2 * arch/s390/appldata/appldata_os.c
4 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
5 * Collects misc. OS related data (CPU utilization, running processes).
7 * Copyright (C) 2003 IBM Corporation, IBM Deutschland Entwicklung GmbH.
9 * Author: Gerald Schaefer <geraldsc@de.ibm.com>
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/errno.h>
17 #include <linux/kernel_stat.h>
18 #include <linux/netdevice.h>
19 #include <linux/sched.h>
25 #define MY_PRINT_NAME "appldata_os" /* for debug messages, etc. */
26 #define LOAD_INT(x) ((x) >> FSHIFT)
27 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
32 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
33 * the structure version (product ID, see appldata_base.c) needs to be changed
34 * as well and all documentation and z/VM applications using it must be
37 * The record layout is documented in the Linux for zSeries Device Drivers
39 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
41 struct appldata_os_per_cpu {
42 u32 per_cpu_user; /* timer ticks spent in user mode */
43 u32 per_cpu_nice; /* ... spent with modified priority */
44 u32 per_cpu_system; /* ... spent in kernel mode */
45 u32 per_cpu_idle; /* ... spent in idle mode */
48 u32 per_cpu_irq; /* ... spent in interrupts */
49 u32 per_cpu_softirq; /* ... spent in softirqs */
50 u32 per_cpu_iowait; /* ... spent while waiting for I/O */
52 } __attribute__((packed));
54 struct appldata_os_data {
56 u32 sync_count_1; /* after VM collected the record data, */
57 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
58 same. If not, the record has been updated on
59 the Linux side while VM was collecting the
60 (possibly corrupt) data */
62 u32 nr_cpus; /* number of (virtual) CPUs */
63 u32 per_cpu_size; /* size of the per-cpu data struct */
64 u32 cpu_offset; /* offset of the first per-cpu data struct */
66 u32 nr_running; /* number of runnable threads */
67 u32 nr_threads; /* number of threads */
68 u32 avenrun[3]; /* average nr. of running processes during */
69 /* the last 1, 5 and 15 minutes */
72 u32 nr_iowait; /* number of blocked threads
77 struct appldata_os_per_cpu os_cpu[0];
78 } __attribute__((packed));
80 static struct appldata_os_data *appldata_os_data;
83 static inline void appldata_print_debug(struct appldata_os_data *os_data)
87 P_DEBUG("--- OS - RECORD ---\n");
88 P_DEBUG("nr_threads = %u\n", os_data->nr_threads);
89 P_DEBUG("nr_running = %u\n", os_data->nr_running);
90 P_DEBUG("nr_iowait = %u\n", os_data->nr_iowait);
91 P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0],
92 os_data->avenrun[1], os_data->avenrun[2]);
93 a0 = os_data->avenrun[0];
94 a1 = os_data->avenrun[1];
95 a2 = os_data->avenrun[2];
96 P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n",
97 LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1),
98 LOAD_INT(a2), LOAD_FRAC(a2));
100 P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus);
101 for (i = 0; i < os_data->nr_cpus; i++) {
102 P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, "
103 "idle = %u, irq = %u, softirq = %u, iowait = %u\n",
105 os_data->os_cpu[i].per_cpu_user,
106 os_data->os_cpu[i].per_cpu_nice,
107 os_data->os_cpu[i].per_cpu_system,
108 os_data->os_cpu[i].per_cpu_idle,
109 os_data->os_cpu[i].per_cpu_irq,
110 os_data->os_cpu[i].per_cpu_softirq,
111 os_data->os_cpu[i].per_cpu_iowait);
114 P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1);
115 P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2);
116 P_DEBUG("timestamp = %lX\n", os_data->timestamp);
120 * appldata_get_os_data()
124 static void appldata_get_os_data(void *data)
127 struct appldata_os_data *os_data;
130 os_data->sync_count_1++;
132 os_data->nr_cpus = num_online_cpus();
134 os_data->nr_threads = nr_threads;
135 os_data->nr_running = nr_running();
136 os_data->nr_iowait = nr_iowait();
137 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
138 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
139 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
142 for_each_online_cpu(i) {
143 os_data->os_cpu[j].per_cpu_user =
144 kstat_cpu(i).cpustat.user;
145 os_data->os_cpu[j].per_cpu_nice =
146 kstat_cpu(i).cpustat.nice;
147 os_data->os_cpu[j].per_cpu_system =
148 kstat_cpu(i).cpustat.system;
149 os_data->os_cpu[j].per_cpu_idle =
150 kstat_cpu(i).cpustat.idle;
151 os_data->os_cpu[j].per_cpu_irq =
152 kstat_cpu(i).cpustat.irq;
153 os_data->os_cpu[j].per_cpu_softirq =
154 kstat_cpu(i).cpustat.softirq;
155 os_data->os_cpu[j].per_cpu_iowait =
156 kstat_cpu(i).cpustat.iowait;
160 os_data->timestamp = get_clock();
161 os_data->sync_count_2++;
162 #ifdef APPLDATA_DEBUG
163 appldata_print_debug(os_data);
168 static struct appldata_ops ops = {
169 .ctl_nr = CTL_APPLDATA_OS,
171 .record_nr = APPLDATA_RECORD_OS_ID,
172 .callback = &appldata_get_os_data,
173 .owner = THIS_MODULE,
180 * init data, register ops
182 static int __init appldata_os_init(void)
186 size = sizeof(struct appldata_os_data) +
187 (NR_CPUS * sizeof(struct appldata_os_per_cpu));
188 if (size > APPLDATA_MAX_REC_SIZE) {
189 P_ERROR("Size of record = %i, bigger than maximum (%i)!\n",
190 size, APPLDATA_MAX_REC_SIZE);
194 P_DEBUG("sizeof(os) = %i, sizeof(os_cpu) = %lu\n", size,
195 sizeof(struct appldata_os_per_cpu));
197 appldata_os_data = kmalloc(size, GFP_DMA);
198 if (appldata_os_data == NULL) {
199 P_ERROR("No memory for %s!\n", ops.name);
203 memset(appldata_os_data, 0, size);
205 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
206 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data,
208 P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset);
210 ops.data = appldata_os_data;
212 rc = appldata_register_ops(&ops);
214 P_ERROR("Error registering ops, rc = %i\n", rc);
215 kfree(appldata_os_data);
217 P_DEBUG("%s-ops registered!\n", ops.name);
228 static void __exit appldata_os_exit(void)
230 appldata_unregister_ops(&ops);
231 kfree(appldata_os_data);
232 P_DEBUG("%s-ops unregistered!\n", ops.name);
236 module_init(appldata_os_init);
237 module_exit(appldata_os_exit);
239 MODULE_LICENSE("GPL");
240 MODULE_AUTHOR("Gerald Schaefer");
241 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");