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comparison: src/os/linux/vm/os_linux.hpp

src/os/linux/vm/os_linux.hpp

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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 // Information about the protection of the page at address '0' on this os.
34 static bool zero_page_read_protected() { return true; }
35
36 class 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_shm(char* base, size_t bytes);
112 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
113
114 static void print_full_memory_info(outputStream* st);
115 static void print_distro_info(outputStream* st);
116 static void print_libversion_info(outputStream* st);
117
118 public:
119 static bool _stack_is_executable;
120 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
121 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
122
123 static void init_thread_fpu_state();
124 static int get_fpu_control_word();
125 static void set_fpu_control_word(int fpu_control);
126 static pthread_t main_thread(void) { return _main_thread; }
127 // returns kernel thread id (similar to LWP id on Solaris), which can be
128 // used to access /proc
129 static pid_t gettid();
130 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
131 static Mutex* createThread_lock(void) { return _createThread_lock; }
132 static void hotspot_sigmask(Thread* thread);
133
134 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
135 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
136 static bool is_initial_thread(void);
137
138 static int page_size(void) { return _page_size; }
139 static void set_page_size(int val) { _page_size = val; }
140
141 static int vm_default_page_size(void) { return _vm_default_page_size; }
142
143 static address ucontext_get_pc(ucontext_t* uc);
144 static intptr_t* ucontext_get_sp(ucontext_t* uc);
145 static intptr_t* ucontext_get_fp(ucontext_t* uc);
146
147 // For Analyzer Forte AsyncGetCallTrace profiling support:
148 //
149 // This interface should be declared in os_linux_i486.hpp, but
150 // that file provides extensions to the os class and not the
151 // Linux class.
152 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
153 intptr_t** ret_sp, intptr_t** ret_fp);
154
155 // This boolean allows users to forward their own non-matching signals
156 // to JVM_handle_linux_signal, harmlessly.
157 static bool signal_handlers_are_installed;
158
159 static int get_our_sigflags(int);
160 static void set_our_sigflags(int, int);
161 static void signal_sets_init();
162 static void install_signal_handlers();
163 static void set_signal_handler(int, bool);
164 static bool is_sig_ignored(int sig);
165
166 static sigset_t* unblocked_signals();
167 static sigset_t* vm_signals();
168 static sigset_t* allowdebug_blocked_signals();
169
170 // For signal-chaining
171 static struct sigaction *get_chained_signal_action(int sig);
172 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
173
174 // GNU libc and libpthread version strings
175 static const char *glibc_version() { return _glibc_version; }
176 static const char *libpthread_version() { return _libpthread_version; }
177
178 // NPTL or LinuxThreads?
179 static bool is_LinuxThreads() { return !_is_NPTL; }
180 static bool is_NPTL() { return _is_NPTL; }
181
182 // NPTL is always floating stack. LinuxThreads could be using floating
183 // stack or fixed stack.
184 static bool is_floating_stack() { return _is_floating_stack; }
185
186 static void libpthread_init();
187 static bool libnuma_init();
188 static void* libnuma_dlsym(void* handle, const char* name);
189 // Minimum stack size a thread can be created with (allowing
190 // the VM to completely create the thread and enter user code)
191 static size_t min_stack_allowed;
192
193 // Return default stack size or guard size for the specified thread type
194 static size_t default_stack_size(os::ThreadType thr_type);
195 static size_t default_guard_size(os::ThreadType thr_type);
196
197 static void capture_initial_stack(size_t max_size);
198
199 // Stack overflow handling
200 static bool manually_expand_stack(JavaThread * t, address addr);
201 static int max_register_window_saves_before_flushing();
202
203 // Real-time clock functions
204 static void clock_init(void);
205
206 // fast POSIX clocks support
207 static void fast_thread_clock_init(void);
208
209 static inline bool supports_monotonic_clock() {
210 return _clock_gettime != NULL;
211 }
212
213 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
214 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
215 }
216
217 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
218 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
219 }
220
