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annotate src/os/linux/vm/os_linux.hpp @ 8171:2ba078b2d311
Merge.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Thu, 07 Mar 2013 17:36:09 +0100 |
parents | fa9253dcd4df |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef OS_LINUX_VM_OS_LINUX_HPP |
26 #define OS_LINUX_VM_OS_LINUX_HPP | |
27 | |
0 | 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 class Linux { | |
34 friend class os; | |
35 | |
36 // For signal-chaining | |
37 #define MAXSIGNUM 32 | |
38 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions | |
39 static unsigned int sigs; // mask of signals that have | |
40 // preinstalled signal handlers | |
41 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), | |
42 // __sigaction(), signal() is loaded | |
43 static struct sigaction *(*get_signal_action)(int); | |
44 static struct sigaction *get_preinstalled_handler(int); | |
45 static void save_preinstalled_handler(int, struct sigaction&); | |
46 | |
47 static void check_signal_handler(int sig); | |
48 | |
49 // For signal flags diagnostics | |
50 static int sigflags[MAXSIGNUM]; | |
51 | |
52 static int (*_clock_gettime)(clockid_t, struct timespec *); | |
53 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); | |
54 | |
55 static address _initial_thread_stack_bottom; | |
56 static uintptr_t _initial_thread_stack_size; | |
57 | |
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58 static const char *_glibc_version; |
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59 static const char *_libpthread_version; |
0 | 60 |
61 static bool _is_floating_stack; | |
62 static bool _is_NPTL; | |
63 static bool _supports_fast_thread_cpu_time; | |
64 | |
141 | 65 static GrowableArray<int>* _cpu_to_node; |
66 | |
0 | 67 protected: |
68 | |
69 static julong _physical_memory; | |
70 static pthread_t _main_thread; | |
71 static Mutex* _createThread_lock; | |
72 static int _page_size; | |
73 | |
74 static julong available_memory(); | |
75 static julong physical_memory() { return _physical_memory; } | |
76 static void initialize_system_info(); | |
77 | |
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78 static void set_glibc_version(const char *s) { _glibc_version = s; } |
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79 static void set_libpthread_version(const char *s) { _libpthread_version = s; } |
0 | 80 |
81 static bool supports_variable_stack_size(); | |
82 | |
83 static void set_is_NPTL() { _is_NPTL = true; } | |
84 static void set_is_LinuxThreads() { _is_NPTL = false; } | |
85 static void set_is_floating_stack() { _is_floating_stack = true; } | |
86 | |
141 | 87 static void rebuild_cpu_to_node_map(); |
88 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } | |
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89 |
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90 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); |
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91 |
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92 static void print_full_memory_info(outputStream* st); |
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93 static void print_distro_info(outputStream* st); |
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94 static void print_libversion_info(outputStream* st); |
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95 |
0 | 96 public: |
97 static void init_thread_fpu_state(); | |
98 static int get_fpu_control_word(); | |
99 static void set_fpu_control_word(int fpu_control); | |
100 static pthread_t main_thread(void) { return _main_thread; } | |
101 // returns kernel thread id (similar to LWP id on Solaris), which can be | |
102 // used to access /proc | |
103 static pid_t gettid(); | |
104 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } | |
105 static Mutex* createThread_lock(void) { return _createThread_lock; } | |
106 static void hotspot_sigmask(Thread* thread); | |
107 | |
108 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } | |
109 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } | |
110 static bool is_initial_thread(void); | |
111 | |
112 static int page_size(void) { return _page_size; } | |
113 static void set_page_size(int val) { _page_size = val; } | |
114 | |
115 static address ucontext_get_pc(ucontext_t* uc); | |
116 static intptr_t* ucontext_get_sp(ucontext_t* uc); | |
117 static intptr_t* ucontext_get_fp(ucontext_t* uc); | |
118 | |
119 // For Analyzer Forte AsyncGetCallTrace profiling support: | |
120 // | |
121 // This interface should be declared in os_linux_i486.hpp, but | |
122 // that file provides extensions to the os class and not the | |
