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/arch/s390/appldata/appldata_os.c

https://bitbucket.org/evzijst/gittest
C | 241 lines | 159 code | 35 blank | 47 comment | 7 complexity | 8c14c373249bdc9c12a95aafaa037a24 MD5 | raw file
  1/*
  2 * arch/s390/appldata/appldata_os.c
  3 *
  4 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
  5 * Collects misc. OS related data (CPU utilization, running processes).
  6 *
  7 * Copyright (C) 2003 IBM Corporation, IBM Deutschland Entwicklung GmbH.
  8 *
  9 * Author: Gerald Schaefer <geraldsc@de.ibm.com>
 10 */
 11
 12#include <linux/config.h>
 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/smp.h>
 21
 22#include "appldata.h"
 23
 24
 25#define MY_PRINT_NAME	"appldata_os"		/* for debug messages, etc. */
 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 */
 41struct 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// <-- New in 2.6
 52};
 53
 54struct appldata_os_data {
 55	u64 timestamp;
 56	u32 sync_count_1;	/* after VM collected the record data, */
 57	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
 58				   same. If not, the record has been updated on
 59				   the Linux side while VM was collecting the
 60				   (possibly corrupt) data */
 61
 62	u32 nr_cpus;		/* number of (virtual) CPUs        */
 63	u32 per_cpu_size;	/* size of the per-cpu data struct */
 64	u32 cpu_offset;		/* offset of the first per-cpu data struct */
 65
 66	u32 nr_running;		/* number of runnable threads      */
 67	u32 nr_threads;		/* number of threads               */
 68	u32 avenrun[3];		/* average nr. of running processes during */
 69				/* the last 1, 5 and 15 minutes */
 70
 71// New in 2.6 -->
 72	u32 nr_iowait;		/* number of blocked threads
 73				   (waiting for I/O)               */
 74// <-- New in 2.6
 75
 76	/* per cpu data */
 77	struct appldata_os_per_cpu os_cpu[0];
 78};
 79
 80static struct appldata_os_data *appldata_os_data;
 81
 82
 83static inline void appldata_print_debug(struct appldata_os_data *os_data)
 84{
 85	int a0, a1, a2, i;
 86
 87	P_DEBUG("--- OS - RECORD ---\n");
 88	P_DEBUG("nr_threads   = %u\n", os_data->nr_threads);
 89	P_DEBUG("nr_running   = %u\n", os_data->nr_running);
 90	P_DEBUG("nr_iowait    = %u\n", os_data->nr_iowait);
 91	P_DEBUG("avenrun(int) = %8x / %8x / %8x\n", os_data->avenrun[0],
 92		os_data->avenrun[1], os_data->avenrun[2]);
 93	a0 = os_data->avenrun[0];
 94	a1 = os_data->avenrun[1];
 95	a2 = os_data->avenrun[2];
 96	P_DEBUG("avenrun(float) = %d.%02d / %d.%02d / %d.%02d\n",
 97		LOAD_INT(a0), LOAD_FRAC(a0), LOAD_INT(a1), LOAD_FRAC(a1),
 98		LOAD_INT(a2), LOAD_FRAC(a2));
 99
100	P_DEBUG("nr_cpus = %u\n", os_data->nr_cpus);
101	for (i = 0; i < os_data->nr_cpus; i++) {
102		P_DEBUG("cpu%u : user = %u, nice = %u, system = %u, "
103			"idle = %u, irq = %u, softirq = %u, iowait = %u\n",
104				i,
105				os_data->os_cpu[i].per_cpu_user,
106				os_data->os_cpu[i].per_cpu_nice,
107				os_data->os_cpu[i].per_cpu_system,
108				os_data->os_cpu[i].per_cpu_idle,
109				os_data->os_cpu[i].per_cpu_irq,
110				os_data->os_cpu[i].per_cpu_softirq,
111				os_data->os_cpu[i].per_cpu_iowait);
112	}
113
114	P_DEBUG("sync_count_1 = %u\n", os_data->sync_count_1);
115	P_DEBUG("sync_count_2 = %u\n", os_data->sync_count_2);