221 static bool supports_fast_thread_cpu_time() {
222 return _supports_fast_thread_cpu_time;
223 }
224
225 static jlong fast_thread_cpu_time(clockid_t clockid);
226
227 // pthread_cond clock suppport
228 private:
229 static pthread_condattr_t _condattr[1];
230
231 public:
232 static pthread_condattr_t* condAttr() { return _condattr; }
233
234 // Stack repair handling
235
236 // none present
237
238 // LinuxThreads work-around for 6292965
239 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
240
241 private:
242 typedef int (*sched_getcpu_func_t)(void);
243 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
244 typedef int (*numa_max_node_func_t)(void);
245 typedef int (*numa_available_func_t)(void);
246 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
247 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
248 typedef void (*numa_set_bind_policy_func_t)(int policy);
249
250 static sched_getcpu_func_t _sched_getcpu;
251 static numa_node_to_cpus_func_t _numa_node_to_cpus;
252 static numa_max_node_func_t _numa_max_node;
253 static numa_available_func_t _numa_available;
254 static numa_tonode_memory_func_t _numa_tonode_memory;
255 static numa_interleave_memory_func_t _numa_interleave_memory;
256 static numa_set_bind_policy_func_t _numa_set_bind_policy;
257 static unsigned long* _numa_all_nodes;
258
259 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
260 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
261 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
262 static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
263 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
264 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
265 static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; }
266 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
267 static int sched_getcpu_syscall(void);
268 public:
269 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
270 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
271 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
272 }
273 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
274 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
275 static int numa_tonode_memory(void *start, size_t size, int node) {
276 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
277 }
278 static void numa_interleave_memory(void *start, size_t size) {
279 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
280 _numa_interleave_memory(start, size, _numa_all_nodes);
281 }
282 }
283 static void numa_set_bind_policy(int policy) {
284 if (_numa_set_bind_policy != NULL) {
285 _numa_set_bind_policy(policy);
286 }
287 }
288 static int get_node_by_cpu(int cpu_id);
289 };
290
291
292 class PlatformEvent : public CHeapObj<mtInternal> {
293 private:
294 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
295 volatile int _Event ;
296 volatile int _nParked ;
297 pthread_mutex_t _mutex [1] ;
298 pthread_cond_t _cond [1] ;
299 double PostPad [2] ;
300 Thread * _Assoc ;
301
302 public: // TODO-FIXME: make dtor private
303 ~PlatformEvent() { guarantee (0, "invariant") ; }
304
305 public:
306 PlatformEvent() {
307 int status;
308 status = pthread_cond_init (_cond, os::Linux::condAttr());
309 assert_status(status == 0, status, "cond_init");
310 status = pthread_mutex_init (_mutex, NULL);
311 assert_status(status == 0, status, "mutex_init");
312 _Event = 0 ;
313 _nParked = 0 ;
314 _Assoc = NULL ;
315 }
316
317 // Use caution with reset() and fired() -- they may require MEMBARs
318 void reset() { _Event = 0 ; }
319 int fired() { return _Event; }
320 void park () ;
321 void unpark () ;
322 int TryPark () ;
323 int park (jlong millis) ; // relative timed-wait only
324 void SetAssociation (Thread * a) { _Assoc = a ; }
325 } ;
326
327 class PlatformParker : public CHeapObj<mtInternal> {
328 protected:
329 enum {
330 REL_INDEX = 0,
331 ABS_INDEX = 1
332 };
333 int _cur_index; // which cond is in use: -1, 0, 1
334 pthread_mutex_t _mutex [1] ;
335 pthread_cond_t _cond [2] ; // one for relative times and one for abs.
336
337 public: // TODO-FIXME: make dtor private
338 ~PlatformParker() { guarantee (0, "invariant") ; }
339
340 public:
341 PlatformParker() {
342 int status;
343 status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr());
344 assert_status(status == 0, status, "cond_init rel");
345 status = pthread_cond_init (&_cond[ABS_INDEX], NULL);
346 assert_status(status == 0, status, "cond_init abs");
347 status = pthread_mutex_init (_mutex, NULL);
348 assert_status(status == 0, status, "mutex_init");
349 _cur_index = -1; // mark as unused
350 }
351 };
352
353 #endif // OS_LINUX_VM_OS_LINUX_HPP

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