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