| /* |
| * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef OS_LINUX_VM_OS_LINUX_HPP |
| #define OS_LINUX_VM_OS_LINUX_HPP |
| |
| // Linux_OS defines the interface to Linux operating systems |
| |
| /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */ |
| typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); |
| |
| class Linux { |
| friend class os; |
| friend class TestReserveMemorySpecial; |
| |
| // For signal-chaining |
| #define MAXSIGNUM 32 |
| static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions |
| static unsigned int sigs; // mask of signals that have |
| // preinstalled signal handlers |
| static bool libjsig_is_loaded; // libjsig that interposes sigaction(), |
| // __sigaction(), signal() is loaded |
| static struct sigaction *(*get_signal_action)(int); |
| static struct sigaction *get_preinstalled_handler(int); |
| static void save_preinstalled_handler(int, struct sigaction&); |
| |
| static void check_signal_handler(int sig); |
| |
| // For signal flags diagnostics |
| static int sigflags[MAXSIGNUM]; |
| |
| static int (*_clock_gettime)(clockid_t, struct timespec *); |
| static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); |
| |
| static address _initial_thread_stack_bottom; |
| static uintptr_t _initial_thread_stack_size; |
| |
| static const char *_glibc_version; |
| static const char *_libpthread_version; |
| |
| static bool _is_floating_stack; |
| static bool _is_NPTL; |
| static bool _supports_fast_thread_cpu_time; |
| |
| static GrowableArray<int>* _cpu_to_node; |
| |
| protected: |
| |
| static julong _physical_memory; |
| static pthread_t _main_thread; |
| static Mutex* _createThread_lock; |
| static int _page_size; |
| static const int _vm_default_page_size; |
| |
| static julong available_memory(); |
| static julong physical_memory() { return _physical_memory; } |
| static void initialize_system_info(); |
| |
| static int commit_memory_impl(char* addr, size_t bytes, bool exec); |
| static int commit_memory_impl(char* addr, size_t bytes, |
| size_t alignment_hint, bool exec); |
| |
| static void set_glibc_version(const char *s) { _glibc_version = s; } |
| static void set_libpthread_version(const char *s) { _libpthread_version = s; } |
| |
| static bool supports_variable_stack_size(); |
| |
| static void set_is_NPTL() { _is_NPTL = true; } |
| static void set_is_LinuxThreads() { _is_NPTL = false; } |
| static void set_is_floating_stack() { _is_floating_stack = true; } |
| |
| static void rebuild_cpu_to_node_map(); |
| static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } |
| |
| static size_t find_large_page_size(); |
| static size_t setup_large_page_size(); |
| |
| static bool setup_large_page_type(size_t page_size); |
| static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size); |
| static bool hugetlbfs_sanity_check(bool warn, size_t page_size); |
| |
| static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec); |
| static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec); |
| static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec); |
| static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec); |
| |
| static bool release_memory_special_shm(char* base, size_t bytes); |
| static bool release_memory_special_huge_tlbfs(char* base, size_t bytes); |
| |
| static void print_full_memory_info(outputStream* st); |
| static void print_distro_info(outputStream* st); |
| static void print_libversion_info(outputStream* st); |
| |
| public: |
| static bool _stack_is_executable; |
| static void *dlopen_helper(const char *name, char *ebuf, int ebuflen); |
| static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen); |
| |
| static void init_thread_fpu_state(); |
| static int get_fpu_control_word(); |
| static void set_fpu_control_word(int fpu_control); |
| static pthread_t main_thread(void) { return _main_thread; } |
| // returns kernel thread id (similar to LWP id on Solaris), which can be |
| // used to access /proc |
| static pid_t gettid(); |
| static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } |
| static Mutex* createThread_lock(void) { return _createThread_lock; } |
| static void hotspot_sigmask(Thread* thread); |
| |
| static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } |
| static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } |
| static bool is_initial_thread(void); |
| |
| static int page_size(void) { return _page_size; } |
| static void set_page_size(int val) { _page_size = val; } |
| |
| static int vm_default_page_size(void) { return _vm_default_page_size; } |
| |
| static address ucontext_get_pc(ucontext_t* uc); |
| static intptr_t* ucontext_get_sp(ucontext_t* uc); |
| static intptr_t* ucontext_get_fp(ucontext_t* uc); |
| |
| // For Analyzer Forte AsyncGetCallTrace profiling support: |
| // |
| // This interface should be declared in os_linux_i486.hpp, but |
| // that file provides extensions to the os class and not the |
| // Linux class. |
| static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, |
| intptr_t** ret_sp, intptr_t** ret_fp); |
| |
| // This boolean allows users to forward their own non-matching signals |
| // to JVM_handle_linux_signal, harmlessly. |
| static bool signal_handlers_are_installed; |
| |
| static int get_our_sigflags(int); |
| static void set_our_sigflags(int, int); |
| static void signal_sets_init(); |
| static void install_signal_handlers(); |
| static void set_signal_handler(int, bool); |
| static bool is_sig_ignored(int sig); |
| |
| static sigset_t* unblocked_signals(); |
| static sigset_t* vm_signals(); |
| static sigset_t* allowdebug_blocked_signals(); |
| |
| // For signal-chaining |
| static struct sigaction *get_chained_signal_action(int sig); |
| static bool chained_handler(int sig, siginfo_t* siginfo, void* context); |
| |
| // GNU libc and libpthread version strings |
| static const char *glibc_version() { return _glibc_version; } |
| static const char *libpthread_version() { return _libpthread_version; } |
| |
| // NPTL or LinuxThreads? |
| static bool is_LinuxThreads() { return !_is_NPTL; } |
| static bool is_NPTL() { return _is_NPTL; } |
| |
| // NPTL is always floating stack. LinuxThreads could be using floating |
