arch/s390/appldata/appldata_os.c

   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  */
  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 /*
  93  * appldata_get_os_data()
  94  *
  95  * gather OS data
  96  */
  97 static 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  */
 169 static int __init appldata_os_init(void)
 170 {
 171         int rc, max_size;
 172
 173         max_size = sizeof(struct appldata_os_data) +
 174                    (NR_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);
 197 out:
 198         return rc;
 199 }
 200
 201 /*
 202  * appldata_os_exit()
 203  *
 204  * unregister ops
 205  */
 206 static void __exit appldata_os_exit(void)
 207 {
 208         appldata_unregister_ops(&ops);
 209         kfree(appldata_os_data);
 210 }
 211
 212
 213 module_init(appldata_os_init);
 214 module_exit(appldata_os_exit);
 215
 216 MODULE_LICENSE("GPL");
 217 MODULE_AUTHOR("Gerald Schaefer");
 218 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");