/*
* 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 = {
.ctl_nr = CTL_APPLDATA_OS,
.name = "os",
.record_nr = APPLDATA_RECORD_OS_ID,
.owner = THIS_MODULE,
.mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */
};
static inline void appldata_print_debug(struct appldata_os_data *os_data)
{
int a0, a1, a2, i;
P_DEBUG("--- OS - RECORD ---\n");
P_DEBUG("nr_threads = %u\n", os_data->nr_threads);
P_DEBUG("nr_running = %u\n", os_data->nr_running);
P_DEBUG("nr_iowait = %u\n", os_data->nr_iowait);
P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0],
os_data->avenrun[1], os_data->avenrun[2]);
a0 = os_data->avenrun[0];
a1 = os_data->avenrun[1];
a2 = os_data->avenrun[2];
P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n",
LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1),
LOAD_INT(a2), LOAD_FRAC(a2));
P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus);
for (i = 0; i < os_data->nr_cpus; i++) {
P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, "
"idle = %u, irq = %u, softirq = %u, iowait = %u, "
"steal = %u\n",
os_data->os_cpu[i].cpu_id,
os_data->os_cpu[i].per_cpu_user,
os_data->os_cpu[i].per_cpu_nice,
os_data->os_cpu[i].per_cpu_system,
os_data->os_cpu[i].per_cpu_idle,
os_data->os_cpu[i].per_cpu_irq,
os_data->os_cpu[i].per_cpu_softirq,
os_data->os_cpu[i].per_cpu_iowait,
os_data->os_cpu[i].per_cpu_steal);
}
P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1);
P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2);
P_DEBUG("timestamp = %lX\n", os_data->timestamp);
}
/*
* 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);
P_INFO("os: stopping old record now\n");
} else
P_INFO("os: new record size = %i\n", 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++;
#ifdef APPLDATA_DEBUG
appldata_print_debug(os_data);
#endif
}
/*
* 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;
}
P_DEBUG("max. sizeof(os) = %i, sizeof(os_cpu) = %lu\n", max_size,
sizeof(struct appldata_os_per_cpu));
appldata_os_data = kzalloc(max_size, GFP_DMA);
if (appldata_os_data == NULL) {
P_ERROR("No memory for %s!\n", ops.name);
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);
P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset);
ops.data = appldata_os_data;
ops.callback = &appldata_get_os_data;
rc = appldata_register_ops(&ops);
if (rc != 0) {
P_ERROR("Error registering ops, rc = %i\n", rc);
kfree(appldata_os_data);
} else {
P_DEBUG("%s-ops registered!\n", ops.name);
}
out:
return rc;
}
/*
* appldata_os_exit()
*
* unregister ops
*/
static void __exit appldata_os_exit(void)
{
appldata_unregister_ops(&ops);
kfree(appldata_os_data);
P_DEBUG("%s-ops unregistered!\n", ops.name);
}
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");
