1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Data gathering module for Linux-VM Monitor Stream, Stage 1. 4 * Collects misc. OS related data (CPU utilization, running processes). 5 * 6 * Copyright IBM Corp. 2003, 2006 7 * 8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> 9 */ 10 11 #define KMSG_COMPONENT "appldata" 12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/slab.h> 17 #include <linux/errno.h> 18 #include <linux/kernel_stat.h> 19 #include <linux/netdevice.h> 20 #include <linux/sched.h> 21 #include <linux/sched/loadavg.h> 22 #include <linux/sched/stat.h> 23 #include <asm/appldata.h> 24 #include <asm/smp.h> 25 26 #include "appldata.h" 27 28 /* 29 * OS data 30 * 31 * This is accessed as binary data by z/VM. If changes to it can't be avoided, 32 * the structure version (product ID, see appldata_base.c) needs to be changed 33 * as well and all documentation and z/VM applications using it must be 34 * updated. 35 * 36 * The record layout is documented in the Linux for zSeries Device Drivers 37 * book: 38 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml 39 */ 40 struct appldata_os_per_cpu { 41 u32 per_cpu_user; /* timer ticks spent in user mode */ 42 u32 per_cpu_nice; /* ... spent with modified priority */ 43 u32 per_cpu_system; /* ... spent in kernel mode */ 44 u32 per_cpu_idle; /* ... spent in idle mode */ 45 46 /* New in 2.6 */ 47 u32 per_cpu_irq; /* ... spent in interrupts */ 48 u32 per_cpu_softirq; /* ... spent in softirqs */ 49 u32 per_cpu_iowait; /* ... spent while waiting for I/O */ 50 51 /* New in modification level 01 */ 52 u32 per_cpu_steal; /* ... stolen by hypervisor */ 53 u32 cpu_id; /* number of this CPU */ 54 } __attribute__((packed)); 55 56 struct appldata_os_data { 57 u64 timestamp; 58 u32 sync_count_1; /* after VM collected the record data, */ 59 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the 60 same. If not, the record has been updated on 61 the Linux side while VM was collecting the 62 (possibly corrupt) data */ 63 64 u32 nr_cpus; /* number of (virtual) CPUs */ 65 u32 per_cpu_size; /* size of the per-cpu data struct */ 66 u32 cpu_offset; /* offset of the first per-cpu data struct */ 67 68 u32 nr_running; /* number of runnable threads */ 69 u32 nr_threads; /* number of threads */ 70 u32 avenrun[3]; /* average nr. of running processes during */ 71 /* the last 1, 5 and 15 minutes */ 72 73 /* New in 2.6 */ 74 u32 nr_iowait; /* number of blocked threads 75 (waiting for I/O) */ 76 77 /* per cpu data */ 78 struct appldata_os_per_cpu os_cpu[]; 79 } __attribute__((packed)); 80 81 static struct appldata_os_data *appldata_os_data; 82 83 static struct appldata_ops ops = { 84 .name = "os", 85 .record_nr = APPLDATA_RECORD_OS_ID, 86 .owner = THIS_MODULE, 87 .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */ 88 }; 89 90 91 /* 92 * appldata_get_os_data() 93 * 94 * gather OS data 95 */ 96 static void appldata_get_os_data(void *data) 97 { 98 int i, j, rc; 99 struct appldata_os_data *os_data; 100 unsigned int new_size; 101 102 os_data = data; 103 os_data->sync_count_1++; 104 105 os_data->nr_threads = nr_threads; 106 os_data->nr_running = nr_running(); 107 os_data->nr_iowait = nr_iowait(); 108 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); 109 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); 110 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); 111 112 j = 0; 113 for_each_online_cpu(i) { 114 os_data->os_cpu[j].per_cpu_user = 115 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]); 116 os_data->os_cpu[j].per_cpu_nice = 117 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]); 118 os_data->os_cpu[j].per_cpu_system = 119 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]); 120 os_data->os_cpu[j].per_cpu_idle = 121 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]); 122 os_data->os_cpu[j].per_cpu_irq = 123 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]); 124 os_data->os_cpu[j].per_cpu_softirq = 125 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]); 126 os_data->os_cpu[j].per_cpu_iowait = 127 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]); 128 os_data->os_cpu[j].per_cpu_steal = 129 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]); 130 os_data->os_cpu[j].cpu_id = i; 131 j++; 132 } 133 134 os_data->nr_cpus = j; 135 136 new_size = sizeof(struct appldata_os_data) + 137 (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); 138 if (ops.size != new_size) { 139 if (ops.active) { 140 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 141 APPLDATA_START_INTERVAL_REC, 142 (unsigned long) ops.data, new_size, 143 ops.mod_lvl); 144 if (rc != 0) 145 pr_err("Starting a new OS data collection " 146 "failed with rc=%d\n", rc); 147 148 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 149 APPLDATA_STOP_REC, 150 (unsigned long) ops.data, ops.size, 151 ops.mod_lvl); 152 if (rc != 0) 153 pr_err("Stopping a faulty OS data " 154 "collection failed with rc=%d\n", rc); 155 } 156 ops.size = new_size; 157 } 158 os_data->timestamp = get_tod_clock(); 159 os_data->sync_count_2++; 160 } 161 162 163 /* 164 * appldata_os_init() 165 * 166 * init data, register ops 167 */ 168 static int __init appldata_os_init(void) 169 { 170 int rc, max_size; 171 172 max_size = sizeof(struct appldata_os_data) + 173 (num_possible_cpus() * sizeof(struct appldata_os_per_cpu)); 174 if (max_size > APPLDATA_MAX_REC_SIZE) { 175 pr_err("Maximum OS record size %i exceeds the maximum " 176 "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE); 177 rc = -ENOMEM; 178 goto out; 179 } 180 181 appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA); 182 if (appldata_os_data == NULL) { 183 rc = -ENOMEM; 184 goto out; 185 } 186 187 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); 188 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, 189 os_cpu); 190 191 ops.data = appldata_os_data; 192 ops.callback = &appldata_get_os_data; 193 rc = appldata_register_ops(&ops); 194 if (rc != 0) 195 kfree(appldata_os_data); 196 out: 197 return rc; 198 } 199 200 /* 201 * appldata_os_exit() 202 * 203 * unregister ops 204 */ 205 static void __exit appldata_os_exit(void) 206 { 207 appldata_unregister_ops(&ops); 208 kfree(appldata_os_data); 209 } 210 211 212 module_init(appldata_os_init); 213 module_exit(appldata_os_exit); 214 215 MODULE_LICENSE("GPL"); 216 MODULE_AUTHOR("Gerald Schaefer"); 217 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); 218