1 /*
2 * arch/s390/appldata/appldata_mem.c
3 *
4 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
5 * Collects data related to memory management.
6 *
7 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
8 *
9 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/errno.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/pagemap.h>
17 #include <linux/swap.h>
18 #include <asm/io.h>
19
20 #include "appldata.h"
21
22
23 #define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
24
25 /*
26 * Memory data
27 *
28 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
29 * the structure version (product ID, see appldata_base.c) needs to be changed
30 * as well and all documentation and z/VM applications using it must be
31 * updated.
32 *
33 * The record layout is documented in the Linux for zSeries Device Drivers
34 * book:
35 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
36 */
37 static struct appldata_mem_data {
38 u64 timestamp;
39 u32 sync_count_1; /* after VM collected the record data, */
40 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
41 same. If not, the record has been updated on
42 the Linux side while VM was collecting the
43 (possibly corrupt) data */
44
45 u64 pgpgin; /* data read from disk */
46 u64 pgpgout; /* data written to disk */
47 u64 pswpin; /* pages swapped in */
48 u64 pswpout; /* pages swapped out */
49
50 u64 sharedram; /* sharedram is currently set to 0 */
51
52 u64 totalram; /* total main memory size */
53 u64 freeram; /* free main memory size */
54 u64 totalhigh; /* total high memory size */
55 u64 freehigh; /* free high memory size */
56
57 u64 bufferram; /* memory reserved for buffers, free cache */
58 u64 cached; /* size of (used) cache, w/o buffers */
59 u64 totalswap; /* total swap space size */
60 u64 freeswap; /* free swap space */
61
62 // New in 2.6 -->
63 u64 pgalloc; /* page allocations */
64 u64 pgfault; /* page faults (major+minor) */
65 u64 pgmajfault; /* page faults (major only) */
66 // <-- New in 2.6
67
68 } __attribute__((packed)) appldata_mem_data;
69
70
71 /*
72 * appldata_get_mem_data()
73 *
74 * gather memory data
75 */
appldata_get_mem_data(void * data)76 static void appldata_get_mem_data(void *data)
77 {
78 /*
79 * don't put large structures on the stack, we are
80 * serialized through the appldata_ops_mutex and can use static
81 */
82 static struct sysinfo val;
83 unsigned long ev[NR_VM_EVENT_ITEMS];
84 struct appldata_mem_data *mem_data;
85
86 mem_data = data;
87 mem_data->sync_count_1++;
88
89 all_vm_events(ev);
90 mem_data->pgpgin = ev[PGPGIN] >> 1;
91 mem_data->pgpgout = ev[PGPGOUT] >> 1;
92 mem_data->pswpin = ev[PSWPIN];
93 mem_data->pswpout = ev[PSWPOUT];
94 mem_data->pgalloc = ev[PGALLOC_NORMAL];
95 #ifdef CONFIG_ZONE_DMA
96 mem_data->pgalloc += ev[PGALLOC_DMA];
97 #endif
98 mem_data->pgfault = ev[PGFAULT];
99 mem_data->pgmajfault = ev[PGMAJFAULT];
100
101 si_meminfo(&val);
102 mem_data->sharedram = val.sharedram;
103 mem_data->totalram = P2K(val.totalram);
104 mem_data->freeram = P2K(val.freeram);
105 mem_data->totalhigh = P2K(val.totalhigh);
106 mem_data->freehigh = P2K(val.freehigh);
107 mem_data->bufferram = P2K(val.bufferram);
108 mem_data->cached = P2K(global_page_state(NR_FILE_PAGES)
109 - val.bufferram);
110
111 si_swapinfo(&val);
112 mem_data->totalswap = P2K(val.totalswap);
113 mem_data->freeswap = P2K(val.freeswap);
114
115 mem_data->timestamp = get_clock();
116 mem_data->sync_count_2++;
117 }
118
119
120 static struct appldata_ops ops = {
121 .name = "mem",
122 .record_nr = APPLDATA_RECORD_MEM_ID,
123 .size = sizeof(struct appldata_mem_data),
124 .callback = &appldata_get_mem_data,
125 .data = &appldata_mem_data,
126 .owner = THIS_MODULE,
127 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
128 };
129
130
131 /*
132 * appldata_mem_init()
133 *
134 * init_data, register ops
135 */
appldata_mem_init(void)136 static int __init appldata_mem_init(void)
137 {
138 return appldata_register_ops(&ops);
139 }
140
141 /*
142 * appldata_mem_exit()
143 *
144 * unregister ops
145 */
appldata_mem_exit(void)146 static void __exit appldata_mem_exit(void)
147 {
148 appldata_unregister_ops(&ops);
149 }
150
151
152 module_init(appldata_mem_init);
153 module_exit(appldata_mem_exit);
154
155 MODULE_LICENSE("GPL");
156 MODULE_AUTHOR("Gerald Schaefer");
157 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
158