Linux 3.11-rc3
[cris-mirror.git] / arch / s390 / appldata / appldata_os.c
blobde8e2b3b0180e0650dd5a100f9e57a9b89e99359
1 /*
2 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
3 * Collects misc. OS related data (CPU utilization, running processes).
5 * Copyright IBM Corp. 2003, 2006
7 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
8 */
10 #define KMSG_COMPONENT "appldata"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
23 #include "appldata.h"
26 #define LOAD_INT(x) ((x) >> FSHIFT)
27 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
30 * OS data
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.
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
41 struct 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 */
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 */
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));
57 struct 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 */
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 */
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 */
74 /* New in 2.6 */
75 u32 nr_iowait; /* number of blocked threads
76 (waiting for I/O) */
78 /* per cpu data */
79 struct appldata_os_per_cpu os_cpu[0];
80 } __attribute__((packed));
82 static struct appldata_os_data *appldata_os_data;
84 static 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" */
93 * appldata_get_os_data()
95 * gather OS data
97 static void appldata_get_os_data(void *data)
99 int i, j, rc;
100 struct appldata_os_data *os_data;
101 unsigned int new_size;
103 os_data = data;
104 os_data->sync_count_1++;
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);
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++;
135 os_data->nr_cpus = j;
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);
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);
157 ops.size = new_size;
159 os_data->timestamp = get_tod_clock();
160 os_data->sync_count_2++;
165 * appldata_os_init()
167 * init data, register ops
169 static int __init appldata_os_init(void)
171 int rc, max_size;
173 max_size = sizeof(struct appldata_os_data) +
174 (NR_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;
182 appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA);
183 if (appldata_os_data == NULL) {
184 rc = -ENOMEM;
185 goto out;
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);
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);
197 out:
198 return rc;
202 * appldata_os_exit()
204 * unregister ops
206 static void __exit appldata_os_exit(void)
208 appldata_unregister_ops(&ops);
209 kfree(appldata_os_data);
213 module_init(appldata_os_init);
214 module_exit(appldata_os_exit);
216 MODULE_LICENSE("GPL");
217 MODULE_AUTHOR("Gerald Schaefer");
218 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");