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appldata_os.c

/*
 * arch/s390/appldata/appldata_os.c
 *
 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
 * Collects misc. OS related data (CPU utilization, running processes).
 *
 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/netdevice.h>
#include <linux/sched.h>
#include <asm/appldata.h>
#include <asm/smp.h>

#include "appldata.h"


#define MY_PRINT_NAME   "appldata_os"           /* for debug messages, etc. */
#define LOAD_INT(x) ((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)

/*
 * OS data
 *
 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 * the structure version (product ID, see appldata_base.c) needs to be changed
 * as well and all documentation and z/VM applications using it must be
 * updated.
 *
 * The record layout is documented in the Linux for zSeries Device Drivers
 * book:
 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
 */
struct appldata_os_per_cpu {
      u32 per_cpu_user; /* timer ticks spent in user mode   */
      u32 per_cpu_nice; /* ... spent with modified priority */
      u32 per_cpu_system;     /* ... spent in kernel mode         */
      u32 per_cpu_idle; /* ... spent in idle mode           */

      /* New in 2.6 */
      u32 per_cpu_irq;  /* ... spent in interrupts          */
      u32 per_cpu_softirq;    /* ... spent in softirqs            */
      u32 per_cpu_iowait;     /* ... spent while waiting for I/O  */

      /* New in modification level 01 */
      u32 per_cpu_steal;      /* ... stolen by hypervisor       */
      u32 cpu_id;       /* number of this CPU             */
} __attribute__((packed));

struct appldata_os_data {
      u64 timestamp;
      u32 sync_count_1; /* after VM collected the record data, */
      u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
                           same. If not, the record has been updated on
                           the Linux side while VM was collecting the
                           (possibly corrupt) data */

      u32 nr_cpus;            /* number of (virtual) CPUs        */
      u32 per_cpu_size; /* size of the per-cpu data struct */
      u32 cpu_offset;         /* offset of the first per-cpu data struct */

      u32 nr_running;         /* number of runnable threads      */
      u32 nr_threads;         /* number of threads               */
      u32 avenrun[3];         /* average nr. of running processes during */
                        /* the last 1, 5 and 15 minutes */

      /* New in 2.6 */
      u32 nr_iowait;          /* number of blocked threads
                           (waiting for I/O)               */

      /* per cpu data */
      struct appldata_os_per_cpu os_cpu[0];
} __attribute__((packed));

static struct appldata_os_data *appldata_os_data;

static struct appldata_ops ops = {
      .name    = "os",
      .record_nr = APPLDATA_RECORD_OS_ID,
      .owner         = THIS_MODULE,
      .mod_lvl   = {0xF0, 0xF1},          /* EBCDIC "01" */
};


/*
 * appldata_get_os_data()
 *
 * gather OS data
 */
static void appldata_get_os_data(void *data)
{
      int i, j, rc;
      struct appldata_os_data *os_data;
      unsigned int new_size;

      os_data = data;
      os_data->sync_count_1++;

      os_data->nr_threads = nr_threads;
      os_data->nr_running = nr_running();
      os_data->nr_iowait  = nr_iowait();
      os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
      os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
      os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);

      j = 0;
      for_each_online_cpu(i) {
            os_data->os_cpu[j].per_cpu_user =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.user);
            os_data->os_cpu[j].per_cpu_nice =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.nice);
            os_data->os_cpu[j].per_cpu_system =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.system);
            os_data->os_cpu[j].per_cpu_idle =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.idle);
            os_data->os_cpu[j].per_cpu_irq =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.irq);
            os_data->os_cpu[j].per_cpu_softirq =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.softirq);
            os_data->os_cpu[j].per_cpu_iowait =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.iowait);
            os_data->os_cpu[j].per_cpu_steal =
                  cputime_to_jiffies(kstat_cpu(i).cpustat.steal);
            os_data->os_cpu[j].cpu_id = i;
            j++;
      }

      os_data->nr_cpus = j;

      new_size = sizeof(struct appldata_os_data) +
               (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));
      if (ops.size != new_size) {
            if (ops.active) {
                  rc = appldata_diag(APPLDATA_RECORD_OS_ID,
                                 APPLDATA_START_INTERVAL_REC,
                                 (unsigned long) ops.data, new_size,
                                 ops.mod_lvl);
                  if (rc != 0)
                        P_ERROR("os: START NEW DIAG 0xDC failed, "
                              "return code: %d, new size = %i\n", rc,
                              new_size);

                  rc = appldata_diag(APPLDATA_RECORD_OS_ID,
                                 APPLDATA_STOP_REC,
                                 (unsigned long) ops.data, ops.size,
                                 ops.mod_lvl);
                  if (rc != 0)
                        P_ERROR("os: STOP OLD DIAG 0xDC failed, "
                              "return code: %d, old size = %i\n", rc,
                              ops.size);
                  else
                        P_INFO("os: old record size = %i stopped\n",
                              ops.size);
            }
            ops.size = new_size;
      }
      os_data->timestamp = get_clock();
      os_data->sync_count_2++;
}


/*
 * appldata_os_init()
 *
 * init data, register ops
 */
static int __init appldata_os_init(void)
{
      int rc, max_size;

      max_size = sizeof(struct appldata_os_data) +
               (NR_CPUS * sizeof(struct appldata_os_per_cpu));
      if (max_size > APPLDATA_MAX_REC_SIZE) {
            P_ERROR("Max. size of OS record = %i, bigger than maximum "
                  "record size (%i)\n", max_size, APPLDATA_MAX_REC_SIZE);
            rc = -ENOMEM;
            goto out;
      }

      appldata_os_data = kzalloc(max_size, GFP_DMA);
      if (appldata_os_data == NULL) {
            rc = -ENOMEM;
            goto out;
      }

      appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
      appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
                                          os_cpu);

      ops.data = appldata_os_data;
      ops.callback  = &appldata_get_os_data;
      rc = appldata_register_ops(&ops);
      if (rc != 0)
            kfree(appldata_os_data);
out:
      return rc;
}

/*
 * appldata_os_exit()
 *
 * unregister ops
 */
static void __exit appldata_os_exit(void)
{
      appldata_unregister_ops(&ops);
      kfree(appldata_os_data);
}


module_init(appldata_os_init);
module_exit(appldata_os_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gerald Schaefer");
MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");

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