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 */ 41struct 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 57struct 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 82static struct appldata_os_data *appldata_os_data; 83 84static struct appldata_ops ops = { 85 .ctl_nr = CTL_APPLDATA_OS, 86 .name = "os", 87 .record_nr = APPLDATA_RECORD_OS_ID, 88 .owner = THIS_MODULE, 89 .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */ 90}; 91 92 93static inline void appldata_print_debug(struct appldata_os_data *os_data) 94{ 95 int a0, a1, a2, i; 96 97 P_DEBUG("--- OS - RECORD ---\n"); 98 P_DEBUG("nr_threads = %u\n", os_data->nr_threads); 99 P_DEBUG("nr_running = %u\n", os_data->nr_running); 100 P_DEBUG("nr_iowait = %u\n", os_data->nr_iowait); 101 P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0], 102 os_data->avenrun[1], os_data->avenrun[2]); 103 a0 = os_data->avenrun[0]; 104 a1 = os_data->avenrun[1]; 105 a2 = os_data->avenrun[2]; 106 P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n", 107 LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1), 108 LOAD_INT(a2), LOAD_FRAC(a2)); 109 110 P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus); 111 for (i = 0; i < os_data->nr_cpus; i++) { 112 P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, " 113 "idle = %u, irq = %u, softirq = %u, iowait = %u, " 114 "steal = %u\n", 115 os_data->os_cpu[i].cpu_id, 116 os_data->os_cpu[i].per_cpu_user, 117 os_data->os_cpu[i].per_cpu_nice, 118 os_data->os_cpu[i].per_cpu_system, 119 os_data->os_cpu[i].per_cpu_idle, 120 os_data->os_cpu[i].per_cpu_irq, 121 os_data->os_cpu[i].per_cpu_softirq, 122 os_data->os_cpu[i].per_cpu_iowait, 123 os_data->os_cpu[i].per_cpu_steal); 124 } 125 126 P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1); 127 P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2); 128 P_DEBUG("timestamp = %lX\n", os_data->timestamp); 129} 130 131/* 132 * appldata_get_os_data() 133 * 134 * gather OS data 135 */ 136static void appldata_get_os_data(void *data) 137{ 138 int i, j, rc; 139 struct appldata_os_data *os_data; 140 unsigned int new_size; 141 142 os_data = data; 143 os_data->sync_count_1++; 144 145 os_data->nr_threads = nr_threads; 146 os_data->nr_running = nr_running(); 147 os_data->nr_iowait = nr_iowait(); 148 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); 149 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); 150 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); 151 152 j = 0; 153 for_each_online_cpu(i) { 154 os_data->os_cpu[j].per_cpu_user = 155 cputime_to_jiffies(kstat_cpu(i).cpustat.user); 156 os_data->os_cpu[j].per_cpu_nice = 157 cputime_to_jiffies(kstat_cpu(i).cpustat.nice); 158 os_data->os_cpu[j].per_cpu_system = 159 cputime_to_jiffies(kstat_cpu(i).cpustat.system); 160 os_data->os_cpu[j].per_cpu_idle = 161 cputime_to_jiffies(kstat_cpu(i).cpustat.idle); 162 os_data->os_cpu[j].per_cpu_irq = 163 cputime_to_jiffies(kstat_cpu(i).cpustat.irq); 164 os_data->os_cpu[j].per_cpu_softirq = 165 cputime_to_jiffies(kstat_cpu(i).cpustat.softirq); 166 os_data->os_cpu[j].per_cpu_iowait = 167 cputime_to_jiffies(kstat_cpu(i).cpustat.iowait); 168 os_data->os_cpu[j].per_cpu_steal = 169 cputime_to_jiffies(kstat_cpu(i).cpustat.steal); 170 os_data->os_cpu[j].cpu_id = i; 171 j++; 172 } 173 174 os_data->nr_cpus = j; 175 176 new_size = sizeof(struct appldata_os_data) + 177 (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); 178 if (ops.size != new_size) { 179 if (ops.active) { 180 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 181 APPLDATA_START_INTERVAL_REC, 182 (unsigned long) ops.data, new_size, 183 ops.mod_lvl); 184 if (rc != 0) { 185 P_ERROR("os: START NEW DIAG 0xDC failed, " 186 "return code: %d, new size = %i\n", rc, 187 new_size); 188 P_INFO("os: stopping old record now\n"); 189 } else 190 P_INFO("os: new record size = %i\n", new_size); 191 192 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 193 APPLDATA_STOP_REC, 194 (unsigned long) ops.data, ops.size, 195 ops.mod_lvl); 196 if (rc != 0) 197 P_ERROR("os: STOP OLD DIAG 0xDC failed, " 198 "return code: %d, old size = %i\n", rc, 199 ops.size); 200 else 201 P_INFO("os: old record size = %i stopped\n", 202 ops.size); 203 } 204 ops.size = new_size; 205 } 206 os_data->timestamp = get_clock(); 207 os_data->sync_count_2++; 208#ifdef APPLDATA_DEBUG 209 appldata_print_debug(os_data); 210#endif 211} 212 213 214/* 215 * appldata_os_init() 216 * 217 * init data, register ops 218 */ 219static int __init appldata_os_init(void) 220{ 221 int rc, max_size; 222 223 max_size = sizeof(struct appldata_os_data) + 224 (NR_CPUS * sizeof(struct appldata_os_per_cpu)); 225 if (max_size > APPLDATA_MAX_REC_SIZE) { 226 P_ERROR("Max. size of OS record = %i, bigger than maximum " 227 "record size (%i)\n", max_size, APPLDATA_MAX_REC_SIZE); 228 rc = -ENOMEM; 229 goto out; 230 } 231 P_DEBUG("max. sizeof(os) = %i, sizeof(os_cpu) = %lu\n", max_size, 232 sizeof(struct appldata_os_per_cpu)); 233 234 appldata_os_data = kzalloc(max_size, GFP_DMA); 235 if (appldata_os_data == NULL) { 236 P_ERROR("No memory for %s!\n", ops.name); 237 rc = -ENOMEM; 238 goto out; 239 } 240 241 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); 242 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, 243 os_cpu); 244 P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset); 245 246 ops.data = appldata_os_data; 247 ops.callback = &appldata_get_os_data; 248 rc = appldata_register_ops(&ops); 249 if (rc != 0) { 250 P_ERROR("Error registering ops, rc = %i\n", rc); 251 kfree(appldata_os_data); 252 } else { 253 P_DEBUG("%s-ops registered!\n", ops.name); 254 } 255out: 256 return rc; 257} 258 259/* 260 * appldata_os_exit() 261 * 262 * unregister ops 263 */ 264static void __exit appldata_os_exit(void) 265{ 266 appldata_unregister_ops(&ops); 267 kfree(appldata_os_data); 268 P_DEBUG("%s-ops unregistered!\n", ops.name); 269} 270 271 272module_init(appldata_os_init); 273module_exit(appldata_os_exit); 274 275MODULE_LICENSE("GPL"); 276MODULE_AUTHOR("Gerald Schaefer"); 277MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); 278