release/src-rt-6.x/linux/linux-2.6/arch/s390/appldata/appldata_base.c

   1 /*
   2  * arch/s390/appldata/appldata_base.c
   3  *
   4  * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
   5  * Exports appldata_register_ops() and appldata_unregister_ops() for the
   6  * data gathering modules.
   7  *
   8  * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
   9  *
  10  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/errno.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/mm.h>
  20 #include <linux/swap.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/sysctl.h>
  23 #include <linux/notifier.h>
  24 #include <linux/cpu.h>
  25 #include <linux/workqueue.h>
  26 #include <asm/appldata.h>
  27 #include <asm/timer.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30 #include <asm/smp.h>
  31
  32 #include "appldata.h"
  33
  34
  35 #define MY_PRINT_NAME   "appldata"              /* for debug messages, etc. */
  36 #define APPLDATA_CPU_INTERVAL   10000           /* default (CPU) time for
  37                                                    sampling interval in
  38                                                    milliseconds */
  39
  40 #define TOD_MICRO       0x01000                 /* nr. of TOD clock units
  41                                                    for 1 microsecond */
  42 /*
  43  * /proc entries (sysctl)
  44  */
  45 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
  46 static int appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
  47                                   void __user *buffer, size_t *lenp, loff_t *ppos);
  48 static int appldata_interval_handler(ctl_table *ctl, int write,
  49                                          struct file *filp,
  50                                          void __user *buffer,
  51                                          size_t *lenp, loff_t *ppos);
  52
  53 static struct ctl_table_header *appldata_sysctl_header;
  54 static struct ctl_table appldata_table[] = {
  55         {
  56                 .ctl_name       = CTL_APPLDATA_TIMER,
  57                 .procname       = "timer",
  58                 .mode           = S_IRUGO | S_IWUSR,
  59                 .proc_handler   = &appldata_timer_handler,
  60         },
  61         {
  62                 .ctl_name       = CTL_APPLDATA_INTERVAL,
  63                 .procname       = "interval",
  64                 .mode           = S_IRUGO | S_IWUSR,
  65                 .proc_handler   = &appldata_interval_handler,
  66         },
  67         { .ctl_name = 0 }
  68 };
  69
  70 static struct ctl_table appldata_dir_table[] = {
  71         {
  72                 .ctl_name       = CTL_APPLDATA,
  73                 .procname       = appldata_proc_name,
  74                 .maxlen         = 0,
  75                 .mode           = S_IRUGO | S_IXUGO,
  76                 .child          = appldata_table,
  77         },
  78         { .ctl_name = 0 }
  79 };
  80
  81 /*
  82  * Timer
  83  */
  84 static DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
  85 static atomic_t appldata_expire_count = ATOMIC_INIT(0);
  86
  87 static DEFINE_SPINLOCK(appldata_timer_lock);
  88 static int appldata_interval = APPLDATA_CPU_INTERVAL;
  89 static int appldata_timer_active;
  90
  91 /*
  92  * Work queue
  93  */
  94 static struct workqueue_struct *appldata_wq;
  95 static void appldata_work_fn(struct work_struct *work);
  96 static DECLARE_WORK(appldata_work, appldata_work_fn);
  97
  98
  99 /*
 100  * Ops list
 101  */
 102 static DEFINE_SPINLOCK(appldata_ops_lock);
 103 static LIST_HEAD(appldata_ops_list);
 104
 105
 106 /*************************** timer, work, DIAG *******************************/
 107 /*
 108  * appldata_timer_function()
 109  *
 110  * schedule work and reschedule timer
 111  */
 112 static void appldata_timer_function(unsigned long data)
 113 {
 114         P_DEBUG("   -= Timer =-\n");
 115         P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
 116                 atomic_read(&appldata_expire_count));
 117         if (atomic_dec_and_test(&appldata_expire_count)) {
 118                 atomic_set(&appldata_expire_count, num_online_cpus());
 119                 queue_work(appldata_wq, (struct work_struct *) data);
 120         }
 121 }
 122
 123 /*
 124  * appldata_work_fn()
 125  *
 126  * call data gathering function for each (active) module
 127  */
 128 static void appldata_work_fn(struct work_struct *work)
 129 {
 130         struct list_head *lh;
 131         struct appldata_ops *ops;
 132         int i;
 133
 134         P_DEBUG("  -= Work Queue =-\n");
 135         i = 0;
 136         spin_lock(&appldata_ops_lock);
 137         list_for_each(lh, &appldata_ops_list) {
 138                 ops = list_entry(lh, struct appldata_ops, list);
 139                 P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
 140                         ++i, ops->active, ops->name);
 141                 if (ops->active == 1) {
 142                         ops->callback(ops->data);
 143                 }
 144         }
 145         spin_unlock(&appldata_ops_lock);
 146 }
 147
 148 /*
 149  * appldata_diag()
 150  *
 151  * prepare parameter list, issue DIAG 0xDC
 152  */
 153 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 154                         u16 length, char *mod_lvl)
 155 {
 156         struct appldata_product_id id = {
 157                 .prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
 158                                0xE7, 0xD2, 0xD9},       /* "LINUXKR" */
 159                 .prod_fn    = 0xD5D3,                   /* "NL" */
 160                 .version_nr = 0xF2F6,                   /* "26" */
 161                 .release_nr = 0xF0F1,                   /* "01" */
 162         };
 163
 164         id.record_nr = record_nr;
 165         id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
 166         return appldata_asm(&id, function, (void *) buffer, length);
 167 }
 168 /************************ timer, work, DIAG <END> ****************************/
 169
 170
 171 /****************************** /proc stuff **********************************/
 172
 173 /*
 174  * appldata_mod_vtimer_wrap()
 175  *
 176  * wrapper function for mod_virt_timer(), because smp_call_function_on()
 177  * accepts only one parameter.
