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 IBM Corporation, IBM Deutschland Entwicklung GmbH.
   8  *
   9  * Author: Gerald Schaefer <geraldsc@de.ibm.com>
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/errno.h>
  17 #include <linux/kernel_stat.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/sched.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 // <-- New in 2.6
  52 };
  53
  54 struct appldata_os_data {
  55         u64 timestamp;
  56         u32 sync_count_1;       /* after VM collected the record data, */
  57         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  58                                    same. If not, the record has been updated on
  59                                    the Linux side while VM was collecting the
  60                                    (possibly corrupt) data */
  61
  62         u32 nr_cpus;            /* number of (virtual) CPUs        */
  63         u32 per_cpu_size;       /* size of the per-cpu data struct */
  64         u32 cpu_offset;         /* offset of the first per-cpu data struct */
  65
  66         u32 nr_running;         /* number of runnable threads      */
  67         u32 nr_threads;         /* number of threads               */
  68         u32 avenrun[3];         /* average nr. of running processes during */
  69                                 /* the last 1, 5 and 15 minutes */
  70
  71 // New in 2.6 -->
  72         u32 nr_iowait;          /* number of blocked threads
  73                                    (waiting for I/O)               */
  74 // <-- New in 2.6
  75
  76         /* per cpu data */
  77         struct appldata_os_per_cpu os_cpu[0];
  78 };
  79
  80 static struct appldata_os_data *appldata_os_data;
  81
  82
  83 static inline void appldata_print_debug(struct appldata_os_data *os_data)
  84 {
  85         int a0, a1, a2, i;
  86
  87         P_DEBUG("--- OS - RECORD ---\n");
  88         P_DEBUG("nr_threads   = %u\n", os_data->nr_threads);
  89         P_DEBUG("nr_running   = %u\n", os_data->nr_running);
  90         P_DEBUG("nr_iowait    = %u\n", os_data->nr_iowait);
  91         P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0],
  92                 os_data->avenrun[1], os_data->avenrun[2]);
  93         a0 = os_data->avenrun[0];
  94         a1 = os_data->avenrun[1];
  95         a2 = os_data->avenrun[2];
  96         P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n",
  97                 LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1),
  98                 LOAD_INT(a2), LOAD_FRAC(a2));
  99
 100         P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus);
 101         for (i = 0; i < os_data->nr_cpus; i++) {
 102                 P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, "
 103                         "idle = %u, irq = %u, softirq = %u, iowait = %u\n",
 104                                 i,
 105                                 os_data->os_cpu[i].per_cpu_user,
 106                                 os_data->os_cpu[i].per_cpu_nice,
 107                                 os_data->os_cpu[i].per_cpu_system,
 108                                 os_data->os_cpu[i].per_cpu_idle,
 109                                 os_data->os_cpu[i].per_cpu_irq,
 110                                 os_data->os_cpu[i].per_cpu_softirq,
 111                                 os_data->os_cpu[i].per_cpu_iowait);
 112         }
 113
 114         P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1);
 115         P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2);
 116         P_DEBUG("timestamp    = %lX\n", os_data->timestamp);
 117 }
 118
 119 /*
 120  * appldata_get_os_data()
 121  *
 122  * gather OS data
 123  */
 124 static void appldata_get_os_data(void *data)
 125 {
 126         int i, j;
 127         struct appldata_os_data *os_data;
 128
 129         os_data = data;
 130         os_data->sync_count_1++;
 131
 132         os_data->nr_cpus = num_online_cpus();
 133
 134         os_data->nr_threads = nr_threads;
 135         os_data->nr_running = nr_running();
 136         os_data->nr_iowait  = nr_iowait();
 137         os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
 138         os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
 139         os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
 140
 141         j = 0;
 142         for_each_online_cpu(i) {
 143                 os_data->os_cpu[j].per_cpu_user =
 144                                         kstat_cpu(i).cpustat.user;
 145                 os_data->os_cpu[j].per_cpu_nice =
 146                                         kstat_cpu(i).cpustat.nice;
 147                 os_data->os_cpu[j].per_cpu_system =
 148                                         kstat_cpu(i).cpustat.system;
 149                 os_data->os_cpu[j].per_cpu_idle =
 150                                         kstat_cpu(i).cpustat.idle;
 151                 os_data->os_cpu[j].per_cpu_irq =
 152                                         kstat_cpu(i).cpustat.irq;
 153                 os_data->os_cpu[j].per_cpu_softirq =
 154                                         kstat_cpu(i).cpustat.softirq;
 155                 os_data->os_cpu[j].per_cpu_iowait =
 156                                         kstat_cpu(i).cpustat.iowait;
 157                 j++;
 158         }
 159
 160         os_data->timestamp = get_clock();
 161         os_data->sync_count_2++;
 162 #ifdef APPLDATA_DEBUG
 163         appldata_print_debug(os_data);
 164 #endif
 165 }
 166
 167
 168 static struct appldata_ops ops = {
 169         .ctl_nr    = CTL_APPLDATA_OS,
 170         .name      = "os",
 171         .record_nr = APPLDATA_RECORD_OS_ID,
 172         .callback  = &appldata_get_os_data,
 173         .owner     = THIS_MODULE,
 174 };
 175
 176
 177 /*
 178  * appldata_os_init()
 179  *
 180  * init data, register ops
 181  */
 182 static int __init appldata_os_init(void)
 183 {
 184         int rc, size;
 185
 186         size = sizeof(struct appldata_os_data) +
 187                 (NR_CPUS * sizeof(struct appldata_os_per_cpu));
 188         if (size > APPLDATA_MAX_REC_SIZE) {
 189                 P_ERROR("Size of record = %i, bigger than maximum (%i)!\n",
 190                         size, APPLDATA_MAX_REC_SIZE);
 191                 rc = -ENOMEM;
 192                 goto out;
 193         }
 194         P_DEBUG("sizeof(os) = %i, sizeof(os_cpu) = %lu\n", size,
 195                 sizeof(struct appldata_os_per_cpu));
 196
 197         appldata_os_data = kmalloc(size, GFP_DMA);
 198         if (appldata_os_data == NULL) {
 199                 P_ERROR("No memory for %s!\n", ops.name);
 200                 rc = -ENOMEM;
 201                 goto out;
 202         }
 203         memset(appldata_os_data, 0, size);
 204
 205         appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
 206         appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
 207                                                         os_cpu);
 208         P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset);
 209
 210         ops.data = appldata_os_data;
 211         ops.size = size;
 212         rc = appldata_register_ops(&ops);
 213         if (rc != 0) {
 214                 P_ERROR("Error registering ops, rc = %i\n", rc);
 215                 kfree(appldata_os_data);
 216         } else {
 217                 P_DEBUG("%s-ops registered!\n", ops.name);
 218         }
 219 out:
 220         return rc;
 221 }
 222
 223 /*
 224  * appldata_os_exit()
 225  *
 226  * unregister ops
 227  */
 228 static void __exit appldata_os_exit(void)
 229 {
 230         appldata_unregister_ops(&ops);
 231         kfree(appldata_os_data);
 232         P_DEBUG("%s-ops unregistered!\n", ops.name);
 233 }
 234
 235
 236 module_init(appldata_os_init);
 237 module_exit(appldata_os_exit);
 238
 239 MODULE_LICENSE("GPL");
 240 MODULE_AUTHOR("Gerald Schaefer");
 241 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");