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