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1 | /* |
2 | * arch/s390/appldata/appldata_os.c |
3 | * |
4 | * Data gathering module for Linux-VM Monitor Stream, Stage 1. |
5 | * Collects misc. OS related data (CPU utilization, running processes). |
6 | * |
7 | * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH. |
8 | * |
9 | * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> |
10 | */ |
11 | |
12 | #define KMSG_COMPONENT "appldata" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
14 | |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/errno.h> |
19 | #include <linux/kernel_stat.h> |
20 | #include <linux/netdevice.h> |
21 | #include <linux/sched.h> |
22 | #include <asm/appldata.h> |
23 | #include <asm/smp.h> |
24 | |
25 | #include "appldata.h" |
26 | |
27 | |
28 | #define LOAD_INT(x) ((x) >> FSHIFT) |
29 | #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100) |
30 | |
31 | /* |
32 | * OS data |
33 | * |
34 | * This is accessed as binary data by z/VM. If changes to it can't be avoided, |
35 | * the structure version (product ID, see appldata_base.c) needs to be changed |
36 | * as well and all documentation and z/VM applications using it must be |
37 | * updated. |
38 | * |
39 | * The record layout is documented in the Linux for zSeries Device Drivers |
40 | * book: |
41 | * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml |
42 | */ |
43 | struct appldata_os_per_cpu { |
44 | u32 per_cpu_user; /* timer ticks spent in user mode */ |
45 | u32 per_cpu_nice; /* ... spent with modified priority */ |
46 | u32 per_cpu_system; /* ... spent in kernel mode */ |
47 | u32 per_cpu_idle; /* ... spent in idle mode */ |
48 | |
49 | /* New in 2.6 */ |
50 | u32 per_cpu_irq; /* ... spent in interrupts */ |
51 | u32 per_cpu_softirq; /* ... spent in softirqs */ |
52 | u32 per_cpu_iowait; /* ... spent while waiting for I/O */ |
53 | |
54 | /* New in modification level 01 */ |
55 | u32 per_cpu_steal; /* ... stolen by hypervisor */ |
56 | u32 cpu_id; /* number of this CPU */ |
57 | } __attribute__((packed)); |
58 | |
59 | struct appldata_os_data { |
60 | u64 timestamp; |
61 | u32 sync_count_1; /* after VM collected the record data, */ |
62 | u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the |
63 | same. If not, the record has been updated on |
64 | the Linux side while VM was collecting the |
65 | (possibly corrupt) data */ |
66 | |
67 | u32 nr_cpus; /* number of (virtual) CPUs */ |
68 | u32 per_cpu_size; /* size of the per-cpu data struct */ |
69 | u32 cpu_offset; /* offset of the first per-cpu data struct */ |
70 | |
71 | u32 nr_running; /* number of runnable threads */ |
72 | u32 nr_threads; /* number of threads */ |
73 | u32 avenrun[3]; /* average nr. of running processes during */ |
74 | /* the last 1, 5 and 15 minutes */ |
75 | |
76 | /* New in 2.6 */ |
77 | u32 nr_iowait; /* number of blocked threads |
78 | (waiting for I/O) */ |
79 | |
80 | /* per cpu data */ |
81 | struct appldata_os_per_cpu os_cpu[0]; |
82 | } __attribute__((packed)); |
83 | |
84 | static struct appldata_os_data *appldata_os_data; |
85 | |
86 | static struct appldata_ops ops = { |
87 | .name = "os", |
88 | .record_nr = APPLDATA_RECORD_OS_ID, |
89 | .owner = THIS_MODULE, |
90 | .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */ |
91 | }; |
92 | |
93 | |
94 | /* |
95 | * appldata_get_os_data() |
96 | * |
97 | * gather OS data |
98 | */ |
99 | static void appldata_get_os_data(void *data) |
100 | { |
101 | int i, j, rc; |
102 | struct appldata_os_data *os_data; |
103 | unsigned int new_size; |
104 | |
105 | os_data = data; |
106 | os_data->sync_count_1++; |
107 | |
108 | os_data->nr_threads = nr_threads; |