 178  */
 179 static void __appldata_mod_vtimer_wrap(void *p) {
 180         struct {
 181                 struct vtimer_list *timer;
 182                 u64    expires;
 183         } *args = p;
 184         mod_virt_timer(args->timer, args->expires);
 185 }
 186
 187 #define APPLDATA_ADD_TIMER      0
 188 #define APPLDATA_DEL_TIMER      1
 189 #define APPLDATA_MOD_TIMER      2
 190
 191 /*
 192  * __appldata_vtimer_setup()
 193  *
 194  * Add, delete or modify virtual timers on all online cpus.
 195  * The caller needs to get the appldata_timer_lock spinlock.
 196  */
 197 static void
 198 __appldata_vtimer_setup(int cmd)
 199 {
 200         u64 per_cpu_interval;
 201         int i;
 202
 203         switch (cmd) {
 204         case APPLDATA_ADD_TIMER:
 205                 if (appldata_timer_active)
 206                         break;
 207                 per_cpu_interval = (u64) (appldata_interval*1000 /
 208                                           num_online_cpus()) * TOD_MICRO;
 209                 for_each_online_cpu(i) {
 210                         per_cpu(appldata_timer, i).expires = per_cpu_interval;
 211                         smp_call_function_on(add_virt_timer_periodic,
 212                                              &per_cpu(appldata_timer, i),
 213                                              0, 1, i);
 214                 }
 215                 appldata_timer_active = 1;
 216                 P_INFO("Monitoring timer started.\n");
 217                 break;
 218         case APPLDATA_DEL_TIMER:
 219                 for_each_online_cpu(i)
 220                         del_virt_timer(&per_cpu(appldata_timer, i));
 221                 if (!appldata_timer_active)
 222                         break;
 223                 appldata_timer_active = 0;
 224                 atomic_set(&appldata_expire_count, num_online_cpus());
 225                 P_INFO("Monitoring timer stopped.\n");
 226                 break;
 227         case APPLDATA_MOD_TIMER:
 228                 per_cpu_interval = (u64) (appldata_interval*1000 /
 229                                           num_online_cpus()) * TOD_MICRO;
 230                 if (!appldata_timer_active)
 231                         break;
 232                 for_each_online_cpu(i) {
 233                         struct {
 234                                 struct vtimer_list *timer;
 235                                 u64    expires;
 236                         } args;
 237                         args.timer = &per_cpu(appldata_timer, i);
 238                         args.expires = per_cpu_interval;
 239                         smp_call_function_on(__appldata_mod_vtimer_wrap,
 240                                              &args, 0, 1, i);
 241                 }
 242         }
 243 }
 244
 245 /*
 246  * appldata_timer_handler()
 247  *
 248  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 249  */
 250 static int
 251 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
 252                            void __user *buffer, size_t *lenp, loff_t *ppos)
 253 {
 254         int len;
 255         char buf[2];
 256
 257         if (!*lenp || *ppos) {
 258                 *lenp = 0;
 259                 return 0;
 260         }
 261         if (!write) {
 262                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 263                 if (len > *lenp)
 264                         len = *lenp;
 265                 if (copy_to_user(buffer, buf, len))
 266                         return -EFAULT;
 267                 goto out;
 268         }
 269         len = *lenp;
 270         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 271                 return -EFAULT;
 272         spin_lock(&appldata_timer_lock);
 273         if (buf[0] == '1')
 274                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 275         else if (buf[0] == '0')
 276                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 277         spin_unlock(&appldata_timer_lock);
 278 out:
 279         *lenp = len;
 280         *ppos += len;
 281         return 0;
 282 }
 283
 284 /*
 285  * appldata_interval_handler()
 286  *
 287  * Set (CPU) timer interval for collection of data (in milliseconds), show
 288  * current timer interval.
