linux/arch/s390/appldata/appldata_os.c
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   1/*
   2 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
   3 * Collects misc. OS related data (CPU utilization, running processes).
   4 *
   5 * Copyright IBM Corp. 2003, 2006
   6 *
   7 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
   8 */
   9
  10#define KMSG_COMPONENT  "appldata"
  11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  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/appldata.h>
  21#include <asm/smp.h>
  22
  23#include "appldata.h"
  24
  25
  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 */
  41struct 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
  57struct 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
  82static struct appldata_os_data *appldata_os_data;
  83
  84static 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/*
  93 * appldata_get_os_data()
  94 *
  95 * gather OS data
  96 */
  97static void appldata_get_os_data(void *data)
  98{
  99        int i, j, rc;
 100        struct appldata_os_data *os_data;
 101        unsigned int new_size;
 102
 103        os_data = data;
 104        os_data->sync_count_1++;
 105
 106        os_data->nr_threads = nr_threads;
 107        os_data->nr_running = nr_running();
 108        os_data->nr_iowait  = nr_iowait();
 109        os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
 110        os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
 111        os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
 112
 113        j = 0;
 114        for_each_online_cpu(i) {
 115                os_data->os_cpu[j].per_cpu_user =
 116                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]);
 117                os_data->os_cpu[j].per_cpu_nice =
 118                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]);
 119                os_data->os_cpu[j].per_cpu_system =
 120                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]);
 121                os_data->os_cpu[j].per_cpu_idle =
 122                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]);
 123                os_data->os_cpu[j].per_cpu_irq =
 124                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]);
 125                os_data->os_cpu[j].per_cpu_softirq =
 126                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]);
 127                os_data->os_cpu[j].per_cpu_iowait =
 128                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]);
 129                os_data->os_cpu[j].per_cpu_steal =
 130                        cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]);
 131                os_data->os_cpu[j].cpu_id = i;
 132                j++;
 133        }
 134
 135        os_data->nr_cpus = j;
 136
 137        new_size = sizeof(struct appldata_os_data) +
 138                   (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));
 139        if (ops.size != new_size) {
 140                if (ops.active) {
 141                        rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 142                                           APPLDATA_START_INTERVAL_REC,
 143                                           (unsigned long) ops.data, new_size,
 144                                           ops.mod_lvl);
 145                        if (rc != 0)
 146                                pr_err("Starting a new OS data collection "
 147                                       "failed with rc=%d\n", rc);
 148
 149                        rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 150                                           APPLDATA_STOP_REC,
 151                                           (unsigned long) ops.data, ops.size,
 152                                           ops.mod_lvl);
 153                        if (rc != 0)
 154                                pr_err("Stopping a faulty OS data "
 155                                       "collection failed with rc=%d\n", rc);
 156                }
 157                ops.size = new_size;
 158        }
 159        os_data->timestamp = get_tod_clock();
 160        os_data->sync_count_2++;
 161}
 162
 163
 164/*
 165 * appldata_os_init()
 166 *
 167 * init data, register ops
 168 */
 169static int __init appldata_os_init(void)
 170{
 171        int rc, max_size;
 172
 173        max_size = sizeof(struct appldata_os_data) +
 174                   (num_possible_cpus() * sizeof(struct appldata_os_per_cpu));
 175        if (max_size > APPLDATA_MAX_REC_SIZE) {
 176                pr_err("Maximum OS record size %i exceeds the maximum "
 177                       "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
 178                rc = -ENOMEM;
 179                goto out;
 180        }
 181
 182        appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA);
 183        if (appldata_os_data == NULL) {
 184                rc = -ENOMEM;
 185                goto out;
 186        }
 187
 188        appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
 189        appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
 190                                                        os_cpu);
 191
 192        ops.data = appldata_os_data;
 193        ops.callback  = &appldata_get_os_data;
 194        rc = appldata_register_ops(&ops);
 195        if (rc != 0)
 196                kfree(appldata_os_data);
 197out:
 198        return rc;
 199}
 200
 201/*
 202 * appldata_os_exit()
 203 *
 204 * unregister ops
 205 */
 206static void __exit appldata_os_exit(void)
 207{
 208        appldata_unregister_ops(&ops);
 209        kfree(appldata_os_data);
 210}
 211
 212
 213module_init(appldata_os_init);
 214module_exit(appldata_os_exit);
 215
 216MODULE_LICENSE("GPL");
 217MODULE_AUTHOR("Gerald Schaefer");
 218MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");
 219