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 struct appldata_os_per_cpu { 37 u32 per_cpu_user; /* timer ticks spent in user mode */ 38 u32 per_cpu_nice; /* ... spent with modified priority */ 39 u32 per_cpu_system; /* ... spent in kernel mode */ 40 u32 per_cpu_idle; /* ... spent in idle mode */ 41 42 /* New in 2.6 */ 43 u32 per_cpu_irq; /* ... spent in interrupts */ 44 u32 per_cpu_softirq; /* ... spent in softirqs */ 45 u32 per_cpu_iowait; /* ... spent while waiting for I/O */ 46 47 /* New in modification level 01 */ 48 u32 per_cpu_steal; /* ... stolen by hypervisor */ 49 u32 cpu_id; /* number of this CPU */ 50 } __attribute__((packed)); 51 52 struct appldata_os_data { 53 u64 timestamp; 54 u32 sync_count_1; /* after VM collected the record data, */ 55 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the 56 same. If not, the record has been updated on 57 the Linux side while VM was collecting the 58 (possibly corrupt) data */ 59 60 u32 nr_cpus; /* number of (virtual) CPUs */ 61 u32 per_cpu_size; /* size of the per-cpu data struct */ 62 u32 cpu_offset; /* offset of the first per-cpu data struct */ 63 64 u32 nr_running; /* number of runnable threads */ 65 u32 nr_threads; /* number of threads */ 66 u32 avenrun[3]; /* average nr. of running processes during */ 67 /* the last 1, 5 and 15 minutes */ 68 69 /* New in 2.6 */ 70 u32 nr_iowait; /* number of blocked threads 71 (waiting for I/O) */ 72 73 /* per cpu data */ 74 struct appldata_os_per_cpu os_cpu[]; 75 } __attribute__((packed)); 76 77 static struct appldata_os_data *appldata_os_data; 78 79 static struct appldata_ops ops = { 80 .name = "os", 81 .record_nr = APPLDATA_RECORD_OS_ID, 82 .owner = THIS_MODULE, 83 .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */ 84 }; 85 86 87 /* 88 * appldata_get_os_data() 89 * 90 * gather OS data 91 */ 92 static void appldata_get_os_data(void *data) 93 { 94 int i, j, rc; 95 struct appldata_os_data *os_data; 96 unsigned int new_size; 97 98 os_data = data; 99 os_data->sync_count_1++; 100 101 os_data->nr_threads = nr_threads; 102 os_data->nr_running = nr_running(); 103 os_data->nr_iowait = nr_iowait(); 104 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); 105 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); 106 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); 107 108 j = 0; 109 for_each_online_cpu(i) { 110 os_data->os_cpu[j].per_cpu_user = 111 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]); 112 os_data->os_cpu[j].per_cpu_nice = 113 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]); 114 os_data->os_cpu[j].per_cpu_system = 115 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]); 116 os_data->os_cpu[j].per_cpu_idle = 117 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]); 118 os_data->os_cpu[j].per_cpu_irq = 119 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]); 120 os_data->os_cpu[j].per_cpu_softirq = 121 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]); 122 os_data->os_cpu[j].per_cpu_iowait = 123 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]); 124 os_data->os_cpu[j].per_cpu_steal = 125 nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]); 126 os_data->os_cpu[j].cpu_id = i; 127 j++; 128 } 129 130 os_data->nr_cpus = j; 131 132 new_size = sizeof(struct appldata_os_data) + 133 (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); 134 if (ops.size != new_size) { 135 if (ops.active) { 136 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 137 APPLDATA_START_INTERVAL_REC, 138 (unsigned long) ops.data, new_size, 139 ops.mod_lvl); 140 if (rc != 0) 141 pr_err("Starting a new OS data collection " 142 "failed with rc=%d\n", rc); 143 144 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 145 APPLDATA_STOP_REC, 146 (unsigned long) ops.data, ops.size, 147 ops.mod_lvl); 148 if (rc != 0) 149 pr_err("Stopping a faulty OS data " 150 "collection failed with rc=%d\n", rc); 151 } 152 ops.size = new_size; 153 } 154 os_data->timestamp = get_tod_clock(); 155 os_data->sync_count_2++; 156 } 157 158 159 /* 160 * appldata_os_init() 161 * 162 * init data, register ops 163 */ 164 static int __init appldata_os_init(void) 165 { 166 int rc, max_size; 167 168 max_size = sizeof(struct appldata_os_data) + 169 (num_possible_cpus() * sizeof(struct appldata_os_per_cpu)); 170 if (max_size > APPLDATA_MAX_REC_SIZE) { 171 pr_err("Maximum OS record size %i exceeds the maximum " 172 "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE); 173 rc = -ENOMEM; 174 goto out; 175 } 176 177 appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA); 178 if (appldata_os_data == NULL) { 179 rc = -ENOMEM; 180 goto out; 181 } 182 183 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); 184 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, 185 os_cpu); 186 187 ops.data = appldata_os_data; 188 ops.callback = &appldata_get_os_data; 189 rc = appldata_register_ops(&ops); 190 if (rc != 0) 191 kfree(appldata_os_data); 192 out: 193 return rc; 194 } 195 196 /* 197 * appldata_os_exit() 198 * 199 * unregister ops 200 */ 201 static void __exit appldata_os_exit(void) 202 { 203 appldata_unregister_ops(&ops); 204 kfree(appldata_os_data); 205 } 206 207 208 module_init(appldata_os_init); 209 module_exit(appldata_os_exit); 210 211 MODULE_LICENSE("GPL"); 212 MODULE_AUTHOR("Gerald Schaefer"); 213 MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); 214