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 IBM Corporation, IBM Deutschland Entwicklung GmbH. 8 * 9 * Author: Gerald Schaefer <geraldsc@de.ibm.com> 10 */ 11 12 #include <linux/config.h> 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/smp.h> 21 22 #include "appldata.h" 23 24 25 #define MY_PRINT_NAME "appldata_os" /* for debug messages, etc. */ 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 */ 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 */ 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 // <-- New in 2.6 52 } __attribute__((packed)); 53 54 struct appldata_os_data { 55 u64 timestamp; 56 u32 sync_count_1; /* after VM collected the record data, */ 57 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the 58 same. If not, the record has been updated on 59 the Linux side while VM was collecting the 60 (possibly corrupt) data */ 61 62 u32 nr_cpus; /* number of (virtual) CPUs */ 63 u32 per_cpu_size; /* size of the per-cpu data struct */ 64 u32 cpu_offset; /* offset of the first per-cpu data struct */ 65 66 u32 nr_running; /* number of runnable threads */ 67 u32 nr_threads; /* number of threads */ 68 u32 avenrun[3]; /* average nr. of running processes during */ 69 /* the last 1, 5 and 15 minutes */ 70 71 // New in 2.6 --> 72 u32 nr_iowait; /* number of blocked threads 73 (waiting for I/O) */ 74 // <-- New in 2.6 75 76 /* per cpu data */ 77 struct appldata_os_per_cpu os_cpu[0]; 78 } __attribute__((packed)); 79 80 static struct appldata_os_data *appldata_os_data; 81 82 83 static inline void appldata_print_debug(struct appldata_os_data *os_data) 84 { 85 int a0, a1, a2, i; 86 87 P_DEBUG("--- OS - RECORD ---\n"); 88 P_DEBUG("nr_threads = %u\n", os_data->nr_threads); 89 P_DEBUG("nr_running = %u\n", os_data->nr_running); 90 P_DEBUG("nr_iowait = %u\n", os_data->nr_iowait); 91 P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0], 92 os_data->avenrun[1], os_data->avenrun[2]); 93 a0 = os_data->avenrun[0]; 94 a1 = os_data->avenrun[1]; 95 a2 = os_data->avenrun[2]; 96 P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n", 97 LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1), 98 LOAD_INT(a2), LOAD_FRAC(a2)); 99 100 P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus); 101 for (i = 0; i < os_data->nr_cpus; i++) { 102 P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, " 103 "idle = %u, irq = %u, softirq = %u, iowait = %u\n", 104 i, 105 os_data->os_cpu[i].per_cpu_user, 106 os_data->os_cpu[i].per_cpu_nice, 107 os_data->os_cpu[i].per_cpu_system, 108 os_data->os_cpu[i].per_cpu_idle, 109 os_data->os_cpu[i].per_cpu_irq, 110 os_data->os_cpu[i].per_cpu_softirq, 111 os_data->os_cpu[i].per_cpu_iowait); 112 } 113 114 P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1); 115 P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2); 116 P_DEBUG("timestamp = %lX\n", os_data->timestamp); 117 } 118 119 /* 120 * appldata_get_os_data() 121 * 122 * gather OS data 123 */ 124 static void appldata_get_os_data(void *data) 125 { 126 int i, j; 127 struct appldata_os_data *os_data; 128 129 os_data = data; 130 os_data->sync_count_1++; 131 132 os_data->nr_cpus = num_online_cpus(); 133 134 os_data->nr_threads = nr_threads; 135 os_data->nr_running = nr_running(); 136 os_data->nr_iowait = nr_iowait(); 137 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); 138 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); 139 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); 140 141 j = 0; 142 for_each_online_cpu(i) { 143 os_data->os_cpu[j].per_cpu_user = 144 kstat_cpu(i).cpustat.user; 145 os_data->os_cpu[j].per_cpu_nice = 146 kstat_cpu(i).cpustat.nice; 147 os_data->os_cpu[j].per_cpu_system = 148 kstat_cpu(i).cpustat.system; 149 os_data->os_cpu[j].per_cpu_idle = 150 kstat_cpu(i).cpustat.idle; 151 os_data->os_cpu[j].per_cpu_irq = 152 kstat_cpu(i).cpustat.irq; 153 os_data->os_cpu[j].per_cpu_softirq = 154 kstat_cpu(i).cpustat.softirq; 155 os_data->os_cpu[j].per_cpu_iowait = 156 kstat_cpu(i).cpustat.iowait; 157 j++; 158 } 159 160 os_data->timestamp = get_clock(); 161 os_data->sync_count_2++; 162 #ifdef APPLDATA_DEBUG 163 appldata_print_debug(os_data); 164 #endif 165 } 166 167 168 static struct appldata_ops ops = { 169 .ctl_nr = CTL_APPLDATA_OS, 170 .name = "os", 171 .record_nr = APPLDATA_RECORD_OS_ID, 172 .callback = &appldata_get_os_data, 173 .owner = THIS_MODULE, 174 }; 175 176 177 /* 178 * appldata_os_init() 179 * 180 * init data, register ops 181 */ 182 static int __init appldata_os_init(void) 183 { 184 int rc, size; 185 186 size = sizeof(struct appldata_os_data) + 187 (NR_CPUS * sizeof(struct appldata_os_per_cpu)); 188 if (size > APPLDATA_MAX_REC_SIZE) { 189 P_ERROR("Size of record = %i, bigger than maximum (%i)!\n", 190 size, APPLDATA_MAX_REC_SIZE); 191 rc = -ENOMEM; 192 goto out; 193 } 194 P_DEBUG("sizeof(os) = %i, sizeof(os_cpu) = %lu\n", size, 195 sizeof(struct appldata_os_per_cpu)); 196 197 appldata_os_data = kmalloc(size, GFP_DMA); 198 if (appldata_os_data == NULL) { 199 P_ERROR("No memory for %s!\n", ops.name); 200 rc = -ENOMEM; 201 goto out; 202 } 203 memset(appldata_os_data, 0, size); 204 205 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); 206 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, 207 os_cpu); 208 P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset); 209 210 ops.data = appldata_os_data; 211 ops.size = size; 212 rc = appldata_register_ops(&ops); 213 if (rc != 0) { 214 P_ERROR("Error registering ops, rc = %i\n", rc); 215 kfree(appldata_os_data); 216 } else { 217 P_DEBUG("%s-ops registered!\n", ops.name); 218 } 219 out: 220 return rc; 221 } 222 223 /* 224 * appldata_os_exit() 225 * 226 * unregister ops 227 */ 228 static void __exit appldata_os_exit(void) 229 { 230 appldata_unregister_ops(&ops); 231 kfree(appldata_os_data); 232 P_DEBUG("%s-ops unregistered!\n", ops.name); 233 } 234 235 236 module_init(appldata_os_init); 237 module_exit(appldata_os_exit); 238 239 MODULE_LICENSE("GPL"); 240 MODULE_AUTHOR("Gerald Schaefer"); 241 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); 242