| 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 | (NR_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"); |