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 | function: APPLDATA_START_INTERVAL_REC, |
137 | buffer: (unsigned long) ops.data, length: new_size, |
138 | mod_lvl: 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 | function: APPLDATA_STOP_REC, |
145 | buffer: (unsigned long) ops.data, length: ops.size, |
146 | mod_lvl: 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(size: 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: &ops); |
188 | if (rc != 0) |
189 | kfree(objp: 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: &ops); |
202 | kfree(objp: 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 | |