 289  */
 290 static int
 291 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
 292                            void __user *buffer, size_t *lenp, loff_t *ppos)
 293 {
 294         int len, interval;
 295         char buf[16];
 296
 297         if (!*lenp || *ppos) {
 298                 *lenp = 0;
 299                 return 0;
 300         }
 301         if (!write) {
 302                 len = sprintf(buf, "%i\n", appldata_interval);
 303                 if (len > *lenp)
 304                         len = *lenp;
 305                 if (copy_to_user(buffer, buf, len))
 306                         return -EFAULT;
 307                 goto out;
 308         }
 309         len = *lenp;
 310         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
 311                 return -EFAULT;
 312         }
 313         interval = 0;
 314         sscanf(buf, "%i", &interval);
 315         if (interval <= 0) {
 316                 P_ERROR("Timer CPU interval has to be > 0!\n");
 317                 return -EINVAL;
 318         }
 319
 320         spin_lock(&appldata_timer_lock);
 321         appldata_interval = interval;
 322         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 323         spin_unlock(&appldata_timer_lock);
 324
 325         P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
 326                  interval);
 327 out:
 328         *lenp = len;
 329         *ppos += len;
 330         return 0;
 331 }
 332
 333 /*
 334  * appldata_generic_handler()
 335  *
 336  * Generic start/stop monitoring and DIAG, show status of
 337  * monitoring (0 = not in process, 1 = in process)
 338  */
 339 static int
 340 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
 341                            void __user *buffer, size_t *lenp, loff_t *ppos)
 342 {
 343         struct appldata_ops *ops = NULL, *tmp_ops;
 344         int rc, len, found;
 345         char buf[2];
 346         struct list_head *lh;
 347
 348         found = 0;
 349         spin_lock(&appldata_ops_lock);
 350         list_for_each(lh, &appldata_ops_list) {
 351                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 352                 if (&tmp_ops->ctl_table[2] == ctl) {
 353                         found = 1;
 354                 }
 355         }
 356         if (!found) {
 357                 spin_unlock(&appldata_ops_lock);
 358                 return -ENODEV;
 359         }
 360         ops = ctl->data;
 361         if (!try_module_get(ops->owner)) {      // protect this function
 362                 spin_unlock(&appldata_ops_lock);
 363                 return -ENODEV;
 364         }
 365         spin_unlock(&appldata_ops_lock);
 366
 367         if (!*lenp || *ppos) {
 368                 *lenp = 0;
 369                 module_put(ops->owner);
 370                 return 0;
 371         }
 372         if (!write) {
 373                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 374                 if (len > *lenp)
 375                         len = *lenp;
 376                 if (copy_to_user(buffer, buf, len)) {
 377                         module_put(ops->owner);
 378                         return -EFAULT;
 379                 }
 380                 goto out;
 381         }
 382         len = *lenp;
 383         if (copy_from_user(buf, buffer,
 384                            len > sizeof(buf) ? sizeof(buf) : len)) {
 385                 module_put(ops->owner);
 386                 return -EFAULT;
 387         }
 388
 389         spin_lock(&appldata_ops_lock);
 390         if ((buf[0] == '1') && (ops->active == 0)) {
 391                 // protect work queue callback
 392                 if (!try_module_get(ops->owner)) {
 393                         spin_unlock(&appldata_ops_lock);
 394                         module_put(ops->owner);
 395                         return -ENODEV;
 396                 }
 397                 ops->callback(ops->data);       // init record
 398                 rc = appldata_diag(ops->record_nr,
 399                                         APPLDATA_START_INTERVAL_REC,
 400                                         (unsigned long) ops->data, ops->size,
 401                                         ops->mod_lvl);
 402                 if (rc != 0) {
 403                         P_ERROR("START DIAG 0xDC for %s failed, "
 404                                 "return code: %d\n", ops->name, rc);
 405                         module_put(ops->owner);
 406                 } else {
 407                         P_INFO("Monitoring %s data enabled, "
 408                                 "DIAG 0xDC started.\n", ops->name);
 409                         ops->active = 1;
 410                 }
 411         } else if ((buf[0] == '0') && (ops->active == 1)) {
 412                 ops->active = 0;
 413                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 414                                 (unsigned long) ops->data, ops->size,