123 // Linux class. | |
124 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, | |
125 intptr_t** ret_sp, intptr_t** ret_fp); | |
126 | |
127 // This boolean allows users to forward their own non-matching signals | |
128 // to JVM_handle_linux_signal, harmlessly. | |
129 static bool signal_handlers_are_installed; | |
130 | |
131 static int get_our_sigflags(int); | |
132 static void set_our_sigflags(int, int); | |
133 static void signal_sets_init(); | |
134 static void install_signal_handlers(); | |
135 static void set_signal_handler(int, bool); | |
136 static bool is_sig_ignored(int sig); | |
137 | |
138 static sigset_t* unblocked_signals(); | |
139 static sigset_t* vm_signals(); | |
140 static sigset_t* allowdebug_blocked_signals(); | |
141 | |
142 // For signal-chaining | |
143 static struct sigaction *get_chained_signal_action(int sig); | |
144 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); | |
145 | |
146 // GNU libc and libpthread version strings | |
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147 static const char *glibc_version() { return _glibc_version; } |
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148 static const char *libpthread_version() { return _libpthread_version; } |
0 | 149 |
150 // NPTL or LinuxThreads? | |
151 static bool is_LinuxThreads() { return !_is_NPTL; } | |
152 static bool is_NPTL() { return _is_NPTL; } | |
153 | |
154 // NPTL is always floating stack. LinuxThreads could be using floating | |
155 // stack or fixed stack. | |
156 static bool is_floating_stack() { return _is_floating_stack; } | |
157 | |
158 static void libpthread_init(); | |
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159 static bool libnuma_init(); |
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160 static void* libnuma_dlsym(void* handle, const char* name); |
0 | 161 // Minimum stack size a thread can be created with (allowing |
162 // the VM to completely create the thread and enter user code) | |
163 static size_t min_stack_allowed; | |
164 | |
165 // Return default stack size or guard size for the specified thread type | |
166 static size_t default_stack_size(os::ThreadType thr_type); | |
167 static size_t default_guard_size(os::ThreadType thr_type); | |
168 | |
169 static void capture_initial_stack(size_t max_size); | |
170 | |
171 // Stack overflow handling | |
172 static bool manually_expand_stack(JavaThread * t, address addr); | |
173 static int max_register_window_saves_before_flushing(); | |
174 | |
175 // Real-time clock functions | |
176 static void clock_init(void); | |
177 | |
178 // fast POSIX clocks support | |
179 static void fast_thread_clock_init(void); | |
180 | |
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181 static inline bool supports_monotonic_clock() { |
0 | 182 return _clock_gettime != NULL; |
183 } | |
184 | |
185 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { | |
186 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; | |
187 } | |
188 | |
189 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { | |
190 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; | |
191 } | |
192 | |
193 static bool supports_fast_thread_cpu_time() { | |
194 return _supports_fast_thread_cpu_time; | |
195 } | |
196 | |
197 static jlong fast_thread_cpu_time(clockid_t clockid); | |
198 | |
199 // Stack repair handling | |
200 | |
201 // none present | |
202 | |
203 // LinuxThreads work-around for 6292965 | |
204 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); | |
205 | |
206 | |
207 // Linux suspend/resume support - this helper is a shadow of its former | |
208 // self now that low-level suspension is barely used, and old workarounds | |
209 // for LinuxThreads are no longer needed. | |
210 class SuspendResume { | |
211 private: | |
212 volatile int _suspend_action; | |
213 // values for suspend_action: | |
214 #define SR_NONE (0x00) | |
215 #define SR_SUSPEND (0x01) // suspend request | |
216 #define SR_CONTINUE (0x02) // resume request | |
217 | |
218 volatile jint _state; | |
219 // values for _state: + SR_NONE | |
220 #define SR_SUSPENDED (0x20) | |
221 public: | |
222 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; } | |
223 | |
224 int suspend_action() const { return _suspend_action; } | |
225 void set_suspend_action(int x) { _suspend_action = x; } | |
226 | |
227 // atomic updates for _state | |
228 void set_suspended() { | |
229 jint temp, temp2; | |
230 do { | |
231 temp = _state; | |
232 temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp); | |
233 } while (temp2 != temp); | |
234 } | |
235 void clear_suspended() { | |
236 jint temp, temp2; | |
