1 /* 2 * Data gathering module for Linux-VM Monitor Stream, Stage 1. 3 * Collects misc. OS related data (CPU utilization, running processes). 4 * 5 * Copyright IBM Corp. 2003, 2006 6 * 7 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> 8 */ 9 10 #define KMSG_COMPONENT "appldata" 11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 12 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> 22 23 #include "appldata.h" 24 25 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 /* 93 * appldata_get_os_data() 94 * 95 * gather OS data 96 */ 97 static void appldata_get_os_data(void *data) 98 { 99 int i, j, rc; 100 struct appldata_os_data *os_data; 101 unsigned int new_size; 102 103 os_data = data; 104 os_data->sync_count_1++; 105 106 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); 112 113 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++; 133 } 134 135 os_data->nr_cpus = j; 136 137 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); 148 149 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); 156 } 157 ops.size = new_size; 158 } 159 os_data->timestamp = get_tod_clock(); 160 os_data->sync_count_2++; 161 } 162 163 164 /* 165 * appldata_os_init() 166 * 167 * init data, register ops 168 */ 169 static int __init appldata_os_init(void) 170 { 171 int rc, max_size; 172 173 max_size = sizeof(struct appldata_os_data) + 174 (num_possible_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; 180 } 181 182 appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA); 183 if (appldata_os_data == NULL) { 184 rc = -ENOMEM; 185 goto out; 186 } 187 188 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); 191 192 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; 199 } 200 201 /* 202 * appldata_os_exit() 203 * 204 * unregister ops 205 */ 206 static void __exit appldata_os_exit(void) 207 { 208 appldata_unregister_ops(&ops); 209 kfree(appldata_os_data); 210 } 211 212 213 module_init(appldata_os_init); 214 module_exit(appldata_os_exit); 215 216 MODULE_LICENSE("GPL"); 217 MODULE_AUTHOR("Gerald Schaefer"); 218 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); 219