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Linux/arch/s390/appldata/appldata_os.c

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  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 

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