2 * arch/s390/appldata/appldata_mem.c
4 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
5 * Collects data related to memory management.
7 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
9 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/errno.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/pagemap.h>
18 #include <linux/swap.h>
24 #define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
29 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
30 * the structure version (product ID, see appldata_base.c) needs to be changed
31 * as well and all documentation and z/VM applications using it must be
34 * The record layout is documented in the Linux for zSeries Device Drivers
36 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
38 static struct appldata_mem_data {
40 u32 sync_count_1; /* after VM collected the record data, */
41 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
42 same. If not, the record has been updated on
43 the Linux side while VM was collecting the
44 (possibly corrupt) data */
46 u64 pgpgin; /* data read from disk */
47 u64 pgpgout; /* data written to disk */
48 u64 pswpin; /* pages swapped in */
49 u64 pswpout; /* pages swapped out */
51 u64 sharedram; /* sharedram is currently set to 0 */
53 u64 totalram; /* total main memory size */
54 u64 freeram; /* free main memory size */
55 u64 totalhigh; /* total high memory size */
56 u64 freehigh; /* free high memory size */
58 u64 bufferram; /* memory reserved for buffers, free cache */
59 u64 cached; /* size of (used) cache, w/o buffers */
60 u64 totalswap; /* total swap space size */
61 u64 freeswap; /* free swap space */
64 u64 pgalloc; /* page allocations */
65 u64 pgfault; /* page faults (major+minor) */
66 u64 pgmajfault; /* page faults (major only) */
69 } __attribute__((packed)) appldata_mem_data;
73 * appldata_get_mem_data()
77 static void appldata_get_mem_data(void *data)
80 * don't put large structures on the stack, we are
81 * serialized through the appldata_ops_lock and can use static
83 static struct sysinfo val;
84 unsigned long ev[NR_VM_EVENT_ITEMS];
85 struct appldata_mem_data *mem_data;
88 mem_data->sync_count_1++;
91 mem_data->pgpgin = ev[PGPGIN] >> 1;
92 mem_data->pgpgout = ev[PGPGOUT] >> 1;
93 mem_data->pswpin = ev[PSWPIN];
94 mem_data->pswpout = ev[PSWPOUT];
95 mem_data->pgalloc = ev[PGALLOC_NORMAL];
96 #ifdef CONFIG_ZONE_DMA
97 mem_data->pgalloc += ev[PGALLOC_DMA];
99 mem_data->pgfault = ev[PGFAULT];
100 mem_data->pgmajfault = ev[PGMAJFAULT];
103 mem_data->sharedram = val.sharedram;
104 mem_data->totalram = P2K(val.totalram);
105 mem_data->freeram = P2K(val.freeram);
106 mem_data->totalhigh = P2K(val.totalhigh);
107 mem_data->freehigh = P2K(val.freehigh);
108 mem_data->bufferram = P2K(val.bufferram);
109 mem_data->cached = P2K(global_page_state(NR_FILE_PAGES)
113 mem_data->totalswap = P2K(val.totalswap);
114 mem_data->freeswap = P2K(val.freeswap);
116 mem_data->timestamp = get_clock();
117 mem_data->sync_count_2++;
121 static struct appldata_ops ops = {
123 .record_nr = APPLDATA_RECORD_MEM_ID,
124 .size = sizeof(struct appldata_mem_data),
125 .callback = &appldata_get_mem_data,
126 .data = &appldata_mem_data,
127 .owner = THIS_MODULE,
128 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
133 * appldata_mem_init()
135 * init_data, register ops
137 static int __init appldata_mem_init(void)
139 return appldata_register_ops(&ops);
143 * appldata_mem_exit()
147 static void __exit appldata_mem_exit(void)
149 appldata_unregister_ops(&ops);
153 module_init(appldata_mem_init);
154 module_exit(appldata_mem_exit);
156 MODULE_LICENSE("GPL");
157 MODULE_AUTHOR("Gerald Schaefer");
158 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");