237 do { | |
238 temp = _state; | |
239 temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp); | |
240 } while (temp2 != temp); | |
241 } | |
242 bool is_suspended() { return _state & SR_SUSPENDED; } | |
243 | |
244 #undef SR_SUSPENDED | |
245 }; | |
141 | 246 |
247 private: | |
248 typedef int (*sched_getcpu_func_t)(void); | |
249 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); | |
250 typedef int (*numa_max_node_func_t)(void); | |
251 typedef int (*numa_available_func_t)(void); | |
252 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); | |
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253 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); |
141 | 254 |
255 static sched_getcpu_func_t _sched_getcpu; | |
256 static numa_node_to_cpus_func_t _numa_node_to_cpus; | |
257 static numa_max_node_func_t _numa_max_node; | |
258 static numa_available_func_t _numa_available; | |
259 static numa_tonode_memory_func_t _numa_tonode_memory; | |
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260 static numa_interleave_memory_func_t _numa_interleave_memory; |
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261 static unsigned long* _numa_all_nodes; |
141 | 262 |
263 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } | |
264 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } | |
265 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } | |
266 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } | |
267 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } | |
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268 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } |
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269 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } |
3826 | 270 static int sched_getcpu_syscall(void); |
141 | 271 public: |
272 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } | |
273 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { | |
274 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; | |
275 } | |
276 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } | |
277 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } | |
278 static int numa_tonode_memory(void *start, size_t size, int node) { | |
279 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; | |
280 } | |
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281 static void numa_interleave_memory(void *start, size_t size) { |
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282 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { |
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283 _numa_interleave_memory(start, size, _numa_all_nodes); |
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284 } |
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285 } |
141 | 286 static int get_node_by_cpu(int cpu_id); |
0 | 287 }; |
288 | |
289 | |
6197 | 290 class PlatformEvent : public CHeapObj<mtInternal> { |
0 | 291 private: |
292 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line | |
293 volatile int _Event ; | |
294 volatile int _nParked ; | |
295 pthread_mutex_t _mutex [1] ; | |
296 pthread_cond_t _cond [1] ; | |
297 double PostPad [2] ; | |
298 Thread * _Assoc ; | |
299 | |
300 public: // TODO-FIXME: make dtor private | |
301 ~PlatformEvent() { guarantee (0, "invariant") ; } | |
302 | |
303 public: | |
304 PlatformEvent() { | |
305 int status; | |
306 status = pthread_cond_init (_cond, NULL); | |
307 assert_status(status == 0, status, "cond_init"); | |
308 status = pthread_mutex_init (_mutex, NULL); | |
309 assert_status(status == 0, status, "mutex_init"); | |
310 _Event = 0 ; | |
311 _nParked = 0 ; | |
312 _Assoc = NULL ; | |
313 } | |
314 | |
315 // Use caution with reset() and fired() -- they may require MEMBARs | |
316 void reset() { _Event = 0 ; } | |
317 int fired() { return _Event; } | |
318 void park () ; | |
319 void unpark () ; | |
320 int TryPark () ; | |
321 int park (jlong millis) ; | |
322 void SetAssociation (Thread * a) { _Assoc = a ; } | |
323 } ; | |
324 | |
6197 | 325 class PlatformParker : public CHeapObj<mtInternal> { |
0 | 326 protected: |
327 pthread_mutex_t _mutex [1] ; | |
328 pthread_cond_t _cond [1] ; | |
329 | |
330 public: // TODO-FIXME: make dtor private | |
331 ~PlatformParker() { guarantee (0, "invariant") ; } | |
332 | |
333 public: | |
334 PlatformParker() { | |
335 int status; | |
336 status = pthread_cond_init (_cond, NULL); | |
337 assert_status(status == 0, status, "cond_init"); | |
338 status = pthread_mutex_init (_mutex, NULL); | |
339 assert_status(status == 0, status, "mutex_init"); | |
340 } | |
341 } ; | |
1972 | 342 |
343 #endif // OS_LINUX_VM_OS_LINUX_HPP |