Mon, 17 Sep 2012 10:20:04 -0400
7190089: NMT ON: NMT failed assertion on thread's stack base address
Summary: Solaris only, record stack info to NMT after stack size adjustment was made for primordial threads
Reviewed-by: kvn, acorn, coleenp
zgu@3900 | 1 | /* |
zgu@3900 | 2 | * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
zgu@3900 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
zgu@3900 | 4 | * |
zgu@3900 | 5 | * This code is free software; you can redistribute it and/or modify it |
zgu@3900 | 6 | * under the terms of the GNU General Public License version 2 only, as |
zgu@3900 | 7 | * published by the Free Software Foundation. |
zgu@3900 | 8 | * |
zgu@3900 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
zgu@3900 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
zgu@3900 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
zgu@3900 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
zgu@3900 | 13 | * accompanied this code). |
zgu@3900 | 14 | * |
zgu@3900 | 15 | * You should have received a copy of the GNU General Public License version |
zgu@3900 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
zgu@3900 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
zgu@3900 | 18 | * |
zgu@3900 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
zgu@3900 | 20 | * or visit www.oracle.com if you need additional information or have any |
zgu@3900 | 21 | * questions. |
zgu@3900 | 22 | * |
zgu@3900 | 23 | */ |
zgu@3900 | 24 | |
zgu@3900 | 25 | #ifndef SHARE_VM_SERVICES_MEM_TRACKER_HPP |
zgu@3900 | 26 | #define SHARE_VM_SERVICES_MEM_TRACKER_HPP |
zgu@3900 | 27 | |
zgu@3900 | 28 | #include "memory/allocation.hpp" |
zgu@3900 | 29 | #include "runtime/globals.hpp" |
zgu@3900 | 30 | #include "runtime/mutex.hpp" |
zgu@3900 | 31 | #include "runtime/os.hpp" |
zgu@3900 | 32 | #include "runtime/thread.hpp" |
zgu@3900 | 33 | #include "services/memPtr.hpp" |
zgu@3900 | 34 | #include "services/memRecorder.hpp" |
zgu@3900 | 35 | #include "services/memSnapshot.hpp" |
zgu@3900 | 36 | #include "services/memTrackWorker.hpp" |
zgu@3900 | 37 | |
zgu@3900 | 38 | #ifdef SOLARIS |
zgu@3900 | 39 | #include "thread_solaris.inline.hpp" |
zgu@3900 | 40 | #endif |
zgu@3900 | 41 | |
zgu@4053 | 42 | #ifdef _DEBUG |
zgu@3900 | 43 | #define DEBUG_CALLER_PC os::get_caller_pc(3) |
zgu@3900 | 44 | #else |
zgu@3900 | 45 | #define DEBUG_CALLER_PC 0 |
zgu@3900 | 46 | #endif |
zgu@3900 | 47 | |
zgu@3900 | 48 | // The thread closure walks threads to collect per-thread |
zgu@3900 | 49 | // memory recorders at NMT sync point |
zgu@3900 | 50 | class SyncThreadRecorderClosure : public ThreadClosure { |
zgu@3900 | 51 | private: |
zgu@3900 | 52 | int _thread_count; |
zgu@3900 | 53 | |
zgu@3900 | 54 | public: |
zgu@3900 | 55 | SyncThreadRecorderClosure() { |
zgu@3900 | 56 | _thread_count =0; |
zgu@3900 | 57 | } |
zgu@3900 | 58 | |
zgu@3900 | 59 | void do_thread(Thread* thread); |
zgu@3900 | 60 | int get_thread_count() const { |
zgu@3900 | 61 | return _thread_count; |
zgu@3900 | 62 | } |
zgu@3900 | 63 | }; |
zgu@3900 | 64 | |
zgu@3900 | 65 | class BaselineOutputer; |
zgu@3900 | 66 | class MemSnapshot; |
zgu@3900 | 67 | class MemTrackWorker; |
zgu@3900 | 68 | class Thread; |
zgu@3900 | 69 | /* |
zgu@3900 | 70 | * MemTracker is the 'gate' class to native memory tracking runtime. |
zgu@3900 | 71 | */ |
zgu@3900 | 72 | class MemTracker : AllStatic { |
zgu@3900 | 73 | friend class MemTrackWorker; |
zgu@3900 | 74 | friend class MemSnapshot; |
