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