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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
3 * Collects data related to memory management.
4 *
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02005 * Copyright IBM Corp. 2003, 2006
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
Gerald Schaefer5b5dd212006-06-29 15:08:35 +02007 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/module.h>
11#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/errno.h>
13#include <linux/kernel_stat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/pagemap.h>
15#include <linux/swap.h>
Jeff Mahoneyf1a85822014-04-27 17:35:43 -040016#include <linux/slab.h>
Gerald Schaeferd3ae9422008-07-14 09:59:34 +020017#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19#include "appldata.h"
20
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
23
24/*
25 * Memory data
26 *
27 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
28 * the structure version (product ID, see appldata_base.c) needs to be changed
29 * as well and all documentation and z/VM applications using it must be
30 * updated.
31 *
32 * The record layout is documented in the Linux for zSeries Device Drivers
33 * book:
34 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
35 */
Sebastian Otta94f0fb2013-06-25 15:36:12 +020036struct appldata_mem_data {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 u64 timestamp;
38 u32 sync_count_1; /* after VM collected the record data, */
39 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
40 same. If not, the record has been updated on
41 the Linux side while VM was collecting the
42 (possibly corrupt) data */
43
44 u64 pgpgin; /* data read from disk */
45 u64 pgpgout; /* data written to disk */
46 u64 pswpin; /* pages swapped in */
47 u64 pswpout; /* pages swapped out */
48
49 u64 sharedram; /* sharedram is currently set to 0 */
50
51 u64 totalram; /* total main memory size */
52 u64 freeram; /* free main memory size */
53 u64 totalhigh; /* total high memory size */
54 u64 freehigh; /* free high memory size */
55
56 u64 bufferram; /* memory reserved for buffers, free cache */
57 u64 cached; /* size of (used) cache, w/o buffers */
58 u64 totalswap; /* total swap space size */
59 u64 freeswap; /* free swap space */
60
61// New in 2.6 -->
62 u64 pgalloc; /* page allocations */
63 u64 pgfault; /* page faults (major+minor) */
64 u64 pgmajfault; /* page faults (major only) */
65// <-- New in 2.6
66
Sebastian Otta94f0fb2013-06-25 15:36:12 +020067} __packed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070/*
71 * appldata_get_mem_data()
72 *
73 * gather memory data
74 */
75static void appldata_get_mem_data(void *data)
76{
77 /*
78 * don't put large structures on the stack, we are
Gerald Schaeferb1ad1712009-04-23 13:58:07 +020079 * serialized through the appldata_ops_mutex and can use static
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 */
81 static struct sysinfo val;
Christoph Lameterf8891e52006-06-30 01:55:45 -070082 unsigned long ev[NR_VM_EVENT_ITEMS];
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 struct appldata_mem_data *mem_data;
84
85 mem_data = data;
86 mem_data->sync_count_1++;
87
Christoph Lameterf8891e52006-06-30 01:55:45 -070088 all_vm_events(ev);
89 mem_data->pgpgin = ev[PGPGIN] >> 1;
90 mem_data->pgpgout = ev[PGPGOUT] >> 1;
91 mem_data->pswpin = ev[PSWPIN];
92 mem_data->pswpout = ev[PSWPOUT];
Al Virobb81e602007-03-14 09:04:41 +000093 mem_data->pgalloc = ev[PGALLOC_NORMAL];
Al Virobb81e602007-03-14 09:04:41 +000094 mem_data->pgalloc += ev[PGALLOC_DMA];
Christoph Lameterf8891e52006-06-30 01:55:45 -070095 mem_data->pgfault = ev[PGFAULT];
96 mem_data->pgmajfault = ev[PGMAJFAULT];
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 si_meminfo(&val);
99 mem_data->sharedram = val.sharedram;
100 mem_data->totalram = P2K(val.totalram);
101 mem_data->freeram = P2K(val.freeram);
102 mem_data->totalhigh = P2K(val.totalhigh);
103 mem_data->freehigh = P2K(val.freehigh);
104 mem_data->bufferram = P2K(val.bufferram);
Christoph Lameter347ce432006-06-30 01:55:35 -0700105 mem_data->cached = P2K(global_page_state(NR_FILE_PAGES)
106 - val.bufferram);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108 si_swapinfo(&val);
109 mem_data->totalswap = P2K(val.totalswap);
110 mem_data->freeswap = P2K(val.freeswap);
111
Heiko Carstens1aae0562013-01-30 09:49:40 +0100112 mem_data->timestamp = get_tod_clock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 mem_data->sync_count_2++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116
117static struct appldata_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 .name = "mem",
119 .record_nr = APPLDATA_RECORD_MEM_ID,
120 .size = sizeof(struct appldata_mem_data),
121 .callback = &appldata_get_mem_data,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 .owner = THIS_MODULE,
Gerald Schaefer5b5dd212006-06-29 15:08:35 +0200123 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124};
125
126
127/*
128 * appldata_mem_init()
129 *
130 * init_data, register ops
131 */
132static int __init appldata_mem_init(void)
133{
Sebastian Otta94f0fb2013-06-25 15:36:12 +0200134 int ret;
135
136 ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
137 if (!ops.data)
138 return -ENOMEM;
139
140 ret = appldata_register_ops(&ops);
141 if (ret)
142 kfree(ops.data);
143
144 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
147/*
148 * appldata_mem_exit()
149 *
150 * unregister ops
151 */
152static void __exit appldata_mem_exit(void)
153{
154 appldata_unregister_ops(&ops);
Sebastian Otta94f0fb2013-06-25 15:36:12 +0200155 kfree(ops.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
158
159module_init(appldata_mem_init);
160module_exit(appldata_mem_exit);
161
162MODULE_LICENSE("GPL");
163MODULE_AUTHOR("Gerald Schaefer");
164MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");