 415                                 ops->mod_lvl);
 416                 if (rc != 0) {
 417                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 418                                 "return code: %d\n", ops->name, rc);
 419                 } else {
 420                         P_INFO("Monitoring %s data disabled, "
 421                                 "DIAG 0xDC stopped.\n", ops->name);
 422                 }
 423                 module_put(ops->owner);
 424         }
 425         spin_unlock(&appldata_ops_lock);
 426 out:
 427         *lenp = len;
 428         *ppos += len;
 429         module_put(ops->owner);
 430         return 0;
 431 }
 432
 433 /*************************** /proc stuff <END> *******************************/
 434
 435
 436 /************************* module-ops management *****************************/
 437 /*
 438  * appldata_register_ops()
 439  *
 440  * update ops list, register /proc/sys entries
 441  */
 442 int appldata_register_ops(struct appldata_ops *ops)
 443 {
 444         struct list_head *lh;
 445         struct appldata_ops *tmp_ops;
 446         int i;
 447
 448         i = 0;
 449
 450         if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
 451                 (ops->size < 0)){
 452                 P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
 453                         ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
 454                 return -ENOMEM;
 455         }
 456         if ((ops->ctl_nr == CTL_APPLDATA) ||
 457             (ops->ctl_nr == CTL_APPLDATA_TIMER) ||
 458             (ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
 459                 P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
 460                 return -EBUSY;
 461         }
 462         ops->ctl_table = kzalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
 463         if (ops->ctl_table == NULL) {
 464                 P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
 465                 return -ENOMEM;
 466         }
 467
 468         spin_lock(&appldata_ops_lock);
 469         list_for_each(lh, &appldata_ops_list) {
 470                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 471                 P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
 472                         ++i, tmp_ops->name, tmp_ops->ctl_nr);
 473                 P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
 474                         tmp_ops->name, tmp_ops->ctl_nr, ops->name,
 475                         ops->ctl_nr);
 476                 if (strncmp(tmp_ops->name, ops->name,
 477                                 APPLDATA_PROC_NAME_LENGTH) == 0) {
 478                         P_ERROR("Name \"%s\" already registered!\n", ops->name);
 479                         kfree(ops->ctl_table);
 480                         spin_unlock(&appldata_ops_lock);
 481                         return -EBUSY;
 482                 }
 483                 if (tmp_ops->ctl_nr == ops->ctl_nr) {
 484                         P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
 485                         kfree(ops->ctl_table);
 486                         spin_unlock(&appldata_ops_lock);
 487                         return -EBUSY;
 488                 }
 489         }
 490         list_add(&ops->list, &appldata_ops_list);
 491         spin_unlock(&appldata_ops_lock);
 492
 493         ops->ctl_table[0].ctl_name = CTL_APPLDATA;
 494         ops->ctl_table[0].procname = appldata_proc_name;
 495         ops->ctl_table[0].maxlen   = 0;
 496         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 497         ops->ctl_table[0].child    = &ops->ctl_table[2];
 498
 499         ops->ctl_table[1].ctl_name = 0;
 500
 501         ops->ctl_table[2].ctl_name = ops->ctl_nr;
 502         ops->ctl_table[2].procname = ops->name;
 503         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 504         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 505         ops->ctl_table[2].data = ops;
 506
 507         ops->ctl_table[3].ctl_name = 0;
 508
 509         ops->sysctl_header = register_sysctl_table(ops->ctl_table);
 510
 511         P_INFO("%s-ops registered!\n", ops->name);
 512         return 0;
 513 }
 514
 515 /*
 516  * appldata_unregister_ops()
 517  *
 518  * update ops list, unregister /proc entries, stop DIAG if necessary
 519  */
 520 void appldata_unregister_ops(struct appldata_ops *ops)
 521 {
 522         void *table;
 523         spin_lock(&appldata_ops_lock);
 524         list_del(&ops->list);
 525         /* at that point any incoming access will fail */
 526         table = ops->ctl_table;
 527         ops->ctl_table = NULL;
 528         spin_unlock(&appldata_ops_lock);
 529         unregister_sysctl_table(ops->sysctl_header);
 530         kfree(table);
 531         P_INFO("%s-ops unregistered!\n", ops->name);
 532 }