zgu@3900 | 75 | friend class SyncThreadRecorderClosure; |
zgu@3900 | 76 | |
zgu@3900 | 77 | // NMT state |
zgu@3900 | 78 | enum NMTStates { |
zgu@3900 | 79 | NMT_uninited, // not yet initialized |
zgu@3900 | 80 | NMT_bootstrapping_single_thread, // bootstrapping, VM is in single thread mode |
zgu@3900 | 81 | NMT_bootstrapping_multi_thread, // bootstrapping, VM is about to enter multi-thread mode |
zgu@3900 | 82 | NMT_started, // NMT fully started |
zgu@3900 | 83 | NMT_shutdown_pending, // shutdown pending |
zgu@3900 | 84 | NMT_final_shutdown, // in final phase of shutdown |
zgu@3900 | 85 | NMT_shutdown // shutdown |
zgu@3900 | 86 | }; |
zgu@3900 | 87 | |
zgu@3900 | 88 | |
zgu@3900 | 89 | // native memory tracking level |
zgu@3900 | 90 | enum NMTLevel { |
zgu@3900 | 91 | NMT_off, // native memory tracking is off |
zgu@3900 | 92 | NMT_summary, // don't track callsite |
zgu@3900 | 93 | NMT_detail // track callsite also |
zgu@3900 | 94 | }; |
zgu@3900 | 95 | |
zgu@3900 | 96 | public: |
zgu@3900 | 97 | enum ShutdownReason { |
zgu@3900 | 98 | NMT_shutdown_none, // no shutdown requested |
zgu@3900 | 99 | NMT_shutdown_user, // user requested shutdown |
zgu@3900 | 100 | NMT_normal, // normal shutdown, process exit |
zgu@3900 | 101 | NMT_out_of_memory, // shutdown due to out of memory |
zgu@3900 | 102 | NMT_initialization, // shutdown due to initialization failure |
zgu@3900 | 103 | NMT_use_malloc_only, // can not combine NMT with UseMallocOnly flag |
zgu@3900 | 104 | NMT_error_reporting, // shutdown by vmError::report_and_die() |
zgu@3900 | 105 | NMT_out_of_generation, // running out of generation queue |
zgu@3900 | 106 | NMT_sequence_overflow // overflow the sequence number |
zgu@3900 | 107 | }; |
zgu@3900 | 108 | |
zgu@3900 | 109 | public: |
zgu@3900 | 110 | // initialize NMT tracking level from command line options, called |
zgu@3900 | 111 | // from VM command line parsing code |
zgu@3900 | 112 | static void init_tracking_options(const char* option_line); |
zgu@3900 | 113 | |
zgu@3900 | 114 | // if NMT is enabled to record memory activities |
zgu@3900 | 115 | static inline bool is_on() { |
zgu@3900 | 116 | return (_tracking_level >= NMT_summary && |
zgu@3900 | 117 | _state >= NMT_bootstrapping_single_thread); |
zgu@3900 | 118 | } |
zgu@3900 | 119 | |
zgu@3900 | 120 | // user readable reason for shutting down NMT |
zgu@3900 | 121 | static const char* reason() { |
zgu@3900 | 122 | switch(_reason) { |
zgu@3900 | 123 | case NMT_shutdown_none: |
zgu@3900 | 124 | return "Native memory tracking is not enabled"; |
zgu@3900 | 125 | case NMT_shutdown_user: |
zgu@3900 | 126 | return "Native memory tracking has been shutdown by user"; |
zgu@3900 | 127 | case NMT_normal: |
zgu@3900 | 128 | return "Native memory tracking has been shutdown due to process exiting"; |
zgu@3936 | 129 | case NMT_out_of_memory: |
zgu@3936 | 130 | return "Native memory tracking has been shutdown due to out of native memory"; |
zgu@3900 | 131 | case NMT_initialization: |
zgu@3900 | 132 | return "Native memory tracking failed to initialize"; |
zgu@3900 | 133 | case NMT_error_reporting: |
zgu@3900 | 134 | return "Native memory tracking has been shutdown due to error reporting"; |
zgu@3900 | 135 | case NMT_out_of_generation: |
zgu@3900 | 136 | return "Native memory tracking has been shutdown due to running out of generation buffer"; |
zgu@3900 | 137 | case NMT_sequence_overflow: |
zgu@3900 | 138 | return "Native memory tracking has been shutdown due to overflow the sequence number"; |
