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 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/slab.h> 15 #include <linux/errno.h> 16 #include <linux/kernel_stat.h> 17 #include <linux/netdevice.h> 18 #include <linux/sched.h> 19 #include <asm/appldata.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 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)); 56 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 */ 64 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 */ 68 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 */ 73 74 /* New in 2.6 */ 75 u32 nr_iowait; /* number of blocked threads 76 (waiting for I/O) */ 77 78 /* per cpu data */ 79 struct appldata_os_per_cpu os_cpu[0]; 80 } __attribute__((packed)); 81 82 static struct appldata_os_data *appldata_os_data; 83 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" */ 89 }; 90 91 92 static inline void appldata_print_debug(struct appldata_os_data *os_data) 93 { 94 int a0, a1, a2, i; 95 96 P_DEBUG("--- OS - RECORD ---\n"); 97 P_DEBUG("nr_threads = %u\n", os_data->nr_threads); 98 P_DEBUG("nr_running = %u\n", os_data->nr_running); 99 P_DEBUG("nr_iowait = %u\n", os_data->nr_iowait); 100 P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0], 101 os_data->avenrun[1], os_data->avenrun[2]); 102 a0 = os_data->avenrun[0]; 103 a1 = os_data->avenrun[1]; 104 a2 = os_data->avenrun[2]; 105 P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n", 106 LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1), 107 LOAD_INT(a2), LOAD_FRAC(a2)); 108 109 P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus); 110 for (i = 0; i < os_data->nr_cpus; i++) { 111 P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, " 112 "idle = %u, irq = %u, softirq = %u, iowait = %u, " 113 "steal = %u\n", 114 os_data->os_cpu[i].cpu_id, 115 os_data->os_cpu[i].per_cpu_user, 116 os_data->os_cpu[i].per_cpu_nice, 117 os_data->os_cpu[i].per_cpu_system, 118 os_data->os_cpu[i].per_cpu_idle, 119 os_data->os_cpu[i].per_cpu_irq, 120 os_data->os_cpu[i].per_cpu_softirq, 121 os_data->os_cpu[i].per_cpu_iowait, 122 os_data->os_cpu[i].per_cpu_steal); 123 } 124 125 P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1); 126 P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2); 127 P_DEBUG("timestamp = %lX\n", os_data->timestamp); 128 } 129 130 /* 131 * appldata_get_os_data() 132 * 133 * gather OS data 134 */ 135 static void appldata_get_os_data(void *data) 136 { 137 int i, j, rc; 138 struct appldata_os_data *os_data; 139 unsigned int new_size; 140 141 os_data = data; 142 os_data->sync_count_1++; 143 144 os_data->nr_threads = nr_threads; 145 os_data->nr_running = nr_running(); 146 os_data->nr_iowait = nr_iowait(); 147 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); 148 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); 149 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); 150 151 j = 0; 152 for_each_online_cpu(i) { 153 os_data->os_cpu[j].per_cpu_user = 154 cputime_to_jiffies(kstat_cpu(i).cpustat.user); 155 os_data->os_cpu[j].per_cpu_nice = 156 cputime_to_jiffies(kstat_cpu(i).cpustat.nice); 157 os_data->os_cpu[j].per_cpu_system = 158 cputime_to_jiffies(kstat_cpu(i).cpustat.system); 159 os_data->os_cpu[j].per_cpu_idle = 160 cputime_to_jiffies(kstat_cpu(i).cpustat.idle); 161 os_data->os_cpu[j].per_cpu_irq = 162 cputime_to_jiffies(kstat_cpu(i).cpustat.irq); 163 os_data->os_cpu[j].per_cpu_softirq = 164 cputime_to_jiffies(kstat_cpu(i).cpustat.softirq); 165 os_data->os_cpu[j].per_cpu_iowait = 166 cputime_to_jiffies(kstat_cpu(i).cpustat.iowait); 167 os_data->os_cpu[j].per_cpu_steal = 168 cputime_to_jiffies(kstat_cpu(i).cpustat.steal); 169 os_data->os_cpu[j].cpu_id = i; 170 j++; 171 } 172 173 os_data->nr_cpus = j; 174 175 new_size = sizeof(struct appldata_os_data) + 176 (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); 177 if (ops.size != new_size) { 178 if (ops.active) { 179 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 180 APPLDATA_START_INTERVAL_REC, 181 (unsigned long) ops.data, new_size, 182 ops.mod_lvl); 183 if (rc != 0) { 184 P_ERROR("os: START NEW DIAG 0xDC failed, " 185 "return code: %d, new size = %i\n", rc, 186 new_size); 187 P_INFO("os: stopping old record now\n"); 188 } else 189 P_INFO("os: new record size = %i\n", new_size); 190 191 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 192 APPLDATA_STOP_REC, 193 (unsigned long) ops.data, ops.size, 194 ops.mod_lvl); 195 if (rc != 0) 196 P_ERROR("os: STOP OLD DIAG 0xDC failed, " 197 "return code: %d, old size = %i\n", rc, 198 ops.size); 199 else 200 P_INFO("os: old record size = %i stopped\n", 201 ops.size); 202 } 203 ops.size = new_size; 204 } 205 os_data->timestamp = get_clock(); 206 os_data->sync_count_2++; 207 #ifdef APPLDATA_DEBUG 208 appldata_print_debug(os_data); 209 #endif 210 } 211 212 213 /* 214 * appldata_os_init() 215 * 216 * init data, register ops 217 */ 218 static int __init appldata_os_init(void) 219 { 220 int rc, max_size; 221 222 max_size = sizeof(struct appldata_os_data) + 223 (NR_CPUS * sizeof(struct appldata_os_per_cpu)); 224 if (max_size > APPLDATA_MAX_REC_SIZE) { 225 P_ERROR("Max. size of OS record = %i, bigger than maximum " 226 "record size (%i)\n", max_size, APPLDATA_MAX_REC_SIZE); 227 rc = -ENOMEM; 228 goto out; 229 } 230 P_DEBUG("max. sizeof(os) = %i, sizeof(os_cpu) = %lu\n", max_size, 231 sizeof(struct appldata_os_per_cpu)); 232 233 appldata_os_data = kzalloc(max_size, GFP_DMA); 234 if (appldata_os_data == NULL) { 235 P_ERROR("No memory for %s!\n", ops.name); 236 rc = -ENOMEM; 237 goto out; 238 } 239 240 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); 241 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, 242 os_cpu); 243 P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset); 244 245 ops.data = appldata_os_data; 246 ops.callback = &appldata_get_os_data; 247 rc = appldata_register_ops(&ops); 248 if (rc != 0) { 249 P_ERROR("Error registering ops, rc = %i\n", rc); 250 kfree(appldata_os_data); 251 } else { 252 P_DEBUG("%s-ops registered!\n", ops.name); 253 } 254 out: 255 return rc; 256 } 257 258 /* 259 * appldata_os_exit() 260 * 261 * unregister ops 262 */ 263 static void __exit appldata_os_exit(void) 264 { 265 appldata_unregister_ops(&ops); 266 kfree(appldata_os_data); 267 P_DEBUG("%s-ops unregistered!\n", ops.name); 268 } 269 270 271 module_init(appldata_os_init); 272 module_exit(appldata_os_exit); 273 274 MODULE_LICENSE("GPL"); 275 MODULE_AUTHOR("Gerald Schaefer"); 276 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); 277