1 /*
2 * arch/s390/appldata/appldata_os.c
3 *
4 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
5 * Collects misc. OS related data (CPU utilization, running processes).
6 *
7 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
8 *
9 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "appldata"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/errno.h>
19 #include <linux/kernel_stat.h>
20 #include <linux/netdevice.h>
21 #include <linux/sched.h>
22 #include <asm/appldata.h>
23 #include <asm/smp.h>
24
25 #include "appldata.h"
26
27
28 #define LOAD_INT(x) ((x) >> FSHIFT)
29 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
30
31 /*
32 * OS data
33 *
34 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
35 * the structure version (product ID, see appldata_base.c) needs to be changed
36 * as well and all documentation and z/VM applications using it must be
37 * updated.
38 *
39 * The record layout is documented in the Linux for zSeries Device Drivers
40 * book:
41 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
42 */
43 struct appldata_os_per_cpu {
44 u32 per_cpu_user; /* timer ticks spent in user mode */
45 u32 per_cpu_nice; /* ... spent with modified priority */
46 u32 per_cpu_system; /* ... spent in kernel mode */
47 u32 per_cpu_idle; /* ... spent in idle mode */
48
49 /* New in 2.6 */
50 u32 per_cpu_irq; /* ... spent in interrupts */
51 u32 per_cpu_softirq; /* ... spent in softirqs */
52 u32 per_cpu_iowait; /* ... spent while waiting for I/O */
53
54 /* New in modification level 01 */
55 u32 per_cpu_steal; /* ... stolen by hypervisor */
56 u32 cpu_id; /* number of this CPU */
57 } __attribute__((packed));
58
59 struct appldata_os_data {
60 u64 timestamp;
61 u32 sync_count_1; /* after VM collected the record data, */
62 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
63 same. If not, the record has been updated on
64 the Linux side while VM was collecting the
65 (possibly corrupt) data */
66
67 u32 nr_cpus; /* number of (virtual) CPUs */
68 u32 per_cpu_size; /* size of the per-cpu data struct */
69 u32 cpu_offset; /* offset of the first per-cpu data struct */
70
71 u32 nr_running; /* number of runnable threads */
72 u32 nr_threads; /* number of threads */
73 u32 avenrun[3]; /* average nr. of running processes during */
74 /* the last 1, 5 and 15 minutes */
75
76 /* New in 2.6 */
77 u32 nr_iowait; /* number of blocked threads
78 (waiting for I/O) */
79
80 /* per cpu data */
81 struct appldata_os_per_cpu os_cpu[0];
82 } __attribute__((packed));
83
84 static struct appldata_os_data *appldata_os_data;
85
86 static struct appldata_ops ops = {
87 .name = "os",
88 .record_nr = APPLDATA_RECORD_OS_ID,
89 .owner = THIS_MODULE,
90 .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */
91 };
92
93
94 /*
95 * appldata_get_os_data()
96 *
97 * gather OS data
98 */
appldata_get_os_data(void * data)99 static void appldata_get_os_data(void *data)
100 {
101 int i, j, rc;
102 struct appldata_os_data *os_data;
103 unsigned int new_size;
104
105 os_data = data;
106 os_data->sync_count_1++;
107
108 os_data->nr_threads = nr_threads;
109 os_data->nr_running = nr_running();
110 os_data->nr_iowait = nr_iowait();
111 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
112 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
113 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
114
115 j = 0;
116 for_each_online_cpu(i) {
117 os_data->os_cpu[j].per_cpu_user =
118 cputime_to_jiffies(kstat_cpu(i).cpustat.user);
119 os_data->os_cpu[j].per_cpu_nice =
120 cputime_to_jiffies(kstat_cpu(i).cpustat.nice);
121 os_data->os_cpu[j].per_cpu_system =
122 cputime_to_jiffies(kstat_cpu(i).cpustat.system);
123 os_data->os_cpu[j].per_cpu_idle =
124 cputime_to_jiffies(kstat_cpu(i).cpustat.idle);
125 os_data->os_cpu[j].per_cpu_irq =
126 cputime_to_jiffies(kstat_cpu(i).cpustat.irq);
127 os_data->os_cpu[j].per_cpu_softirq =
128 cputime_to_jiffies(kstat_cpu(i).cpustat.softirq);
129 os_data->os_cpu[j].per_cpu_iowait =
130 cputime_to_jiffies(kstat_cpu(i).cpustat.iowait);
131 os_data->os_cpu[j].per_cpu_steal =
132 cputime_to_jiffies(kstat_cpu(i).cpustat.steal);
133 os_data->os_cpu[j].cpu_id = i;
134 j++;
135 }
136
137 os_data->nr_cpus = j;
138
139 new_size = sizeof(struct appldata_os_data) +
140 (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));
141 if (ops.size != new_size) {
142 if (ops.active) {
143 rc = appldata_diag(APPLDATA_RECORD_OS_ID,
144 APPLDATA_START_INTERVAL_REC,
145 (unsigned long) ops.data, new_size,
146 ops.mod_lvl);
147 if (rc != 0)
148 pr_err("Starting a new OS data collection "
149 "failed with rc=%d\n", rc);
150
151 rc = appldata_diag(APPLDATA_RECORD_OS_ID,
152 APPLDATA_STOP_REC,
153 (unsigned long) ops.data, ops.size,
154 ops.mod_lvl);
155 if (rc != 0)
156 pr_err("Stopping a faulty OS data "
157 "collection failed with rc=%d\n", rc);
158 }
159 ops.size = new_size;
160 }
161 os_data->timestamp = get_clock();
162 os_data->sync_count_2++;
163 }
164
165
166 /*
167 * appldata_os_init()
168 *
169 * init data, register ops
170 */
appldata_os_init(void)171 static int __init appldata_os_init(void)
172 {
173 int rc, max_size;
174
175 max_size = sizeof(struct appldata_os_data) +
176 (NR_CPUS * sizeof(struct appldata_os_per_cpu));
177 if (max_size > APPLDATA_MAX_REC_SIZE) {
178 pr_err("Maximum OS record size %i exceeds the maximum "
179 "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
180 rc = -ENOMEM;
181 goto out;
182 }
183
184 appldata_os_data = kzalloc(max_size, GFP_DMA);
185 if (appldata_os_data == NULL) {
186 rc = -ENOMEM;
187 goto out;
188 }
189
190 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
191 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data,
192 os_cpu);
193
194 ops.data = appldata_os_data;
195 ops.callback = &appldata_get_os_data;
196 rc = appldata_register_ops(&ops);
197 if (rc != 0)
198 kfree(appldata_os_data);
199 out:
200 return rc;
201 }
202
203 /*
204 * appldata_os_exit()
205 *
206 * unregister ops
207 */
appldata_os_exit(void)208 static void __exit appldata_os_exit(void)
209 {
210 appldata_unregister_ops(&ops);
211 kfree(appldata_os_data);
212 }
213
214
215 module_init(appldata_os_init);
216 module_exit(appldata_os_exit);
217
218 MODULE_LICENSE("GPL");
219 MODULE_AUTHOR("Gerald Schaefer");
220 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");
221