zgu@3900 | 139 | case NMT_use_malloc_only: |
zgu@3900 | 140 | return "Native memory tracking is not supported when UseMallocOnly is on"; |
zgu@3900 | 141 | default: |
zgu@3900 | 142 | ShouldNotReachHere(); |
zgu@3900 | 143 | return NULL; |
zgu@3900 | 144 | } |
zgu@3900 | 145 | } |
zgu@3900 | 146 | |
zgu@3900 | 147 | // test if we can walk native stack |
zgu@3900 | 148 | static bool can_walk_stack() { |
zgu@3900 | 149 | // native stack is not walkable during bootstrapping on sparc |
zgu@3900 | 150 | #if defined(SPARC) |
zgu@3900 | 151 | return (_state == NMT_started); |
zgu@3900 | 152 | #else |
zgu@3900 | 153 | return (_state >= NMT_bootstrapping_single_thread && _state <= NMT_started); |
zgu@3900 | 154 | #endif |
zgu@3900 | 155 | } |
zgu@3900 | 156 | |
zgu@3900 | 157 | // if native memory tracking tracks callsite |
zgu@3900 | 158 | static inline bool track_callsite() { return _tracking_level == NMT_detail; } |
zgu@3900 | 159 | |
zgu@3900 | 160 | // shutdown native memory tracking capability. Native memory tracking |
zgu@3900 | 161 | // can be shutdown by VM when it encounters low memory scenarios. |
zgu@3900 | 162 | // Memory tracker should gracefully shutdown itself, and preserve the |
zgu@3900 | 163 | // latest memory statistics for post morten diagnosis. |
zgu@3900 | 164 | static void shutdown(ShutdownReason reason); |
zgu@3900 | 165 | |
zgu@3900 | 166 | // if there is shutdown requested |
zgu@3900 | 167 | static inline bool shutdown_in_progress() { |
zgu@3900 | 168 | return (_state >= NMT_shutdown_pending); |
zgu@3900 | 169 | } |
zgu@3900 | 170 | |
zgu@3900 | 171 | // bootstrap native memory tracking, so it can start to collect raw data |
zgu@3900 | 172 | // before worker thread can start |
zgu@3900 | 173 | |
zgu@3900 | 174 | // the first phase of bootstrapping, when VM still in single-threaded mode |
zgu@3900 | 175 | static void bootstrap_single_thread(); |
zgu@3900 | 176 | // the second phase of bootstrapping, VM is about or already in multi-threaded mode |
zgu@3900 | 177 | static void bootstrap_multi_thread(); |
zgu@3900 | 178 | |
zgu@3900 | 179 | |
zgu@3900 | 180 | // start() has to be called when VM still in single thread mode, but after |
zgu@3900 | 181 | // command line option parsing is done. |
zgu@3900 | 182 | static void start(); |
zgu@3900 | 183 | |
zgu@3900 | 184 | // record a 'malloc' call |
zgu@3900 | 185 | static inline void record_malloc(address addr, size_t size, MEMFLAGS flags, |
zgu@3900 | 186 | address pc = 0, Thread* thread = NULL) { |
zgu@3900 | 187 | if (NMT_CAN_TRACK(flags)) { |
zgu@4079 | 188 | assert(size > 0, "Sanity check"); |
zgu@3900 | 189 | create_memory_record(addr, (flags|MemPointerRecord::malloc_tag()), size, pc, thread); |
zgu@3900 | 190 | } |
zgu@3900 | 191 | } |
zgu@3900 | 192 | // record a 'free' call |
zgu@3900 | 193 | static inline void record_free(address addr, MEMFLAGS flags, Thread* thread = NULL) { |
zgu@3900 | 194 | if (is_on() && NMT_CAN_TRACK(flags)) { |
zgu@3900 | 195 | create_memory_record(addr, MemPointerRecord::free_tag(), 0, 0, thread); |
zgu@3900 | 196 | } |
zgu@3900 | 197 | } |
zgu@3900 | 198 | // record a 'realloc' call |
zgu@3900 | 199 | static inline void record_realloc(address old_addr, address new_addr, size_t size, |
zgu@3900 | 200 | MEMFLAGS flags, address pc = 0, Thread* thread = NULL) { |
zgu@3900 | 201 | if (is_on()) { |
zgu@4079 | 202 | assert(size > 0, "Sanity check"); |
