root/arch/s390/appldata/appldata_os.c

DEFINITIONS

1. appldata_get_os_data
2. appldata_os_init
3. appldata_os_exit

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