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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
4 * Collects data related to memory management.
5 *
6 * Copyright IBM Corp. 2003, 2006
7 *
8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/kernel_stat.h>
15#include <linux/pagemap.h>
16#include <linux/swap.h>
17#include <linux/slab.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 */
33struct appldata_mem_data {
34 u64 timestamp;
35 u32 sync_count_1; /* after VM collected the record data, */
36 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
37 same. If not, the record has been updated on
38 the Linux side while VM was collecting the
39 (possibly corrupt) data */
40
41 u64 pgpgin; /* data read from disk */
42 u64 pgpgout; /* data written to disk */
43 u64 pswpin; /* pages swapped in */
44 u64 pswpout; /* pages swapped out */
45
46 u64 sharedram; /* sharedram is currently set to 0 */
47
48 u64 totalram; /* total main memory size */
49 u64 freeram; /* free main memory size */
50 u64 totalhigh; /* total high memory size */
51 u64 freehigh; /* free high memory size */
52
53 u64 bufferram; /* memory reserved for buffers, free cache */
54 u64 cached; /* size of (used) cache, w/o buffers */
55 u64 totalswap; /* total swap space size */
56 u64 freeswap; /* free swap space */
57
58// New in 2.6 -->
59 u64 pgalloc; /* page allocations */
60 u64 pgfault; /* page faults (major+minor) */
61 u64 pgmajfault; /* page faults (major only) */
62// <-- New in 2.6
63
64} __packed;
65
66
67/*
68 * appldata_get_mem_data()
69 *
70 * gather memory data
71 */
72static void appldata_get_mem_data(void *data)
73{
74 /*
75 * don't put large structures on the stack, we are
76 * serialized through the appldata_ops_mutex and can use static
77 */
78 static struct sysinfo val;
79 unsigned long ev[NR_VM_EVENT_ITEMS];
80 struct appldata_mem_data *mem_data;
81
82 mem_data = data;
83 mem_data->sync_count_1++;
84
85 all_vm_events(ev);
86 mem_data->pgpgin = ev[PGPGIN] >> 1;
87 mem_data->pgpgout = ev[PGPGOUT] >> 1;
88 mem_data->pswpin = ev[PSWPIN];
89 mem_data->pswpout = ev[PSWPOUT];
90 mem_data->pgalloc = ev[PGALLOC_NORMAL];
91 mem_data->pgalloc += ev[PGALLOC_DMA];
92 mem_data->pgfault = ev[PGFAULT];
93 mem_data->pgmajfault = ev[PGMAJFAULT];
94
95 si_meminfo(&val);
96 mem_data->sharedram = val.sharedram;
97 mem_data->totalram = P2K(val.totalram);
98 mem_data->freeram = P2K(val.freeram);
99 mem_data->totalhigh = P2K(val.totalhigh);
100 mem_data->freehigh = P2K(val.freehigh);
101 mem_data->bufferram = P2K(val.bufferram);
102 mem_data->cached = P2K(global_node_page_state(NR_FILE_PAGES)
103 - val.bufferram);
104
105 si_swapinfo(&val);
106 mem_data->totalswap = P2K(val.totalswap);
107 mem_data->freeswap = P2K(val.freeswap);
108
109 mem_data->timestamp = get_tod_clock();
110 mem_data->sync_count_2++;
111}
112
113
114static struct appldata_ops ops = {
115 .name = "mem",
116 .record_nr = APPLDATA_RECORD_MEM_ID,
117 .size = sizeof(struct appldata_mem_data),
118 .callback = &appldata_get_mem_data,
119 .owner = THIS_MODULE,
120 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
121};
122
123
124/*
125 * appldata_mem_init()
126 *
127 * init_data, register ops
128 */
129static int __init appldata_mem_init(void)
130{
131 int ret;
132
133 ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
134 if (!ops.data)
135 return -ENOMEM;
136
137 ret = appldata_register_ops(&ops);
138 if (ret)
139 kfree(ops.data);
140
141 return ret;
142}
143
144/*
145 * appldata_mem_exit()
146 *
147 * unregister ops
148 */
149static void __exit appldata_mem_exit(void)
150{
151 appldata_unregister_ops(&ops);
152 kfree(ops.data);
153}
154
155
156module_init(appldata_mem_init);
157module_exit(appldata_mem_exit);
158
159MODULE_LICENSE("GPL");
160MODULE_AUTHOR("Gerald Schaefer");
161MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
4 * Collects data related to memory management.
5 *
6 * Copyright IBM Corp. 2003, 2006
7 *
8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/kernel_stat.h>
15#include <linux/pagemap.h>
16#include <linux/swap.h>
17#include <linux/slab.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 */
37struct 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} __packed;
69
70
71/*
72 * appldata_get_mem_data()
73 *
74 * gather memory data
75 */
76static 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 mem_data->pgalloc += ev[PGALLOC_DMA];
96 mem_data->pgfault = ev[PGFAULT];
97 mem_data->pgmajfault = ev[PGMAJFAULT];
98
99 si_meminfo(&val);
100 mem_data->sharedram = val.sharedram;
101 mem_data->totalram = P2K(val.totalram);
102 mem_data->freeram = P2K(val.freeram);
103 mem_data->totalhigh = P2K(val.totalhigh);
104 mem_data->freehigh = P2K(val.freehigh);
105 mem_data->bufferram = P2K(val.bufferram);
106 mem_data->cached = P2K(global_node_page_state(NR_FILE_PAGES)
107 - val.bufferram);
108
109 si_swapinfo(&val);
110 mem_data->totalswap = P2K(val.totalswap);
111 mem_data->freeswap = P2K(val.freeswap);
112
113 mem_data->timestamp = get_tod_clock();
114 mem_data->sync_count_2++;
115}
116
117
118static struct appldata_ops ops = {
119 .name = "mem",
120 .record_nr = APPLDATA_RECORD_MEM_ID,
121 .size = sizeof(struct appldata_mem_data),
122 .callback = &appldata_get_mem_data,
123 .owner = THIS_MODULE,
124 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
125};
126
127
128/*
129 * appldata_mem_init()
130 *
131 * init_data, register ops
132 */
133static int __init appldata_mem_init(void)
134{
135 int ret;
136
137 ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
138 if (!ops.data)
139 return -ENOMEM;
140
141 ret = appldata_register_ops(&ops);
142 if (ret)
143 kfree(ops.data);
144
145 return ret;
146}
147
148/*
149 * appldata_mem_exit()
150 *
151 * unregister ops
152 */
153static void __exit appldata_mem_exit(void)
154{
155 appldata_unregister_ops(&ops);
156 kfree(ops.data);
157}
158
159
160module_init(appldata_mem_init);
161module_exit(appldata_mem_exit);
162
163MODULE_LICENSE("GPL");
164MODULE_AUTHOR("Gerald Schaefer");
165MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");