zgu@3900 | 203 | record_free(old_addr, flags, thread); |
zgu@3900 | 204 | record_malloc(new_addr, size, flags, pc, thread); |
zgu@3900 | 205 | } |
zgu@3900 | 206 | } |
zgu@3900 | 207 | |
zgu@3900 | 208 | // record arena size |
zgu@3900 | 209 | static inline void record_arena_size(address addr, size_t size) { |
zgu@3900 | 210 | // we add a positive offset to arena address, so we can have arena size record |
zgu@3900 | 211 | // sorted after arena record |
zgu@3900 | 212 | if (is_on() && !UseMallocOnly) { |
zgu@4079 | 213 | assert(addr != NULL, "Sanity check"); |
zgu@3900 | 214 | create_memory_record((addr + sizeof(void*)), MemPointerRecord::arena_size_tag(), size, |
zgu@3900 | 215 | 0, NULL); |
zgu@3900 | 216 | } |
zgu@3900 | 217 | } |
zgu@3900 | 218 | |
zgu@3900 | 219 | // record a virtual memory 'reserve' call |
zgu@3900 | 220 | static inline void record_virtual_memory_reserve(address addr, size_t size, |
zgu@3900 | 221 | address pc = 0, Thread* thread = NULL) { |
zgu@3900 | 222 | if (is_on()) { |
zgu@4079 | 223 | assert(size > 0, "Sanity check"); |
zgu@3900 | 224 | create_memory_record(addr, MemPointerRecord::virtual_memory_reserve_tag(), |
zgu@3900 | 225 | size, pc, thread); |
zgu@3900 | 226 | } |
zgu@3900 | 227 | } |
zgu@3900 | 228 | |
zgu@4053 | 229 | static inline void record_thread_stack(address addr, size_t size, Thread* thr, |
zgu@4053 | 230 | address pc = 0) { |
zgu@4053 | 231 | if (is_on()) { |
zgu@4053 | 232 | assert(size > 0 && thr != NULL, "Sanity check"); |
zgu@4053 | 233 | create_memory_record(addr, MemPointerRecord::virtual_memory_reserve_tag() | mtThreadStack, |
zgu@4053 | 234 | size, pc, thr); |
zgu@4053 | 235 | create_memory_record(addr, MemPointerRecord::virtual_memory_commit_tag() | mtThreadStack, |
zgu@4053 | 236 | size, pc, thr); |
zgu@4053 | 237 | } |
zgu@4053 | 238 | } |
zgu@4053 | 239 | |
zgu@4053 | 240 | static inline void release_thread_stack(address addr, size_t size, Thread* thr) { |
zgu@4053 | 241 | if (is_on()) { |
zgu@4053 | 242 | assert(size > 0 && thr != NULL, "Sanity check"); |
zgu@4053 | 243 | create_memory_record(addr, MemPointerRecord::virtual_memory_uncommit_tag() | mtThreadStack, |
zgu@4053 | 244 | size, DEBUG_CALLER_PC, thr); |
zgu@4053 | 245 | create_memory_record(addr, MemPointerRecord::virtual_memory_release_tag() | mtThreadStack, |
zgu@4053 | 246 | size, DEBUG_CALLER_PC, thr); |
zgu@4053 | 247 | } |
zgu@4053 | 248 | } |
zgu@4053 | 249 | |
zgu@3900 | 250 | // record a virtual memory 'commit' call |
zgu@3900 | 251 | static inline void record_virtual_memory_commit(address addr, size_t size, |
zgu@3900 | 252 | address pc = 0, Thread* thread = NULL) { |
zgu@3900 | 253 | if (is_on()) { |
zgu@4079 | 254 | assert(size > 0, "Sanity check"); |
zgu@3900 | 255 | create_memory_record(addr, MemPointerRecord::virtual_memory_commit_tag(), |
zgu@4053 | 256 | size, DEBUG_CALLER_PC, thread); |
zgu@3900 | 257 | } |
zgu@3900 | 258 | } |
zgu@3900 | 259 | |
zgu@3900 | 260 | // record a virtual memory 'uncommit' call |
zgu@3900 | 261 | static inline void record_virtual_memory_uncommit(address addr, size_t size, |
zgu@3900 | 262 | Thread* thread = NULL) { |
zgu@3900 | 263 | if (is_on()) { |
zgu@4079 | 264 | assert(size > 0, "Sanity check"); |
zgu@3900 | 265 | create_memory_record(addr, MemPointerRecord::virtual_memory_uncommit_tag(), |
zgu@4053 | 266 | size, DEBUG_CALLER_PC, thread); |
zgu@3900 | 267 | } |
zgu@3900 | 268 | } |
zgu@3900 | 269 | |
zgu@3900 | 270 | // record a virtual memory 'release' call |