109 | os_data->nr_running = nr_running(); |
110 | os_data->nr_iowait = nr_iowait(); |
111 | os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); |
112 | os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); |
113 | os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); |
114 | |
115 | j = 0; |
116 | for_each_online_cpu(i) { |
117 | os_data->os_cpu[j].per_cpu_user = |
118 | cputime_to_jiffies(kstat_cpu(i).cpustat.user); |
119 | os_data->os_cpu[j].per_cpu_nice = |
120 | cputime_to_jiffies(kstat_cpu(i).cpustat.nice); |
121 | os_data->os_cpu[j].per_cpu_system = |
122 | cputime_to_jiffies(kstat_cpu(i).cpustat.system); |
123 | os_data->os_cpu[j].per_cpu_idle = |
124 | cputime_to_jiffies(kstat_cpu(i).cpustat.idle); |
125 | os_data->os_cpu[j].per_cpu_irq = |
126 | cputime_to_jiffies(kstat_cpu(i).cpustat.irq); |
127 | os_data->os_cpu[j].per_cpu_softirq = |
128 | cputime_to_jiffies(kstat_cpu(i).cpustat.softirq); |
129 | os_data->os_cpu[j].per_cpu_iowait = |
130 | cputime_to_jiffies(kstat_cpu(i).cpustat.iowait); |
131 | os_data->os_cpu[j].per_cpu_steal = |
132 | cputime_to_jiffies(kstat_cpu(i).cpustat.steal); |
133 | os_data->os_cpu[j].cpu_id = i; |
134 | j++; |
135 | } |
136 | |
137 | os_data->nr_cpus = j; |
138 | |
139 | new_size = sizeof(struct appldata_os_data) + |
140 | (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); |
141 | if (ops.size != new_size) { |
142 | if (ops.active) { |
143 | rc = appldata_diag(APPLDATA_RECORD_OS_ID, |
144 | APPLDATA_START_INTERVAL_REC, |
145 | (unsigned long) ops.data, new_size, |
146 | ops.mod_lvl); |
147 | if (rc != 0) |
148 | pr_err("Starting a new OS data collection " |
149 | "failed with rc=%d\n", rc); |
150 | |
151 | rc = appldata_diag(APPLDATA_RECORD_OS_ID, |
152 | APPLDATA_STOP_REC, |
153 | (unsigned long) ops.data, ops.size, |
154 | ops.mod_lvl); |
155 | if (rc != 0) |
156 | pr_err("Stopping a faulty OS data " |
157 | "collection failed with rc=%d\n", rc); |
158 | } |
159 | ops.size = new_size; |
160 | } |
161 | os_data->timestamp = get_clock(); |
162 | os_data->sync_count_2++; |
163 | } |
164 | |
165 | |
166 | /* |
167 | * appldata_os_init() |
168 | * |
169 | * init data, register ops |
170 | */ |
171 | static int __init appldata_os_init(void) |
172 | { |
173 | int rc, max_size; |
174 | |
175 | max_size = sizeof(struct appldata_os_data) + |
176 | (NR_CPUS * sizeof(struct appldata_os_per_cpu)); |
177 | if (max_size > APPLDATA_MAX_REC_SIZE) { |
178 | pr_err("Maximum OS record size %i exceeds the maximum " |
179 | "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE); |
180 | rc = -ENOMEM; |
181 | goto out; |
182 | } |
183 | |
184 | appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA); |
185 | if (appldata_os_data == NULL) { |
186 | rc = -ENOMEM; |
187 | goto out; |
188 | } |
189 | |
190 | appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); |
191 | appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, |
192 | os_cpu); |
193 | |
194 | ops.data = appldata_os_data; |
195 | ops.callback = &appldata_get_os_data; |
196 | rc = appldata_register_ops(&ops); |
197 | if (rc != 0) |
198 | kfree(appldata_os_data); |
199 | out: |
200 | return rc; |
201 | } |
202 | |
203 | /* |
204 | * appldata_os_exit() |
205 | * |
206 | * unregister ops |
207 | */ |
208 | static void __exit appldata_os_exit(void) |
209 | { |
210 | appldata_unregister_ops(&ops); |
211 | kfree(appldata_os_data); |
212 | } |
213 | |
214 | |
215 | module_init(appldata_os_init); |
216 | module_exit(appldata_os_exit); |
217 | |
218 | MODULE_LICENSE("GPL"); |
219 | MODULE_AUTHOR("Gerald Schaefer"); |
220 | MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); |
221 |
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