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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Data gathering module for Linux-VM Monitor Stream, Stage 1. |
3 | * Collects misc. OS related data (CPU utilization, running processes). | |
4 | * | |
a53c8fab | 5 | * Copyright IBM Corp. 2003, 2006 |
1da177e4 | 6 | * |
5b5dd21a | 7 | * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> |
1da177e4 LT |
8 | */ |
9 | ||
e7534b0e GS |
10 | #define KMSG_COMPONENT "appldata" |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
1da177e4 LT |
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> | |
4f17722c | 20 | #include <linux/sched/loadavg.h> |
1f38d613 | 21 | #include <asm/appldata.h> |
1da177e4 LT |
22 | #include <asm/smp.h> |
23 | ||
24 | #include "appldata.h" | |
25 | ||
26 | ||
1da177e4 LT |
27 | #define LOAD_INT(x) ((x) >> FSHIFT) |
28 | #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100) | |
29 | ||
30 | /* | |
31 | * OS data | |
32 | * | |
33 | * This is accessed as binary data by z/VM. If changes to it can't be avoided, | |
34 | * the structure version (product ID, see appldata_base.c) needs to be changed | |
35 | * as well and all documentation and z/VM applications using it must be | |
36 | * updated. | |
37 | * | |
38 | * The record layout is documented in the Linux for zSeries Device Drivers | |
39 | * book: | |
40 | * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml | |
41 | */ | |
42 | struct appldata_os_per_cpu { | |
43 | u32 per_cpu_user; /* timer ticks spent in user mode */ | |
44 | u32 per_cpu_nice; /* ... spent with modified priority */ | |
45 | u32 per_cpu_system; /* ... spent in kernel mode */ | |
46 | u32 per_cpu_idle; /* ... spent in idle mode */ | |
47 | ||
5b5dd21a | 48 | /* New in 2.6 */ |
1da177e4 LT |
49 | u32 per_cpu_irq; /* ... spent in interrupts */ |
50 | u32 per_cpu_softirq; /* ... spent in softirqs */ | |
51 | u32 per_cpu_iowait; /* ... spent while waiting for I/O */ | |
5b5dd21a GS |
52 | |
53 | /* New in modification level 01 */ | |
54 | u32 per_cpu_steal; /* ... stolen by hypervisor */ | |
55 | u32 cpu_id; /* number of this CPU */ | |
f26d583e | 56 | } __attribute__((packed)); |
1da177e4 LT |
57 | |
58 | struct appldata_os_data { | |
59 | u64 timestamp; | |
60 | u32 sync_count_1; /* after VM collected the record data, */ | |
61 | u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the | |
62 | same. If not, the record has been updated on | |
63 | the Linux side while VM was collecting the | |
64 | (possibly corrupt) data */ | |
65 | ||
66 | u32 nr_cpus; /* number of (virtual) CPUs */ | |
67 | u32 per_cpu_size; /* size of the per-cpu data struct */ | |
68 | u32 cpu_offset; /* offset of the first per-cpu data struct */ | |
69 | ||
70 | u32 nr_running; /* number of runnable threads */ | |
71 | u32 nr_threads; /* number of threads */ | |
72 | u32 avenrun[3]; /* average nr. of running processes during */ | |
73 | /* the last 1, 5 and 15 minutes */ | |
74 | ||
5b5dd21a | 75 | /* New in 2.6 */ |
1da177e4 LT |
76 | u32 nr_iowait; /* number of blocked threads |
77 | (waiting for I/O) */ | |
1da177e4 LT |
78 | |
79 | /* per cpu data */ | |
80 | struct appldata_os_per_cpu os_cpu[0]; | |
f26d583e | 81 | } __attribute__((packed)); |
1da177e4 LT |
82 | |
83 | static struct appldata_os_data *appldata_os_data; | |
84 | ||
5b5dd21a | 85 | static struct appldata_ops ops = { |
5b5dd21a GS |
86 | .name = "os", |
87 | .record_nr = APPLDATA_RECORD_OS_ID, | |
88 | .owner = THIS_MODULE, | |
89 | .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */ | |
90 | }; | |
91 | ||
1da177e4 | 92 | |
1da177e4 LT |
93 | /* |
94 | * appldata_get_os_data() | |
95 | * | |
96 | * gather OS data | |
97 | */ | |
98 | static void appldata_get_os_data(void *data) | |
99 | { | |
5b5dd21a | 100 | int i, j, rc; |
1da177e4 | 101 | struct appldata_os_data *os_data; |
5b5dd21a | 102 | unsigned int new_size; |
1da177e4 LT |
103 | |
104 | os_data = data; | |
105 | os_data->sync_count_1++; | |
106 | ||
1da177e4 LT |
107 | os_data->nr_threads = nr_threads; |
108 | os_data->nr_running = nr_running(); | |
109 | os_data->nr_iowait = nr_iowait(); | |
110 | os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); | |