zgu@3900 | 271 | static inline void record_virtual_memory_release(address addr, size_t size, |
zgu@3900 | 272 | Thread* thread = NULL) { |
zgu@3900 | 273 | if (is_on()) { |
zgu@4079 | 274 | assert(size > 0, "Sanity check"); |
zgu@3900 | 275 | create_memory_record(addr, MemPointerRecord::virtual_memory_release_tag(), |
zgu@4053 | 276 | size, DEBUG_CALLER_PC, thread); |
zgu@3900 | 277 | } |
zgu@3900 | 278 | } |
zgu@3900 | 279 | |
zgu@3900 | 280 | // record memory type on virtual memory base address |
zgu@3900 | 281 | static inline void record_virtual_memory_type(address base, MEMFLAGS flags, |
zgu@3900 | 282 | Thread* thread = NULL) { |
zgu@3900 | 283 | if (is_on()) { |
zgu@3900 | 284 | assert(base > 0, "wrong base address"); |
zgu@3900 | 285 | assert((flags & (~mt_masks)) == 0, "memory type only"); |
zgu@3900 | 286 | create_memory_record(base, (flags | MemPointerRecord::virtual_memory_type_tag()), |
zgu@4053 | 287 | 0, DEBUG_CALLER_PC, thread); |
zgu@3900 | 288 | } |
zgu@3900 | 289 | } |
zgu@3900 | 290 | |
zgu@3900 | 291 | |
zgu@3900 | 292 | // create memory baseline of current memory snapshot |
zgu@3900 | 293 | static bool baseline(); |
zgu@3900 | 294 | // is there a memory baseline |
zgu@3900 | 295 | static bool has_baseline() { |
zgu@3900 | 296 | return _baseline.baselined(); |
zgu@3900 | 297 | } |
zgu@3900 | 298 | |
zgu@3900 | 299 | // print memory usage from current snapshot |
zgu@3900 | 300 | static bool print_memory_usage(BaselineOutputer& out, size_t unit, |
zgu@3900 | 301 | bool summary_only = true); |
zgu@3900 | 302 | // compare memory usage between current snapshot and baseline |
zgu@3900 | 303 | static bool compare_memory_usage(BaselineOutputer& out, size_t unit, |
zgu@3900 | 304 | bool summary_only = true); |
zgu@3900 | 305 | |
zgu@3900 | 306 | // sync is called within global safepoint to synchronize nmt data |
zgu@3900 | 307 | static void sync(); |
zgu@3900 | 308 | |
zgu@3900 | 309 | // called when a thread is about to exit |
zgu@3900 | 310 | static void thread_exiting(JavaThread* thread); |
zgu@3900 | 311 | |
zgu@3900 | 312 | // retrieve global snapshot |
zgu@3900 | 313 | static MemSnapshot* get_snapshot() { |
zgu@3900 | 314 | if (shutdown_in_progress()) { |
zgu@3900 | 315 | return NULL; |
zgu@3900 | 316 | } |
zgu@3900 | 317 | return _snapshot; |
zgu@3900 | 318 | } |
zgu@3900 | 319 | |
zgu@3900 | 320 | // print tracker stats |
zgu@3900 | 321 | NOT_PRODUCT(static void print_tracker_stats(outputStream* st);) |
zgu@3900 | 322 | NOT_PRODUCT(static void walk_stack(int toSkip, char* buf, int len);) |
zgu@3900 | 323 | |
zgu@3900 | 324 | private: |
zgu@3900 | 325 | // start native memory tracking worker thread |
zgu@3900 | 326 | static bool start_worker(); |
zgu@3900 | 327 | |
zgu@3900 | 328 | // called by worker thread to complete shutdown process |
zgu@3900 | 329 | static void final_shutdown(); |
zgu@3900 | 330 | |
zgu@3900 | 331 | protected: |
zgu@3900 | 332 | // retrieve per-thread recorder of the specified thread. |
zgu@3900 | 333 | // if the recorder is full, it will be enqueued to overflow |
zgu@3900 | 334 | // queue, a new recorder is acquired from recorder pool or a |
zgu@3900 | 335 | // new instance is created. |
zgu@3900 | 336 | // when thread == NULL, it means global recorder |
zgu@3900 | 337 | static MemRecorder* get_thread_recorder(JavaThread* thread); |
zgu@3900 | 338 | |
zgu@3900 | 339 | // per-thread recorder pool |
zgu@3900 | 340 | static void release_thread_recorder(MemRecorder* rec); |
