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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Gerald Schaefer5b5dd212006-06-29 15:08:35 +02007 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
Gerald Schaefer5b5dd212006-06-29 15:08:35 +02009 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/module.h>
13#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/errno.h>
15#include <linux/kernel_stat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/pagemap.h>
17#include <linux/swap.h>
Gerald Schaeferd3ae9422008-07-14 09:59:34 +020018#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20#include "appldata.h"
21
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#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 */
Heiko Carstens2b67fc42007-02-05 21:16:47 +010037static struct appldata_mem_data {
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 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
Gerald Schaeferf26d5832005-06-04 15:43:33 -070068} __attribute__((packed)) appldata_mem_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/*
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
Gerald Schaeferb1ad1712009-04-23 13:58:07 +020080 * serialized through the appldata_ops_mutex and can use static
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 */
82 static struct sysinfo val;
Christoph Lameterf8891e52006-06-30 01:55:45 -070083 unsigned long ev[NR_VM_EVENT_ITEMS];
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 struct appldata_mem_data *mem_data;
85
86 mem_data = data;
87 mem_data->sync_count_1++;
88
Christoph Lameterf8891e52006-06-30 01:55:45 -070089 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];
Al Virobb81e602007-03-14 09:04:41 +000094 mem_data->pgalloc = ev[PGALLOC_NORMAL];
Al Virobb81e602007-03-14 09:04:41 +000095 mem_data->pgalloc += ev[PGALLOC_DMA];
Christoph Lameterf8891e52006-06-30 01:55:45 -070096 mem_data->pgfault = ev[PGFAULT];
97 mem_data->pgmajfault = ev[PGMAJFAULT];
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
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);
Christoph Lameter347ce432006-06-30 01:55:35 -0700106 mem_data->cached = P2K(global_page_state(NR_FILE_PAGES)
107 - val.bufferram);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109 si_swapinfo(&val);
110 mem_data->totalswap = P2K(val.totalswap);
111 mem_data->freeswap = P2K(val.freeswap);
112
113 mem_data->timestamp = get_clock();
114 mem_data->sync_count_2++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115}
116
117
118static struct appldata_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 .name = "mem",
120 .record_nr = APPLDATA_RECORD_MEM_ID,
121 .size = sizeof(struct appldata_mem_data),
122 .callback = &appldata_get_mem_data,
123 .data = &appldata_mem_data,
124 .owner = THIS_MODULE,
Gerald Schaefer5b5dd212006-06-29 15:08:35 +0200125 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126};
127
128
129/*
130 * appldata_mem_init()
131 *
132 * init_data, register ops
133 */
134static int __init appldata_mem_init(void)
135{
Gerald Schaeferd3ae9422008-07-14 09:59:34 +0200136 return appldata_register_ops(&ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
139/*
140 * appldata_mem_exit()
141 *
142 * unregister ops
143 */
144static void __exit appldata_mem_exit(void)
145{
146 appldata_unregister_ops(&ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
149
150module_init(appldata_mem_init);
151module_exit(appldata_mem_exit);
152
153MODULE_LICENSE("GPL");
154MODULE_AUTHOR("Gerald Schaefer");
155MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");