
1.169 + static sigset_t* unblocked_signals();
1.170 + static sigset_t* vm_signals();
1.171 + static sigset_t* allowdebug_blocked_signals();
1.172 +
1.173 + // For signal-chaining
1.174 + static struct sigaction *get_chained_signal_action(int sig);
1.175 + static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
1.176 +
1.177 + // GNU libc and libpthread version strings
1.178 + static const char *glibc_version() { return _glibc_version; }
1.179 + static const char *libpthread_version() { return _libpthread_version; }
1.180 +
1.181 + // NPTL or LinuxThreads?
1.182 + static bool is_LinuxThreads() { return !_is_NPTL; }
1.183 + static bool is_NPTL() { return _is_NPTL; }
1.184 +
1.185 + // NPTL is always floating stack. LinuxThreads could be using floating
1.186 + // stack or fixed stack.
1.187 + static bool is_floating_stack() { return _is_floating_stack; }
1.188 +
1.189 + static void libpthread_init();
1.190 + static bool libnuma_init();
1.191 + static void* libnuma_dlsym(void* handle, const char* name);
1.192 + // Minimum stack size a thread can be created with (allowing
1.193 + // the VM to completely create the thread and enter user code)
1.194 + static size_t min_stack_allowed;
1.195 +
1.196 + // Return default stack size or guard size for the specified thread type
1.197 + static size_t default_stack_size(os::ThreadType thr_type);
1.198 + static size_t default_guard_size(os::ThreadType thr_type);
1.199 +
1.200 + static void capture_initial_stack(size_t max_size);
1.201 +
1.202 + // Stack overflow handling
1.203 + static bool manually_expand_stack(JavaThread * t, address addr);
1.204 + static int max_register_window_saves_before_flushing();
1.205 +
1.206 + // Real-time clock functions
1.207 + static void clock_init(void);
1.208 +
1.209 + // fast POSIX clocks support
1.210 + static void fast_thread_clock_init(void);
1.211 +
1.212 + static inline bool supports_monotonic_clock() {
1.213 + return _clock_gettime != NULL;
1.214 + }
1.215 +
1.216 + static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
1.217 + return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
1.218 + }
1.219 +
1.220 + static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
1.221 + return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
1.222 + }
1.223 +
1.224 + static bool supports_fast_thread_cpu_time() {
1.225 + return _supports_fast_thread_cpu_time;
1.226 + }
1.227 +
1.228 + static jlong fast_thread_cpu_time(clockid_t clockid);
1.229 +
1.230 + // pthread_cond clock suppport
1.231 + private:
1.232 + static pthread_condattr_t _condattr[1];
1.233 +
1.234 + public:
1.235 + static pthread_condattr_t* condAttr() { return _condattr; }
1.236 +
1.237 + // Stack repair handling
1.238 +
1.239 + // none present
1.240 +
1.241 + // LinuxThreads work-around for 6292965
1.242 + static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
1.243 +
1.244 +private:
1.245 + typedef int (*sched_getcpu_func_t)(void);
1.246 + typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
1.247 + typedef int (*numa_max_node_func_t)(void);
1.248 + typedef int (*numa_available_func_t)(void);
1.249 + typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
1.250 + typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
1.251 + typedef void (*numa_set_bind_policy_func_t)(int policy);
1.252 +
1.253 + static sched_getcpu_func_t _sched_getcpu;
1.254 + static numa_node_to_cpus_func_t _numa_node_to_cpus;
1.255 + static numa_max_node_func_t _numa_max_node;
1.256 + static numa_available_func_t _numa_available;
1.257 + static numa_tonode_memory_func_t _numa_tonode_memory;
1.258 + static numa_interleave_memory_func_t _numa_interleave_memory;
1.259 + static numa_set_bind_policy_func_t _numa_set_bind_policy;
1.260 + static unsigned long* _numa_all_nodes;
1.261 +
1.262 + static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
1.263 + static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
1.264 + static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
1.265 + static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
1.266 + static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
1.267 + static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
1.268 + static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; }
1.269 + static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
1.270 + static int sched_getcpu_syscall(void);
1.271 +public:
1.272 + static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
1.273 + static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
1.274 + return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
1.275 + }
1.276 + static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
1.277 + static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
1.278 + static int numa_tonode_memory(void *start, size_t size, int node) {
1.279 + return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
1.280 + }
1.281 + static void numa_interleave_memory(void *start, size_t size) {
1.282 + if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
1.283 + _numa_interleave_memory(start, size, _numa_all_nodes);
1.284 + }
1.285 + }
1.286 + static void numa_set_bind_policy(int policy) {
1.287 + if (_numa_set_bind_policy != NULL) {
1.288 + _numa_set_bind_policy(policy);
1.289 + }
1.290 + }
1.291 + static int get_node_by_cpu(int cpu_id);
1.292 +};
1.293 +
1.294 +
1.295 +class PlatformEvent : public CHeapObj<mtInternal> {
1.296 + private:
1.297 + double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
1.298 + volatile int _Event ;
1.299 + volatile int _nParked ;
1.300 + pthread_mutex_t _mutex [1] ;
1.301 + pthread_cond_t _cond [1] ;
1.302 + double PostPad [2] ;
1.303 + Thread * _Assoc ;
1.304 +
1.305 + public: // TODO-FIXME: make dtor private
1.306 + ~PlatformEvent() { guarantee (0, "invariant") ; }
1.307 +
1.308 + public:
1.309 + PlatformEvent() {
1.310 + int status;
1.311 + status = pthread_cond_init (_cond, os::Linux::condAttr());
1.312 + assert_status(status == 0, status, "cond_init");
1.313 + status = pthread_mutex_init (_mutex, NULL);
1.314 + assert_status(status == 0, status, "mutex_init");
1.315 + _Event = 0 ;
1.316 + _nParked = 0 ;
1.317 + _Assoc = NULL ;
1.318 + }
1.319 +
1.320 + // Use caution with reset() and fired() -- they may require MEMBARs
1.321 + void reset() { _Event = 0 ; }
1.322 + int fired() { return _Event; }
1.323 + void park () ;
1.324 + void unpark () ;
1.325 + int TryPark () ;
1.326 + int park (jlong millis) ; // relative timed-wait only
1.327 + void SetAssociation (Thread * a) { _Assoc = a ; }
1.328 +} ;
1.329 +
1.330 +class PlatformParker : public CHeapObj<mtInternal> {
1.331 + protected:
1.332 + enum {
1.333 + REL_INDEX = 0,
1.334 + ABS_INDEX = 1
1.335 + };
1.336 + int _cur_index; // which cond is in use: -1, 0, 1
1.337 + pthread_mutex_t _mutex [1] ;
1.338 + pthread_cond_t _cond [2] ; // one for relative times and one for abs.
1.339 +
1.340 + public: // TODO-FIXME: make dtor private
1.341 + ~PlatformParker() { guarantee (0, "invariant") ; }
1.342 +
1.343 + public:
1.344 + PlatformParker() {
1.345 + int status;
1.346 + status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr());
1.347 + assert_status(status == 0, status, "cond_init rel");
1.348 + status = pthread_cond_init (&_cond[ABS_INDEX], NULL);
1.349 + assert_status(status == 0, status, "cond_init abs");
1.350 + status = pthread_mutex_init (_mutex, NULL);
1.351 + assert_status(status == 0, status, "mutex_init");
1.352 + _cur_index = -1; // mark as unused
1.353 + }
1.354 +};
1.355 +
1.356 +#endif // OS_LINUX_VM_OS_LINUX_HPP