zgu@3900 | 341 | static void delete_all_pooled_recorders(); |
zgu@3900 | 342 | |
zgu@3900 | 343 | // pending recorder queue. Recorders are queued to pending queue |
zgu@3900 | 344 | // when they are overflowed or collected at nmt sync point. |
zgu@3900 | 345 | static void enqueue_pending_recorder(MemRecorder* rec); |
zgu@3900 | 346 | static MemRecorder* get_pending_recorders(); |
zgu@3900 | 347 | static void delete_all_pending_recorders(); |
zgu@3900 | 348 | |
zgu@3900 | 349 | private: |
zgu@3900 | 350 | // retrieve a pooled memory record or create new one if there is not |
zgu@3900 | 351 | // one available |
zgu@3900 | 352 | static MemRecorder* get_new_or_pooled_instance(); |
zgu@3900 | 353 | static void create_memory_record(address addr, MEMFLAGS type, |
zgu@3900 | 354 | size_t size, address pc, Thread* thread); |
zgu@3900 | 355 | static void create_record_in_recorder(address addr, MEMFLAGS type, |
zgu@3935 | 356 | size_t size, address pc, JavaThread* thread); |
zgu@3900 | 357 | |
zgu@3900 | 358 | private: |
zgu@3900 | 359 | // global memory snapshot |
zgu@3900 | 360 | static MemSnapshot* _snapshot; |
zgu@3900 | 361 | |
zgu@3900 | 362 | // a memory baseline of snapshot |
zgu@3900 | 363 | static MemBaseline _baseline; |
zgu@3900 | 364 | |
zgu@3900 | 365 | // query lock |
zgu@3936 | 366 | static Mutex* _query_lock; |
zgu@3900 | 367 | |
zgu@3900 | 368 | // a thread can start to allocate memory before it is attached |
zgu@3900 | 369 | // to VM 'Thread', those memory activities are recorded here. |
zgu@3900 | 370 | // ThreadCritical is required to guard this global recorder. |
zgu@3900 | 371 | static MemRecorder* _global_recorder; |
zgu@3900 | 372 | |
zgu@3900 | 373 | // main thread id |
zgu@3900 | 374 | debug_only(static intx _main_thread_tid;) |
zgu@3900 | 375 | |
zgu@3900 | 376 | // pending recorders to be merged |
zgu@3900 | 377 | static volatile MemRecorder* _merge_pending_queue; |
zgu@3900 | 378 | |
zgu@3900 | 379 | NOT_PRODUCT(static volatile jint _pending_recorder_count;) |
zgu@3900 | 380 | |
zgu@3900 | 381 | // pooled memory recorders |
zgu@3900 | 382 | static volatile MemRecorder* _pooled_recorders; |
zgu@3900 | 383 | |
zgu@3900 | 384 | // memory recorder pool management, uses following |
zgu@3900 | 385 | // counter to determine if a released memory recorder |
zgu@3900 | 386 | // should be pooled |
zgu@3900 | 387 | |
zgu@3900 | 388 | // latest thread count |
zgu@3900 | 389 | static int _thread_count; |
zgu@3900 | 390 | // pooled recorder count |
zgu@3900 | 391 | static volatile jint _pooled_recorder_count; |
zgu@3900 | 392 | |
zgu@3900 | 393 | |
zgu@3900 | 394 | // worker thread to merge pending recorders into snapshot |
zgu@3900 | 395 | static MemTrackWorker* _worker_thread; |
zgu@3900 | 396 | |
zgu@3900 | 397 | // how many safepoints we skipped without entering sync point |
zgu@3900 | 398 | static int _sync_point_skip_count; |
zgu@3900 | 399 | |
zgu@3900 | 400 | // if the tracker is properly intialized |
zgu@3900 | 401 | static bool _is_tracker_ready; |
zgu@3900 | 402 | // tracking level (off, summary and detail) |
zgu@3900 | 403 | static enum NMTLevel _tracking_level; |
zgu@3900 | 404 | |
zgu@3900 | 405 | // current nmt state |
zgu@3900 | 406 | static volatile enum NMTStates _state; |
zgu@3900 | 407 | // the reason for shutting down nmt |
zgu@3900 | 408 | static enum ShutdownReason _reason; |
zgu@3900 | 409 | }; |
zgu@3900 | 410 | |
zgu@3900 | 411 | #endif // SHARE_VM_SERVICES_MEM_TRACKER_HPP |