116	P_DEBUG("timestamp    = %lX\n", os_data->timestamp);
117}
118
119/*
120 * appldata_get_os_data()
121 *
122 * gather OS data
123 */
124static void appldata_get_os_data(void *data)
125{
126	int i, j;
127	struct appldata_os_data *os_data;
128
129	os_data = data;
130	os_data->sync_count_1++;
131
132	os_data->nr_cpus = num_online_cpus();
133
134	os_data->nr_threads = nr_threads;
135	os_data->nr_running = nr_running();
136	os_data->nr_iowait  = nr_iowait();
137	os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
138	os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
139	os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
140
141	j = 0;
142	for_each_online_cpu(i) {
143		os_data->os_cpu[j].per_cpu_user =
144					kstat_cpu(i).cpustat.user;
145		os_data->os_cpu[j].per_cpu_nice =
146					kstat_cpu(i).cpustat.nice;
147		os_data->os_cpu[j].per_cpu_system =
148					kstat_cpu(i).cpustat.system;
149		os_data->os_cpu[j].per_cpu_idle =
150					kstat_cpu(i).cpustat.idle;
151		os_data->os_cpu[j].per_cpu_irq =
152					kstat_cpu(i).cpustat.irq;
153		os_data->os_cpu[j].per_cpu_softirq =
154					kstat_cpu(i).cpustat.softirq;
155		os_data->os_cpu[j].per_cpu_iowait =
156					kstat_cpu(i).cpustat.iowait;
157		j++;
158	}
159
160	os_data->timestamp = get_clock();
161	os_data->sync_count_2++;
162#ifdef APPLDATA_DEBUG
163	appldata_print_debug(os_data);
164#endif
165}
166
167
168static struct appldata_ops ops = {
169	.ctl_nr    = CTL_APPLDATA_OS,
170	.name	   = "os",
171	.record_nr = APPLDATA_RECORD_OS_ID,
172	.callback  = &appldata_get_os_data,
173	.owner     = THIS_MODULE,
174};
175
176
177/*
178 * appldata_os_init()
179 *
180 * init data, register ops
181 */
182static int __init appldata_os_init(void)
183{
184	int rc, size;
185
186	size = sizeof(struct appldata_os_data) +
187		(NR_CPUS * sizeof(struct appldata_os_per_cpu));
188	if (size > APPLDATA_MAX_REC_SIZE) {
189		P_ERROR("Size of record = %i, bigger than maximum (%i)!\n",
190			size, APPLDATA_MAX_REC_SIZE);
191		rc = -ENOMEM;
192		goto out;
193	}
194	P_DEBUG("sizeof(os) = %i, sizeof(os_cpu) = %lu\n", size,
195		sizeof(struct appldata_os_per_cpu));
196
197	appldata_os_data = kmalloc(size, GFP_DMA);
198	if (appldata_os_data == NULL) {
199		P_ERROR("No memory for %s!\n", ops.name);
200		rc = -ENOMEM;
201		goto out;
202	}
203	memset(appldata_os_data, 0, size);
204
205	appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu);
206	appldata_os_data->cpu_offset   = offsetof(struct appldata_os_data,
207							os_cpu);
208	P_DEBUG("cpu offset = %u\n", appldata_os_data->cpu_offset);
209
210	ops.data = appldata_os_data;
211	ops.size = size;
212	rc = appldata_register_ops(&ops);
213	if (rc != 0) {
214		P_ERROR("Error registering ops, rc = %i\n", rc);
215		kfree(appldata_os_data);
216	} else {
217		P_DEBUG("%s-ops registered!\n", ops.name);
218	}
219out:
220	return rc;
221}
222
223/*
224 * appldata_os_exit()
225 *
226 * unregister ops
227 */
228static void __exit appldata_os_exit(void)
229{
230	appldata_unregister_ops(&ops);
231	kfree(appldata_os_data);
232	P_DEBUG("%s-ops unregistered!\n", ops.name);
233}
234
235
236module_init(appldata_os_init);
237module_exit(appldata_os_exit);
238
239MODULE_LICENSE("GPL");
240MODULE_AUTHOR("Gerald Schaefer");
241MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics");