218 lines
6 KiB
C
218 lines
6 KiB
C
/*
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* Data gathering module for Linux-VM Monitor Stream, Stage 1.
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* Collects misc. OS related data (CPU utilization, running processes).
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*
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* Copyright IBM Corp. 2003, 2006
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*
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* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#define KMSG_COMPONENT "appldata"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/netdevice.h>
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#include <linux/sched.h>
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#include <asm/appldata.h>
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#include <asm/smp.h>
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#include "appldata.h"
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#define LOAD_INT(x) ((x) >> FSHIFT)
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#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
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/*
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* OS data
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*
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* This is accessed as binary data by z/VM. If changes to it can't be avoided,
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* the structure version (product ID, see appldata_base.c) needs to be changed
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* as well and all documentation and z/VM applications using it must be
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* updated.
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*
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* The record layout is documented in the Linux for zSeries Device Drivers
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* book:
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* http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
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*/
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struct appldata_os_per_cpu {
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u32 per_cpu_user; /* timer ticks spent in user mode */
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u32 per_cpu_nice; /* ... spent with modified priority */
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u32 per_cpu_system; /* ... spent in kernel mode */
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u32 per_cpu_idle; /* ... spent in idle mode */
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/* New in 2.6 */
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u32 per_cpu_irq; /* ... spent in interrupts */
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u32 per_cpu_softirq; /* ... spent in softirqs */
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u32 per_cpu_iowait; /* ... spent while waiting for I/O */
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/* New in modification level 01 */
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u32 per_cpu_steal; /* ... stolen by hypervisor */
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u32 cpu_id; /* number of this CPU */
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} __attribute__((packed));
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struct appldata_os_data {
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u64 timestamp;
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u32 sync_count_1; /* after VM collected the record data, */
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u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
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same. If not, the record has been updated on
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the Linux side while VM was collecting the
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(possibly corrupt) data */
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u32 nr_cpus; /* number of (virtual) CPUs */
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u32 per_cpu_size; /* size of the per-cpu data struct */
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u32 cpu_offset; /* offset of the first per-cpu data struct */
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u32 nr_running; /* number of runnable threads */
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u32 nr_threads; /* number of threads */
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u32 avenrun[3]; /* average nr. of running processes during */
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/* the last 1, 5 and 15 minutes */
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/* New in 2.6 */
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u32 nr_iowait; /* number of blocked threads
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(waiting for I/O) */
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/* per cpu data */
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struct appldata_os_per_cpu os_cpu[0];
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} __attribute__((packed));
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static struct appldata_os_data *appldata_os_data;
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static struct appldata_ops ops = {
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.name = "os",
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.record_nr = APPLDATA_RECORD_OS_ID,
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.owner = THIS_MODULE,
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.mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */
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};
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/*
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* appldata_get_os_data()
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*
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* gather OS data
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*/
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static void appldata_get_os_data(void *data)
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{
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int i, j, rc;
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struct appldata_os_data *os_data;
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unsigned int new_size;
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os_data = data;
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os_data->sync_count_1++;
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os_data->nr_threads = nr_threads;
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os_data->nr_running = nr_running();
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os_data->nr_iowait = nr_iowait();
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os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
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os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
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os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
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j = 0;
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for_each_online_cpu(i) {
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os_data->os_cpu[j].per_cpu_user =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]);
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os_data->os_cpu[j].per_cpu_nice =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]);
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os_data->os_cpu[j].per_cpu_system =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]);
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os_data->os_cpu[j].per_cpu_idle =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]);
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os_data->os_cpu[j].per_cpu_irq =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]);
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os_data->os_cpu[j].per_cpu_softirq =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]);
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os_data->os_cpu[j].per_cpu_iowait =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]);
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os_data->os_cpu[j].per_cpu_steal =
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cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]);
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os_data->os_cpu[j].cpu_id = i;
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j++;
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}
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os_data->nr_cpus = j;
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new_size = sizeof(struct appldata_os_data) +
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(os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));
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if (ops.size != new_size) {
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if (ops.active) {
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rc = appldata_diag(APPLDATA_RECORD_OS_ID,
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APPLDATA_START_INTERVAL_REC,
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(unsigned long) ops.data, new_size,
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ops.mod_lvl);
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if (rc != 0)
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pr_err("Starting a new OS data collection "
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"failed with rc=%d\n", rc);
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rc = appldata_diag(APPLDATA_RECORD_OS_ID,
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APPLDATA_STOP_REC,
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(unsigned long) ops.data, ops.size,
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ops.mod_lvl);
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if (rc != 0)
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pr_err("Stopping a faulty OS data "
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"collection failed with rc=%d\n", rc);
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}
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ops.size = new_size;
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}
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os_data->timestamp = get_tod_clock();
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os_data->sync_count_2++;
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}
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/*
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* appldata_os_init()
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*
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* init data, register ops
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*/
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static int __init appldata_os_init(void)
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{
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int rc, max_size;
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max_size = sizeof(struct appldata_os_data) +
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(num_possible_cpus() * sizeof(struct appldata_os_per_cpu));
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if (max_size > APPLDATA_MAX_REC_SIZE) {
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pr_err("Maximum OS record size %i exceeds the maximum "
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"record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
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rc = -ENOMEM;
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goto out;
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}
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appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA);
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if (appldata_os_data == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
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appldata_os_data->cpu_offset = offsetof(struct appldata_os_data,
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os_cpu);
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ops.data = appldata_os_data;
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ops.callback = &appldata_get_os_data;
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rc = appldata_register_ops(&ops);
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if (rc != 0)
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kfree(appldata_os_data);
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out:
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return rc;
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}
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/*
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* appldata_os_exit()
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*
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* unregister ops
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*/
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static void __exit appldata_os_exit(void)
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{
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appldata_unregister_ops(&ops);
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kfree(appldata_os_data);
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}
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module_init(appldata_os_init);
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module_exit(appldata_os_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Gerald Schaefer");
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MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");
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