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