111 | os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); | |
112 | os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); | |
113 | ||
114 | j = 0; | |
115 | for_each_online_cpu(i) { | |
116 | os_data->os_cpu[j].per_cpu_user = | |
7fb1327e | 117 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]); |
1da177e4 | 118 | os_data->os_cpu[j].per_cpu_nice = |
7fb1327e | 119 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]); |
1da177e4 | 120 | os_data->os_cpu[j].per_cpu_system = |
7fb1327e | 121 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]); |
1da177e4 | 122 | os_data->os_cpu[j].per_cpu_idle = |
7fb1327e | 123 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]); |
1da177e4 | 124 | os_data->os_cpu[j].per_cpu_irq = |
7fb1327e | 125 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]); |
1da177e4 | 126 | os_data->os_cpu[j].per_cpu_softirq = |
7fb1327e | 127 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]); |
1da177e4 | 128 | os_data->os_cpu[j].per_cpu_iowait = |
7fb1327e | 129 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]); |
5b5dd21a | 130 | os_data->os_cpu[j].per_cpu_steal = |
7fb1327e | 131 | nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]); |
5b5dd21a | 132 | os_data->os_cpu[j].cpu_id = i; |
1da177e4 LT |
133 | j++; |
134 | } | |
135 | ||
5b5dd21a GS |
136 | os_data->nr_cpus = j; |
137 | ||
138 | new_size = sizeof(struct appldata_os_data) + | |
139 | (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); | |
140 | if (ops.size != new_size) { | |
141 | if (ops.active) { | |
142 | rc = appldata_diag(APPLDATA_RECORD_OS_ID, | |
143 | APPLDATA_START_INTERVAL_REC, | |
144 | (unsigned long) ops.data, new_size, | |
145 | ops.mod_lvl); | |
d3ae942d | 146 | if (rc != 0) |
e7534b0e GS |
147 | pr_err("Starting a new OS data collection " |
148 | "failed with rc=%d\n", rc); | |
5b5dd21a GS |
149 | |
150 | rc = appldata_diag(APPLDATA_RECORD_OS_ID, | |
151 | APPLDATA_STOP_REC, | |
152 | (unsigned long) ops.data, ops.size, | |
153 | ops.mod_lvl); | |
154 | if (rc != 0) | |
e7534b0e GS |
155 | pr_err("Stopping a faulty OS data " |
156 | "collection failed with rc=%d\n", rc); | |
5b5dd21a GS |
157 | } |
158 | ops.size = new_size; | |
159 | } | |
1aae0560 | 160 | os_data->timestamp = get_tod_clock(); |
1da177e4 | 161 | os_data->sync_count_2++; |
1da177e4 LT |
162 | } |
163 | ||
164 | ||
1da177e4 LT |
165 | /* |
166 | * appldata_os_init() | |
167 | * | |
168 | * init data, register ops | |
169 | */ | |
170 | static int __init appldata_os_init(void) | |
171 | { | |
5b5dd21a | 172 | int rc, max_size; |
1da177e4 | 173 | |
5b5dd21a | 174 | max_size = sizeof(struct appldata_os_data) + |
6967037b | 175 | (num_possible_cpus() * sizeof(struct appldata_os_per_cpu)); |
5b5dd21a | 176 | if (max_size > APPLDATA_MAX_REC_SIZE) { |
e7534b0e GS |
177 | pr_err("Maximum OS record size %i exceeds the maximum " |
178 | "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE); | |
1da177e4 LT |
179 | rc = -ENOMEM; |
180 | goto out; | |
181 | } | |
1da177e4 | 182 | |
c2f0e8c8 | 183 | appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA); |
1da177e4 | 184 | if (appldata_os_data == NULL) { |
1da177e4 LT |
185 | rc = -ENOMEM; |
186 | goto out; | |
187 | } | |
1da177e4 LT |
188 | |
189 | appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); | |
190 | appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, | |
191 | os_cpu); | |
1da177e4 LT |
192 | |
193 | ops.data = appldata_os_data; | |
5b5dd21a | 194 | ops.callback = &appldata_get_os_data; |
1da177e4 | 195 | rc = appldata_register_ops(&ops); |
d3ae942d | 196 | if (rc != 0) |
1da177e4 | 197 | kfree(appldata_os_data); |
1da177e4 LT |
198 | out: |
199 | return rc; | |
200 | } | |
201 | ||
202 | /* | |
203 | * appldata_os_exit() | |
204 | * | |
205 | * unregister ops | |
206 | */ | |
207 | static void __exit appldata_os_exit(void) | |
208 | { | |
209 | appldata_unregister_ops(&ops); | |
210 | kfree(appldata_os_data); | |
1da177e4 LT |
211 | } |
212 | ||
213 | ||
214 | module_init(appldata_os_init); | |
215 | module_exit(appldata_os_exit); | |
216 | ||
217 | MODULE_LICENSE("GPL"); | |
218 | MODULE_AUTHOR("Gerald Schaefer"); | |
219 | MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); |