Fri, 05 Aug 2011 16:50:14 -0700
7060836: RHEL 5.5 and 5.6 should support UseNUMA
Summary: Add a wrapper for sched_getcpu() for systems where libc lacks it
Reviewed-by: ysr
Contributed-by: Andrew John Hughes <ahughes@redhat.com>
1 /*
2 * Copyright (c) 1999, 2010, 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 */
25 #ifndef OS_LINUX_VM_OS_LINUX_HPP
26 #define OS_LINUX_VM_OS_LINUX_HPP
28 // Linux_OS defines the interface to Linux operating systems
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 *);
33 class Linux {
34 friend class os;
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&);
47 static void check_signal_handler(int sig);
49 // For signal flags diagnostics
50 static int sigflags[MAXSIGNUM];
52 static int (*_clock_gettime)(clockid_t, struct timespec *);
53 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
55 static address _initial_thread_stack_bottom;
56 static uintptr_t _initial_thread_stack_size;
58 static const char *_glibc_version;
59 static const char *_libpthread_version;
61 static bool _is_floating_stack;
62 static bool _is_NPTL;
63 static bool _supports_fast_thread_cpu_time;
65 static GrowableArray<int>* _cpu_to_node;
67 protected:
69 static julong _physical_memory;
70 static pthread_t _main_thread;
71 static Mutex* _createThread_lock;
72 static int _page_size;
74 static julong available_memory();
75 static julong physical_memory() { return _physical_memory; }
76 static void initialize_system_info();
78 static void set_glibc_version(const char *s) { _glibc_version = s; }
79 static void set_libpthread_version(const char *s) { _libpthread_version = s; }
81 static bool supports_variable_stack_size();
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; }
87 static void rebuild_cpu_to_node_map();
88 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
90 static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
92 public:
93 static void init_thread_fpu_state();
94 static int get_fpu_control_word();
95 static void set_fpu_control_word(int fpu_control);
96 static pthread_t main_thread(void) { return _main_thread; }
97 // returns kernel thread id (similar to LWP id on Solaris), which can be
98 // used to access /proc
99 static pid_t gettid();
100 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
101 static Mutex* createThread_lock(void) { return _createThread_lock; }
102 static void hotspot_sigmask(Thread* thread);
104 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
105 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
106 static bool is_initial_thread(void);
108 static int page_size(void) { return _page_size; }
109 static void set_page_size(int val) { _page_size = val; }
111 static address ucontext_get_pc(ucontext_t* uc);
112 static intptr_t* ucontext_get_sp(ucontext_t* uc);
113 static intptr_t* ucontext_get_fp(ucontext_t* uc);
115 // For Analyzer Forte AsyncGetCallTrace profiling support:
116 //
117 // This interface should be declared in os_linux_i486.hpp, but
118 // that file provides extensions to the os class and not the
119 // Linux class.
120 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
121 intptr_t** ret_sp, intptr_t** ret_fp);
123 // This boolean allows users to forward their own non-matching signals
124 // to JVM_handle_linux_signal, harmlessly.
125 static bool signal_handlers_are_installed;
127 static int get_our_sigflags(int);
128 static void set_our_sigflags(int, int);
129 static void signal_sets_init();
130 static void install_signal_handlers();
131 static void set_signal_handler(int, bool);
132 static bool is_sig_ignored(int sig);
134 static sigset_t* unblocked_signals();
135 static sigset_t* vm_signals();
136 static sigset_t* allowdebug_blocked_signals();
138 // For signal-chaining
139 static struct sigaction *get_chained_signal_action(int sig);
140 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
142 // GNU libc and libpthread version strings
143 static const char *glibc_version() { return _glibc_version; }
144 static const char *libpthread_version() { return _libpthread_version; }
146 // NPTL or LinuxThreads?
147 static bool is_LinuxThreads() { return !_is_NPTL; }
148 static bool is_NPTL() { return _is_NPTL; }
150 // NPTL is always floating stack. LinuxThreads could be using floating
151 // stack or fixed stack.
