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 #define KMSG_COMPONENT  "appldata"
  13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel_stat.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/sched.h>
  22 #include <asm/appldata.h>
  23 #include <asm/smp.h>
  24
  25 #include "appldata.h"
  26
  27
  28 #define LOAD_INT(x) ((x) >> FSHIFT)
  29 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  30
  31 /*
  32  * OS data
  33  *
  34  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  35  * the structure version (product ID, see appldata_base.c) needs to be changed
  36  * as well and all documentation and z/VM applications using it must be
  37  * updated.
  38  *
  39  * The record layout is documented in the Linux for zSeries Device Drivers
  40  * book:
  41  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  42  */
  43 struct appldata_os_per_cpu {
  44         u32 per_cpu_user;       /* timer ticks spent in user mode   */
  45         u32 per_cpu_nice;       /* ... spent with modified priority */
  46         u32 per_cpu_system;     /* ... spent in kernel mode         */
  47         u32 per_cpu_idle;       /* ... spent in idle mode           */
  48
  49         /* New in 2.6 */
  50         u32 per_cpu_irq;        /* ... spent in interrupts          */
  51         u32 per_cpu_softirq;    /* ... spent in softirqs            */
  52         u32 per_cpu_iowait;     /* ... spent while waiting for I/O  */
  53
  54         /* New in modification level 01 */
  55         u32 per_cpu_steal;      /* ... stolen by hypervisor         */
  56         u32 cpu_id;             /* number of this CPU               */
  57 } __attribute__((packed));
  58
  59 struct appldata_os_data {
  60         u64 timestamp;
  61         u32 sync_count_1;       /* after VM collected the record data, */
  62         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  63                                    same. If not, the record has been updated on
  64                                    the Linux side while VM was collecting the
  65                                    (possibly corrupt) data */
  66
  67         u32 nr_cpus;            /* number of (virtual) CPUs        */
  68         u32 per_cpu_size;       /* size of the per-cpu data struct */
  69         u32 cpu_offset;         /* offset of the first per-cpu data struct */
  70
  71         u32 nr_running;         /* number of runnable threads      */
  72         u32 nr_threads;         /* number of threads               */
  73         u32 avenrun[3];         /* average nr. of running processes during */
  74                                 /* the last 1, 5 and 15 minutes */
  75
  76         /* New in 2.6 */
  77         u32 nr_iowait;          /* number of blocked threads
  78                                    (waiting for I/O)               */
  79
  80         /* per cpu data */
  81         struct appldata_os_per_cpu os_cpu[0];
  82 } __attribute__((packed));
  83
  84 static struct appldata_os_data *appldata_os_data;
  85
  86 static struct appldata_ops ops = {
  87         .name      = "os",
  88         .record_nr = APPLDATA_RECORD_OS_ID,
  89         .owner     = THIS_MODULE,
  90         .mod_lvl   = {0xF0, 0xF1},              /* EBCDIC "01" */
  91 };
  92
  93
  94 /*
  95  * appldata_get_os_data()
  96  *
  97  * gather OS data
  98  */
  99 static void appldata_get_os_data(void *data)
 100 {
 101         int i, j, rc;
 102         struct appldata_os_data *os_data;
 103         unsigned int new_size;
 104
 105         os_data = data;
 106         os_data->sync_count_1++;
 107
 108         os_data->nr_threads = nr_threads;
 109         os_data->nr_running = nr_running();
 110         os_data->nr_iowait  = nr_iowait();
 111         os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
 112         os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
 113         os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
 114
 115         j = 0;
 116         for_each_online_cpu(i) {
 117                 os_data->os_cpu[j].per_cpu_user =
 118                         cputime_to_jiffies(kstat_cpu(i).cpustat.user);
 119                 os_data->os_cpu[j].per_cpu_nice =
 120                         cputime_to_jiffies(kstat_cpu(i).cpustat.nice);
 121                 os_data->os_cpu[j].per_cpu_system =
 122                         cputime_to_jiffies(kstat_cpu(i).cpustat.system);
 123                 os_data->os_cpu[j].per_cpu_idle =
 124                         cputime_to_jiffies(kstat_cpu(i).cpustat.idle);
 125                 os_data->os_cpu[j].per_cpu_irq =
 126                         cputime_to_jiffies(kstat_cpu(i).cpustat.irq);
 127                 os_data->os_cpu[j].per_cpu_softirq =
 128                         cputime_to_jiffies(kstat_cpu(i).cpustat.softirq);
 129                 os_data->os_cpu[j].per_cpu_iowait =
 130                         cputime_to_jiffies(kstat_cpu(i).cpustat.iowait);
 131                 os_data->os_cpu[j].per_cpu_steal =
 132                         cputime_to_jiffies(kstat_cpu(i).cpustat.steal);
 133                 os_data->os_cpu[j].cpu_id = i;
 134                 j++;
 135         }
 136
 137         os_data->nr_cpus = j;
 138
 139         new_size = sizeof(struct appldata_os_data) +
 140                    (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));
 141         if (ops.size != new_size) {
 142                 if (ops.active) {
 143                         rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 144                                            APPLDATA_START_INTERVAL_REC,
 145                                            (unsigned long) ops.data, new_size,
 146                                            ops.mod_lvl);
 147                         if (rc != 0)
 148                                 pr_err("Starting a new OS data collection "
 149                                        "failed with rc=%d\n", rc);
 150
 151                         rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 152                                            APPLDATA_STOP_REC,
 153                                            (unsigned long) ops.data, ops.size,
 154                                            ops.mod_lvl);
 155                         if (rc != 0)
 156                                 pr_err("Stopping a faulty OS data "
 157                                        "collection failed with rc=%d\n", rc);
 158                 }
 159                 ops.size = new_size;
 160         }
 161         os_data->timestamp = get_clock();
 162         os_data->sync_count_2++;
 163 }
 164
 165
 166 /*
 167  * appldata_os_init()
 168  *
 169  * init data, register ops
 170  */
 171 static int __init appldata_os_init(void)
 172 {
 173         int rc, max_size;
 174
 175         max_size = sizeof(struct appldata_os_data) +
 176                    (NR_CPUS * sizeof(struct appldata_os_per_cpu));
 177         if (max_size > APPLDATA_MAX_REC_SIZE) {
 178                 pr_err("Maximum OS record size %i exceeds the maximum "
 179                        "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
 180                 rc = -ENOMEM;
 181                 goto out;
 182         }
 183
 184         appldata_os_data = kzalloc(max_size, GFP_DMA);
 185         if (appldata_os_data == NULL) {
 186                 rc = -ENOMEM;
 187                 goto out;
 188         }
 189
 190         appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
 191         appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
 192                                                         os_cpu);
 193
 194         ops.data = appldata_os_data;
 195         ops.callback  = &appldata_get_os_data;
 196         rc = appldata_register_ops(&ops);
 197         if (rc != 0)
 198                 kfree(appldata_os_data);
 199 out:
 200         return rc;
 201 }
 202
 203 /*
 204  * appldata_os_exit()
 205  *
 206  * unregister ops
 207  */
 208 static void __exit appldata_os_exit(void)
 209 {
 210         appldata_unregister_ops(&ops);
 211         kfree(appldata_os_data);
 212 }
 213
 214
 215 module_init(appldata_os_init);
 216 module_exit(appldata_os_exit);
 217
 218 MODULE_LICENSE("GPL");
 219 MODULE_AUTHOR("Gerald Schaefer");
 220 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");