 533 /********************** module-ops management <END> **************************/
 534
 535
 536 /******************************* init / exit *********************************/
 537
 538 static void __cpuinit appldata_online_cpu(int cpu)
 539 {
 540         init_virt_timer(&per_cpu(appldata_timer, cpu));
 541         per_cpu(appldata_timer, cpu).function = appldata_timer_function;
 542         per_cpu(appldata_timer, cpu).data = (unsigned long)
 543                 &appldata_work;
 544         atomic_inc(&appldata_expire_count);
 545         spin_lock(&appldata_timer_lock);
 546         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 547         spin_unlock(&appldata_timer_lock);
 548 }
 549
 550 static void
 551 appldata_offline_cpu(int cpu)
 552 {
 553         del_virt_timer(&per_cpu(appldata_timer, cpu));
 554         if (atomic_dec_and_test(&appldata_expire_count)) {
 555                 atomic_set(&appldata_expire_count, num_online_cpus());
 556                 queue_work(appldata_wq, &appldata_work);
 557         }
 558         spin_lock(&appldata_timer_lock);
 559         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 560         spin_unlock(&appldata_timer_lock);
 561 }
 562
 563 static int __cpuinit
 564 appldata_cpu_notify(struct notifier_block *self,
 565                     unsigned long action, void *hcpu)
 566 {
 567         switch (action) {
 568         case CPU_ONLINE:
 569         case CPU_ONLINE_FROZEN:
 570                 appldata_online_cpu((long) hcpu);
 571                 break;
 572         case CPU_DEAD:
 573         case CPU_DEAD_FROZEN:
 574                 appldata_offline_cpu((long) hcpu);
 575                 break;
 576         default:
 577                 break;
 578         }
 579         return NOTIFY_OK;
 580 }
 581
 582 static struct notifier_block __cpuinitdata appldata_nb = {
 583         .notifier_call = appldata_cpu_notify,
 584 };
 585
 586 /*
 587  * appldata_init()
 588  *
 589  * init timer, register /proc entries
 590  */
 591 static int __init appldata_init(void)
 592 {
 593         int i;
 594
 595         P_DEBUG("sizeof(parameter_list) = %lu\n",
 596                 sizeof(struct appldata_parameter_list));
 597
 598         appldata_wq = create_singlethread_workqueue("appldata");
 599         if (!appldata_wq) {
 600                 P_ERROR("Could not create work queue\n");
 601                 return -ENOMEM;
 602         }
 603
 604         for_each_online_cpu(i)
 605                 appldata_online_cpu(i);
 606
 607         /* Register cpu hotplug notifier */
 608         register_hotcpu_notifier(&appldata_nb);
 609
 610         appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
 611 #ifdef MODULE
 612         appldata_dir_table[0].de->owner = THIS_MODULE;
 613         appldata_table[0].de->owner = THIS_MODULE;
 614         appldata_table[1].de->owner = THIS_MODULE;
 615 #endif
 616
 617         P_DEBUG("Base interface initialized.\n");
 618         return 0;
 619 }
 620
 621 /*
 622  * appldata_exit()
 623  *
 624  * stop timer, unregister /proc entries
 625  */
 626 static void __exit appldata_exit(void)
 627 {
 628         struct list_head *lh;
 629         struct appldata_ops *ops;
 630         int rc, i;
 631
 632         P_DEBUG("Unloading module ...\n");
 633         /*
 634          * ops list should be empty, but just in case something went wrong...
 635          */
 636         spin_lock(&appldata_ops_lock);
 637         list_for_each(lh, &appldata_ops_list) {
 638                 ops = list_entry(lh, struct appldata_ops, list);
 639                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 640                                 (unsigned long) ops->data, ops->size,
 641                                 ops->mod_lvl);
 642                 if (rc != 0) {
 643                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 644                                 "return code: %d\n", ops->name, rc);
 645                 }
 646         }
 647         spin_unlock(&appldata_ops_lock);
 648
 649         for_each_online_cpu(i)
 650                 appldata_offline_cpu(i);
 651
 652         appldata_timer_active = 0;
 653
 654         unregister_sysctl_table(appldata_sysctl_header);
 655
 656         destroy_workqueue(appldata_wq);
 657         P_DEBUG("... module unloaded!\n");
 658 }
 659 /**************************** init / exit <END> ******************************/
 660
 661
 662 module_init(appldata_init);
 663 module_exit(appldata_exit);
 664 MODULE_LICENSE("GPL");
 665 MODULE_AUTHOR("Gerald Schaefer");
 666 MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
 667
 668 EXPORT_SYMBOL_GPL(appldata_register_ops);
 669 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 670 EXPORT_SYMBOL_GPL(appldata_diag);
 671
 672 EXPORT_SYMBOL_GPL(si_swapinfo);
 673 EXPORT_SYMBOL_GPL(nr_threads);
 674 EXPORT_SYMBOL_GPL(nr_running);
 675 EXPORT_SYMBOL_GPL(nr_iowait);