| // stack or fixed stack. |
| static bool is_floating_stack() { return _is_floating_stack; } |
| |
| static void libpthread_init(); |
| static bool libnuma_init(); |
| static void* libnuma_dlsym(void* handle, const char* name); |
| // Minimum stack size a thread can be created with (allowing |
| // the VM to completely create the thread and enter user code) |
| static size_t min_stack_allowed; |
| |
| // Return default stack size or guard size for the specified thread type |
| static size_t default_stack_size(os::ThreadType thr_type); |
| static size_t default_guard_size(os::ThreadType thr_type); |
| |
| static void capture_initial_stack(size_t max_size); |
| |
| // Stack overflow handling |
| static bool manually_expand_stack(JavaThread * t, address addr); |
| static int max_register_window_saves_before_flushing(); |
| |
| // Real-time clock functions |
| static void clock_init(void); |
| |
| // fast POSIX clocks support |
| static void fast_thread_clock_init(void); |
| |
| static inline bool supports_monotonic_clock() { |
| return _clock_gettime != NULL; |
| } |
| |
| static int clock_gettime(clockid_t clock_id, struct timespec *tp) { |
| return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; |
| } |
| |
| static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { |
| return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; |
| } |
| |
| static bool supports_fast_thread_cpu_time() { |
| return _supports_fast_thread_cpu_time; |
| } |
| |
| static jlong fast_thread_cpu_time(clockid_t clockid); |
| |
| // pthread_cond clock suppport |
| private: |
| static pthread_condattr_t _condattr[1]; |
| |
| public: |
| static pthread_condattr_t* condAttr() { return _condattr; } |
| |
| // Stack repair handling |
| |
| // none present |
| |
| // LinuxThreads work-around for 6292965 |
| static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); |
| |
| private: |
| typedef int (*sched_getcpu_func_t)(void); |
| typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); |
| typedef int (*numa_max_node_func_t)(void); |
| typedef int (*numa_available_func_t)(void); |
| typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); |
| typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); |
| typedef void (*numa_set_bind_policy_func_t)(int policy); |
| |
| static sched_getcpu_func_t _sched_getcpu; |
| static numa_node_to_cpus_func_t _numa_node_to_cpus; |
| static numa_max_node_func_t _numa_max_node; |
| static numa_available_func_t _numa_available; |
| static numa_tonode_memory_func_t _numa_tonode_memory; |
| static numa_interleave_memory_func_t _numa_interleave_memory; |
| static numa_set_bind_policy_func_t _numa_set_bind_policy; |
| static unsigned long* _numa_all_nodes; |
| |
| static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } |
| static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } |
| static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } |
| static void set_numa_available(numa_available_func_t func) { _numa_available = func; } |
| static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } |
| static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } |
| static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; } |
| static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } |
| static int sched_getcpu_syscall(void); |
| public: |
| static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } |
| static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { |
| return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; |
| } |
| static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } |
| static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } |
| static int numa_tonode_memory(void *start, size_t size, int node) { |
| return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; |
| } |
| static void numa_interleave_memory(void *start, size_t size) { |
| if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { |
| _numa_interleave_memory(start, size, _numa_all_nodes); |
| } |
| } |
| static void numa_set_bind_policy(int policy) { |
| if (_numa_set_bind_policy != NULL) { |
| _numa_set_bind_policy(policy); |
| } |
| } |
| static int get_node_by_cpu(int cpu_id); |
| }; |
| |
| |
| class PlatformEvent : public CHeapObj<mtInternal> { |
| private: |
| double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line |
| volatile int _Event ; |
| volatile int _nParked ; |
| pthread_mutex_t _mutex [1] ; |
| pthread_cond_t _cond [1] ; |
| double PostPad [2] ; |
| Thread * _Assoc ; |
| |
| public: // TODO-FIXME: make dtor private |
| ~PlatformEvent() { guarantee (0, "invariant") ; } |
| |
| public: |
| PlatformEvent() { |
| int status; |
| status = pthread_cond_init (_cond, os::Linux::condAttr()); |
| assert_status(status == 0, status, "cond_init"); |
| status = pthread_mutex_init (_mutex, NULL); |
| assert_status(status == 0, status, "mutex_init"); |
| _Event = 0 ; |
| _nParked = 0 ; |
| _Assoc = NULL ; |
| } |
| |
| // Use caution with reset() and fired() -- they may require MEMBARs |
| void reset() { _Event = 0 ; } |
| int fired() { return _Event; } |
| void park () ; |
| void unpark () ; |
| int TryPark () ; |
| int park (jlong millis) ; // relative timed-wait only |
| void SetAssociation (Thread * a) { _Assoc = a ; } |
| } ; |
| |
| class PlatformParker : public CHeapObj<mtInternal> { |
| protected: |
| enum { |
| REL_INDEX = 0, |
| ABS_INDEX = 1 |
| }; |
| int _cur_index; // which cond is in use: -1, 0, 1 |
| pthread_mutex_t _mutex [1] ; |
| pthread_cond_t _cond [2] ; // one for relative times and one for abs. |
| |
| public: // TODO-FIXME: make dtor private |
| ~PlatformParker() { guarantee (0, "invariant") ; } |
| |
| public: |
| PlatformParker() { |
| int status; |
| status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr()); |
| assert_status(status == 0, status, "cond_init rel"); |
| status = pthread_cond_init (&_cond[ABS_INDEX], NULL); |
| assert_status(status == 0, status, "cond_init abs"); |
| status = pthread_mutex_init (_mutex, NULL); |
| assert_status(status == 0, status, "mutex_init"); |
| _cur_index = -1; // mark as unused |
| } |
| }; |
| |
| #endif // OS_LINUX_VM_OS_LINUX_HPP |