arch/s390/appldata/appldata_os.c

   1 /*
   2  * arch/s390/appldata/appldata_os.c
   3  *
   4  * Data gathering module for Linux-VM Monitor Stream, Stage 1.
   5  * Collects misc. OS related data (CPU utilization, running processes).
   6  *
   7  * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
   8  *
   9  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/errno.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/sched.h>
  19 #include <asm/appldata.h>
  20 #include <asm/smp.h>
  21
  22 #include "appldata.h"
  23
  24
  25 #define MY_PRINT_NAME   "appldata_os"           /* for debug messages, etc. */
  26 #define LOAD_INT(x) ((x) >> FSHIFT)
  27 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  28
  29 /*
  30  * OS data
  31  *
  32  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  33  * the structure version (product ID, see appldata_base.c) needs to be changed
  34  * as well and all documentation and z/VM applications using it must be
  35  * updated.
  36  *
  37  * The record layout is documented in the Linux for zSeries Device Drivers
  38  * book:
  39  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  40  */
  41 struct appldata_os_per_cpu {
  42         u32 per_cpu_user;       /* timer ticks spent in user mode   */
  43         u32 per_cpu_nice;       /* ... spent with modified priority */
  44         u32 per_cpu_system;     /* ... spent in kernel mode         */
  45         u32 per_cpu_idle;       /* ... spent in idle mode           */
  46
  47         /* New in 2.6 */
  48         u32 per_cpu_irq;        /* ... spent in interrupts          */
  49         u32 per_cpu_softirq;    /* ... spent in softirqs            */
  50         u32 per_cpu_iowait;     /* ... spent while waiting for I/O  */
  51
  52         /* New in modification level 01 */
  53         u32 per_cpu_steal;      /* ... stolen by hypervisor         */
  54         u32 cpu_id;             /* number of this CPU               */
  55 } __attribute__((packed));
  56
  57 struct appldata_os_data {
  58         u64 timestamp;
  59         u32 sync_count_1;       /* after VM collected the record data, */
  60         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  61                                    same. If not, the record has been updated on
  62                                    the Linux side while VM was collecting the
  63                                    (possibly corrupt) data */
  64
  65         u32 nr_cpus;            /* number of (virtual) CPUs        */
  66         u32 per_cpu_size;       /* size of the per-cpu data struct */
  67         u32 cpu_offset;         /* offset of the first per-cpu data struct */
  68
  69         u32 nr_running;         /* number of runnable threads      */
  70         u32 nr_threads;         /* number of threads               */
  71         u32 avenrun[3];         /* average nr. of running processes during */
  72                                 /* the last 1, 5 and 15 minutes */
  73
  74         /* New in 2.6 */
  75         u32 nr_iowait;          /* number of blocked threads
  76                                    (waiting for I/O)               */
  77
  78         /* per cpu data */
  79         struct appldata_os_per_cpu os_cpu[0];
  80 } __attribute__((packed));
  81
  82 static struct appldata_os_data *appldata_os_data;
  83
  84 static struct appldata_ops ops = {
  85         .name      = "os",
  86         .record_nr = APPLDATA_RECORD_OS_ID,
  87         .owner     = THIS_MODULE,
  88         .mod_lvl   = {0xF0, 0xF1},              /* EBCDIC "01" */
  89 };
  90
  91
  92 static inline void appldata_print_debug(struct appldata_os_data *os_data)
  93 {
  94         int a0, a1, a2, i;
  95
  96         P_DEBUG("--- OS - RECORD ---\n");
  97         P_DEBUG("nr_threads   = %u\n", os_data->nr_threads);
  98         P_DEBUG("nr_running   = %u\n", os_data->nr_running);
  99         P_DEBUG("nr_iowait    = %u\n", os_data->nr_iowait);
 100         P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0],
 101                 os_data->avenrun[1], os_data->avenrun[2]);
 102         a0 = os_data->avenrun[0];
 103         a1 = os_data->avenrun[1];
 104         a2 = os_data->avenrun[2];
 105         P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n",
 106                 LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1),
 107                 LOAD_INT(a2), LOAD_FRAC(a2));
 108
 109         P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus);
 110         for (i = 0; i < os_data->nr_cpus; i++) {
 111                 P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, "
 112                         "idle = %u, irq = %u, softirq = %u, iowait = %u, "
 113                         "steal = %u\n",
 114                                 os_data->os_cpu[i].cpu_id,
 115                                 os_data->os_cpu[i].per_cpu_user,
 116                                 os_data->os_cpu[i].per_cpu_nice,
 117                                 os_data->os_cpu[i].per_cpu_system,
 118                                 os_data->os_cpu[i].per_cpu_idle,
 119                                 os_data->os_cpu[i].per_cpu_irq,
 120                                 os_data->os_cpu[i].per_cpu_softirq,
 121                                 os_data->os_cpu[i].per_cpu_iowait,
 122                                 os_data->os_cpu[i].per_cpu_steal);
 123         }
 124
 125         P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1);
 126         P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2);
 127         P_DEBUG("timestamp    = %lX\n", os_data->timestamp);
 128 }
 129
 130 /*
 131  * appldata_get_os_data()
 132  *
 133  * gather OS data
 134  */
 135 static void appldata_get_os_data(void *data)
 136 {
 137         int i, j, rc;
 138         struct appldata_os_data *os_data;
 139         unsigned int new_size;
 140
