arch/s390/appldata/appldata_os.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Data gathering module for Linux-VM Monitor Stream, Stage 1.
   4  * Collects misc. OS related data (CPU utilization, running processes).
   5  *
   6  * Copyright IBM Corp. 2003, 2006
   7  *
   8  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
   9  */
  10
  11 #define KMSG_COMPONENT  "appldata"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/errno.h>
  18 #include <linux/kernel_stat.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/sched.h>
  21 #include <linux/sched/loadavg.h>
  22 #include <linux/sched/stat.h>
  23 #include <asm/appldata.h>
  24 #include <asm/smp.h>
  25
  26 #include "appldata.h"
  27
  28 /*
  29  * OS data
  30  *
  31  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  32  * the structure version (product ID, see appldata_base.c) needs to be changed
  33  * as well and all documentation and z/VM applications using it must be
  34  * updated.
  35  */
  36 struct appldata_os_per_cpu {
  37         u32 per_cpu_user;       /* timer ticks spent in user mode   */
  38         u32 per_cpu_nice;       /* ... spent with modified priority */
  39         u32 per_cpu_system;     /* ... spent in kernel mode         */
  40         u32 per_cpu_idle;       /* ... spent in idle mode           */
  41
  42         /* New in 2.6 */
  43         u32 per_cpu_irq;        /* ... spent in interrupts          */
  44         u32 per_cpu_softirq;    /* ... spent in softirqs            */
  45         u32 per_cpu_iowait;     /* ... spent while waiting for I/O  */
  46
  47         /* New in modification level 01 */
  48         u32 per_cpu_steal;      /* ... stolen by hypervisor         */
  49         u32 cpu_id;             /* number of this CPU               */
  50 } __attribute__((packed));
  51
  52 struct appldata_os_data {
  53         u64 timestamp;
  54         u32 sync_count_1;       /* after VM collected the record data, */
  55         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  56                                    same. If not, the record has been updated on
  57                                    the Linux side while VM was collecting the
  58                                    (possibly corrupt) data */
  59
  60         u32 nr_cpus;            /* number of (virtual) CPUs        */
  61         u32 per_cpu_size;       /* size of the per-cpu data struct */
  62         u32 cpu_offset;         /* offset of the first per-cpu data struct */
  63
  64         u32 nr_running;         /* number of runnable threads      */
  65         u32 nr_threads;         /* number of threads               */
  66         u32 avenrun[3];         /* average nr. of running processes during */
  67                                 /* the last 1, 5 and 15 minutes */
  68
  69         /* New in 2.6 */
  70         u32 nr_iowait;          /* number of blocked threads
  71                                    (waiting for I/O)               */
  72
  73         /* per cpu data */
  74         struct appldata_os_per_cpu os_cpu[];
  75 } __attribute__((packed));
  76
  77 static struct appldata_os_data *appldata_os_data;
  78
  79 static struct appldata_ops ops = {
  80         .name      = "os",
  81         .record_nr = APPLDATA_RECORD_OS_ID,
  82         .owner     = THIS_MODULE,
  83         .mod_lvl   = {0xF0, 0xF1},              /* EBCDIC "01" */
  84 };
  85
  86
  87 /*
  88  * appldata_get_os_data()
  89  *
  90  * gather OS data
  91  */
  92 static void appldata_get_os_data(void *data)
  93 {
  94         int i, j, rc;
  95         struct appldata_os_data *os_data;
  96         unsigned int new_size;
  97
  98         os_data = data;
  99         os_data->sync_count_1++;
 100
 101         os_data->nr_threads = nr_threads;
 102         os_data->nr_running = nr_running();
 103         os_data->nr_iowait  = nr_iowait();
 104         os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
 105         os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
 106         os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
 107
 108         j = 0;
 109         for_each_online_cpu(i) {
 110                 os_data->os_cpu[j].per_cpu_user =
 111                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]);
 112                 os_data->os_cpu[j].per_cpu_nice =
 113                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]);
 114                 os_data->os_cpu[j].per_cpu_system =
 115                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]);
 116                 os_data->os_cpu[j].per_cpu_idle =
 117                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]);
 118                 os_data->os_cpu[j].per_cpu_irq =
 119                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]);
 120                 os_data->os_cpu[j].per_cpu_softirq =
 121                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]);
 122                 os_data->os_cpu[j].per_cpu_iowait =
 123                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]);
 124                 os_data->os_cpu[j].per_cpu_steal =
 125                         nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]);
 126                 os_data->os_cpu[j].cpu_id = i;
 127                 j++;
 128         }
 129
 130         os_data->nr_cpus = j;
 131
 132         new_size = struct_size(os_data, os_cpu, os_data->nr_cpus);
 133         if (ops.size != new_size) {
 134                 if (ops.active) {
 135                         rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 136                                            APPLDATA_START_INTERVAL_REC,
 137                                            (unsigned long) ops.data, new_size,
 138                                            ops.mod_lvl);
 139                         if (rc != 0)
 140                                 pr_err("Starting a new OS data collection "
 141                                        "failed with rc=%d\n", rc);
 142
 143                         rc = appldata_diag(APPLDATA_RECORD_OS_ID,
 144                                            APPLDATA_STOP_REC,
 145                                            (unsigned long) ops.data, ops.size,
 146                                            ops.mod_lvl);
 147                         if (rc != 0)
 148                                 pr_err("Stopping a faulty OS data "
 149                                        "collection failed with rc=%d\n", rc);
 150                 }
 151                 ops.size = new_size;
 152         }
 153         os_data->timestamp = get_tod_clock();
 154         os_data->sync_count_2++;
 155 }
 156
 157
 158 /*
 159  * appldata_os_init()
 160  *
 161  * init data, register ops
 162  */
 163 static int __init appldata_os_init(void)
 164 {
 165         int rc, max_size;
 166
 167         max_size = struct_size(appldata_os_data, os_cpu, num_possible_cpus());
 168         if (max_size > APPLDATA_MAX_REC_SIZE) {
 169                 pr_err("Maximum OS record size %i exceeds the maximum "
 170                        "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
 171                 rc = -ENOMEM;
 172                 goto out;
 173         }
 174
 175         appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA);
 176         if (appldata_os_data == NULL) {
 177                 rc = -ENOMEM;
 178                 goto out;
 179         }
 180
 181         appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
 182         appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
 183                                                         os_cpu);
 184
 185         ops.data = appldata_os_data;
 186         ops.callback  = &appldata_get_os_data;
 187         rc = appldata_register_ops(&ops);
 188         if (rc != 0)
 189                 kfree(appldata_os_data);
 190 out:
 191         return rc;
 192 }
 193
 194 /*
 195  * appldata_os_exit()
 196  *
 197  * unregister ops
 198  */
 199 static void __exit appldata_os_exit(void)
 200 {
 201         appldata_unregister_ops(&ops);
 202         kfree(appldata_os_data);
 203 }
 204
 205
 206 module_init(appldata_os_init);
 207 module_exit(appldata_os_exit);
 208
 209 MODULE_LICENSE("GPL");
 210 MODULE_AUTHOR("Gerald Schaefer");
 211 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");