152 static bool is_floating_stack() { return _is_floating_stack; }
154 static void libpthread_init();
155 static bool libnuma_init();
156 static void* libnuma_dlsym(void* handle, const char* name);
157 // Minimum stack size a thread can be created with (allowing
158 // the VM to completely create the thread and enter user code)
159 static size_t min_stack_allowed;
161 // Return default stack size or guard size for the specified thread type
162 static size_t default_stack_size(os::ThreadType thr_type);
163 static size_t default_guard_size(os::ThreadType thr_type);
165 static void capture_initial_stack(size_t max_size);
167 // Stack overflow handling
168 static bool manually_expand_stack(JavaThread * t, address addr);
169 static int max_register_window_saves_before_flushing();
171 // Real-time clock functions
172 static void clock_init(void);
174 // fast POSIX clocks support
175 static void fast_thread_clock_init(void);
177 static bool supports_monotonic_clock() {
178 return _clock_gettime != NULL;
179 }
181 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
182 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
183 }
185 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
186 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
187 }
189 static bool supports_fast_thread_cpu_time() {
190 return _supports_fast_thread_cpu_time;
191 }
193 static jlong fast_thread_cpu_time(clockid_t clockid);
195 // Stack repair handling
197 // none present
199 // LinuxThreads work-around for 6292965
200 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
203 // Linux suspend/resume support - this helper is a shadow of its former
204 // self now that low-level suspension is barely used, and old workarounds
205 // for LinuxThreads are no longer needed.
206 class SuspendResume {
207 private:
208 volatile int _suspend_action;
209 // values for suspend_action:
210 #define SR_NONE (0x00)
211 #define SR_SUSPEND (0x01) // suspend request
212 #define SR_CONTINUE (0x02) // resume request
214 volatile jint _state;
215 // values for _state: + SR_NONE
216 #define SR_SUSPENDED (0x20)
217 public:
218 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
220 int suspend_action() const { return _suspend_action; }
221 void set_suspend_action(int x) { _suspend_action = x; }
223 // atomic updates for _state
224 void set_suspended() {
225 jint temp, temp2;
226 do {
227 temp = _state;
228 temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp);
229 } while (temp2 != temp);
230 }
231 void clear_suspended() {
232 jint temp, temp2;
233 do {
234 temp = _state;
235 temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp);
236 } while (temp2 != temp);
237 }
238 bool is_suspended() { return _state & SR_SUSPENDED; }
240 #undef SR_SUSPENDED
241 };
243 private:
244 typedef int (*sched_getcpu_func_t)(void);
245 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
246 typedef int (*numa_max_node_func_t)(void);
247 typedef int (*numa_available_func_t)(void);
248 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
249 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
251 static sched_getcpu_func_t _sched_getcpu;
252 static numa_node_to_cpus_func_t _numa_node_to_cpus;
253 static numa_max_node_func_t _numa_max_node;
254 static numa_available_func_t _numa_available;
255 static numa_tonode_memory_func_t _numa_tonode_memory;
256 static numa_interleave_memory_func_t _numa_interleave_memory;
257 static unsigned long* _numa_all_nodes;
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_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
266 static int sched_getcpu_syscall(void);
267 public:
268 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
269 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
270 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
271 }
272 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
273 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
274 static int numa_tonode_memory(void *start, size_t size, int node) {
275 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
276 }
277 static void numa_interleave_memory(void *start, size_t size) {
278 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
279 _numa_interleave_memory(start, size, _numa_all_nodes);
280 }
281 }
282 static int get_node_by_cpu(int cpu_id);
283 };
286 class PlatformEvent : public CHeapObj {
287 private:
288 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
289 volatile int _Event ;
290 volatile int _nParked ;
291 pthread_mutex_t _mutex [1] ;
292 pthread_cond_t _cond [1] ;
293 double PostPad [2] ;
294 Thread * _Assoc ;
296 public: // TODO-FIXME: make dtor private
297 ~PlatformEvent() { guarantee (0, "invariant") ; }
299 public:
300 PlatformEvent() {
301 int status;
302 status = pthread_cond_init (_cond, NULL);
303 assert_status(status == 0, status, "cond_init");
304 status = pthread_mutex_init (_mutex, NULL);
305 assert_status(status == 0, status, "mutex_init");
306 _Event = 0 ;
307 _nParked = 0 ;
308 _Assoc = NULL ;
309 }
311 // Use caution with reset() and fired() -- they may require MEMBARs
312 void reset() { _Event = 0 ; }
313 int fired() { return _Event; }
314 void park () ;
315 void unpark () ;
316 int TryPark () ;
317 int park (jlong millis) ;
318 void SetAssociation (Thread * a) { _Assoc = a ; }
319 } ;
321 class PlatformParker : public CHeapObj {
322 protected:
323 pthread_mutex_t _mutex [1] ;
324 pthread_cond_t _cond [1] ;
326 public: // TODO-FIXME: make dtor private
327 ~PlatformParker() { guarantee (0, "invariant") ; }
329 public:
330 PlatformParker() {
331 int status;
332 status = pthread_cond_init (_cond, NULL);
333 assert_status(status == 0, status, "cond_init");
334 status = pthread_mutex_init (_mutex, NULL);
335 assert_status(status == 0, status, "mutex_init");
336 }
337 } ;
339 #endif // OS_LINUX_VM_OS_LINUX_HPP