1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
4 * Collects misc. OS related data (CPU utilization, running processes).
5 *
6 * Copyright IBM Corp. 2003, 2006
7 *
8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
9 */
10
11 #define KMSG_COMPONENT "appldata"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/errno.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/netdevice.h>
20 #include <linux/sched.h>
21 #include <linux/sched/loadavg.h>
22 #include <linux/sched/stat.h>
23 #include <asm/appldata.h>
24 #include <asm/smp.h>
25
26 #include "appldata.h"
27
28 /*
29 * OS data
30 *
31 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
32 * the structure version (product ID, see appldata_base.c) needs to be changed
33 * as well and all documentation and z/VM applications using it must be
34 * updated.
35 */
36 struct appldata_os_per_cpu {
37 u32 per_cpu_user; /* timer ticks spent in user mode */
38 u32 per_cpu_nice; /* ... spent with modified priority */
39 u32 per_cpu_system; /* ... spent in kernel mode */
40 u32 per_cpu_idle; /* ... spent in idle mode */
41
42 /* New in 2.6 */
43 u32 per_cpu_irq; /* ... spent in interrupts */
44 u32 per_cpu_softirq; /* ... spent in softirqs */
45 u32 per_cpu_iowait; /* ... spent while waiting for I/O */
46
47 /* New in modification level 01 */
48 u32 per_cpu_steal; /* ... stolen by hypervisor */
49 u32 cpu_id; /* number of this CPU */
50 } __attribute__((packed));
51
52 struct appldata_os_data {
53 u64 timestamp;
54 u32 sync_count_1; /* after VM collected the record data, */
55 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
56 same. If not, the record has been updated on
57 the Linux side while VM was collecting the
58 (possibly corrupt) data */
59
60 u32 nr_cpus; /* number of (virtual) CPUs */
61 u32 per_cpu_size; /* size of the per-cpu data struct */
62 u32 cpu_offset; /* offset of the first per-cpu data struct */
63
64 u32 nr_running; /* number of runnable threads */
65 u32 nr_threads; /* number of threads */
66 u32 avenrun[3]; /* average nr. of running processes during */
67 /* the last 1, 5 and 15 minutes */
68
69 /* New in 2.6 */
70 u32 nr_iowait; /* number of blocked threads
71 (waiting for I/O) */
72
73 /* per cpu data */
74 struct appldata_os_per_cpu os_cpu[];
75 } __attribute__((packed));
76
77 static struct appldata_os_data *appldata_os_data;
78
79 static struct appldata_ops ops = {
80 .name = "os",
81 .record_nr = APPLDATA_RECORD_OS_ID,
82 .owner = THIS_MODULE,
83 .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */
84 };
85
86
87 /*
88 * appldata_get_os_data()
89 *
90 * gather OS data
91 */
92 static void appldata_get_os_data(void *data)
93 {
94 int i, j, rc;
95 struct appldata_os_data *os_data;
96 unsigned int new_size;
97
98 os_data = data;
99 os_data->sync_count_1++;
100
101 os_data->nr_threads = nr_threads;
102 os_data->nr_running = nr_running();
103 os_data->nr_iowait = nr_iowait();
104 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
105 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
106 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
107
108 j = 0;
109 for_each_online_cpu(i) {
110 os_data->os_cpu[j].per_cpu_user =
111 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]);
112 os_data->os_cpu[j].per_cpu_nice =
113 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]);
114 os_data->os_cpu[j].per_cpu_system =
115 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]);
116 os_data->os_cpu[j].per_cpu_idle =
117 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]);
118 os_data->os_cpu[j].per_cpu_irq =
119 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]);
120 os_data->os_cpu[j].per_cpu_softirq =
121 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]);
122 os_data->os_cpu[j].per_cpu_iowait =
123 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]);
124 os_data->os_cpu[j].per_cpu_steal =
125 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]);
126 os_data->os_cpu[j].cpu_id = i;
127 j++;
128 }
129
130 os_data->nr_cpus = j;
131
132 new_size = struct_size(os_data, os_cpu, os_data->nr_cpus);
133 if (ops.size != new_size) {
134 if (ops.active) {
135 rc = appldata_diag(APPLDATA_RECORD_OS_ID,
136 APPLDATA_START_INTERVAL_REC,
137 (unsigned long) ops.data, new_size,
138 ops.mod_lvl);
139 if (rc != 0)
140 pr_err("Starting a new OS data collection "
141 "failed with rc=%d\n", rc);
142
143 rc = appldata_diag(APPLDATA_RECORD_OS_ID,
144 APPLDATA_STOP_REC,
145 (unsigned long) ops.data, ops.size,
146 ops.mod_lvl);
147 if (rc != 0)
148 pr_err("Stopping a faulty OS data "
149 "collection failed with rc=%d\n", rc);
150 }
151 ops.size = new_size;
152 }
153 os_data->timestamp = get_tod_clock();
154 os_data->sync_count_2++;
155 }
156
157
158 /*
159 * appldata_os_init()
160 *
161 * init data, register ops
162 */
163 static int __init appldata_os_init(void)
164 {
165 int rc, max_size;
166
167 max_size = struct_size(appldata_os_data, os_cpu, num_possible_cpus());
168 if (max_size > APPLDATA_MAX_REC_SIZE) {
169 pr_err("Maximum OS record size %i exceeds the maximum "
170 "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);
171 rc = -ENOMEM;
172 goto out;
173 }
174
175 appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA);
176 if (appldata_os_data == NULL) {
177 rc = -ENOMEM;
178 goto out;
179 }
180
181 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
182 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data,
183 os_cpu);
184
185 ops.data = appldata_os_data;
186 ops.callback = &appldata_get_os_data;
187 rc = appldata_register_ops(&ops);
188 if (rc != 0)
189 kfree(appldata_os_data);
190 out:
191 return rc;
192 }
193
194 /*
195 * appldata_os_exit()
196 *
197 * unregister ops
198 */
199 static void __exit appldata_os_exit(void)
200 {
201 appldata_unregister_ops(&ops);
202 kfree(appldata_os_data);
203 }
204
205
206 module_init(appldata_os_init);
207 module_exit(appldata_os_exit);
208
209 MODULE_LICENSE("GPL");
210 MODULE_AUTHOR("Gerald Schaefer");
211 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");
212
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