 141         os_data = data;
 142         os_data->sync_count_1++;
 143
 144         os_data->nr_threads = nr_threads;
 145         os_data->nr_running = nr_running();
 146         os_data->nr_iowait  = nr_iowait();
 147         os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
 148         os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
 149         os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
 150
 151         j = 0;
 152         for_each_online_cpu(i) {
 153                 os_data->os_cpu[j].per_cpu_user =
 154                         cputime_to_jiffies(kstat_cpu(i).cpustat.user);
 155                 os_data->os_cpu[j].per_cpu_nice =
 156                         cputime_to_jiffies(kstat_cpu(i).cpustat.nice);
 157                 os_data->os_cpu[j].per_cpu_system =
 158                         cputime_to_jiffies(kstat_cpu(i).cpustat.system);
 159                 os_data->os_cpu[j].per_cpu_idle =
 160                         cputime_to_jiffies(kstat_cpu(i).cpustat.idle);
 161                 os_data->os_cpu[j].per_cpu_irq =
 162                         cputime_to_jiffies(kstat_cpu(i).cpustat.irq);
 163                 os_data->os_cpu[j].per_cpu_softirq =
 164                         cputime_to_jiffies(kstat_cpu(i).cpustat.softirq);
 165                 os_data->os_cpu[j].per_cpu_iowait =
 166                         cputime_to_jiffies(kstat_cpu(i).cpustat.iowait);
 167                 os_data->os_cpu[j].per_cpu_steal =
 168                         cputime_to_jiffies(kstat_cpu(i).cpustat.steal);
 169                 os_data->os_cpu[j].cpu_id = i;
 170                 j++;
 171         }
 172
 173         os_data->nr_cpus = j;
 174
 175         new_size = sizeof(struct appldata_os_data) +
 176                    (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));
 177         if (ops.size != new_size) {
 178                 if (ops.active) {
 179                         rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 180                                            APPLDATA_START_INTERVAL_REC,
 181                                            (unsigned long) ops.data, new_size,
 182                                            ops.mod_lvl);
 183                         if (rc != 0) {
 184                                 P_ERROR("os: START NEW DIAG 0xDC failed, "
 185                                         "return code: %d, new size = %i\n", rc,
 186                                         new_size);
 187                                 P_INFO("os: stopping old record now\n");
 188                         } else
 189                                 P_INFO("os: new record size = %i\n", new_size);
 190
 191                         rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 192                                            APPLDATA_STOP_REC,
 193                                            (unsigned long) ops.data, ops.size,
 194                                            ops.mod_lvl);
 195                         if (rc != 0)
 196                                 P_ERROR("os: STOP OLD DIAG 0xDC failed, "
 197                                         "return code: %d, old size = %i\n", rc,
 198                                         ops.size);
 199                         else
 200                                 P_INFO("os: old record size = %i stopped\n",
 201                                         ops.size);
 202                 }
 203                 ops.size = new_size;
 204         }
 205         os_data->timestamp = get_clock();
 206         os_data->sync_count_2++;
 207 #ifdef APPLDATA_DEBUG
 208         appldata_print_debug(os_data);
 209 #endif
 210 }
 211
 212
 213 /*
 214  * appldata_os_init()
 215  *
 216  * init data, register ops
 217  */
 218 static int __init appldata_os_init(void)
 219 {
 220         int rc, max_size;
 221
 222         max_size = sizeof(struct appldata_os_data) +
 223                    (NR_CPUS * sizeof(struct appldata_os_per_cpu));
 224         if (max_size > APPLDATA_MAX_REC_SIZE) {
 225                 P_ERROR("Max. size of OS record = %i, bigger than maximum "
 226                         "record size (%i)\n", max_size, APPLDATA_MAX_REC_SIZE);
 227                 rc = -ENOMEM;
 228                 goto out;
 229         }
 230         P_DEBUG("max. sizeof(os) = %i, sizeof(os_cpu) = %lu\n", max_size,
 231                 sizeof(struct appldata_os_per_cpu));
 232
 233         appldata_os_data = kzalloc(max_size, GFP_DMA);
 234         if (appldata_os_data == NULL) {
 235                 P_ERROR("No memory for %s!\n", ops.name);
 236                 rc = -ENOMEM;
 237                 goto out;
 238         }
 239
 240         appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
 241         appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
 242                                                         os_cpu);
 243         P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset);
 244
 245         ops.data = appldata_os_data;
 246         ops.callback  = &appldata_get_os_data;
 247         rc = appldata_register_ops(&ops);
 248         if (rc != 0) {
 249                 P_ERROR("Error registering ops, rc = %i\n", rc);
 250                 kfree(appldata_os_data);
 251         } else {
 252                 P_DEBUG("%s-ops registered!\n", ops.name);
 253         }
 254 out:
 255         return rc;
 256 }
 257
 258 /*
 259  * appldata_os_exit()
 260  *
 261  * unregister ops
 262  */
 263 static void __exit appldata_os_exit(void)
 264 {
 265         appldata_unregister_ops(&ops);
 266         kfree(appldata_os_data);
 267         P_DEBUG("%s-ops unregistered!\n", ops.name);
 268 }
 269
 270
 271 module_init(appldata_os_init);
 272 module_exit(appldata_os_exit);
 273
 274 MODULE_LICENSE("GPL");
 275 MODULE_AUTHOR("Gerald Schaefer");
 276 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");