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>
18 #include <linux/pagemap.h>
19 #include <linux/swap.h>
24 #define MY_PRINT_NAME "appldata_mem" /* for debug messages, etc. */
25 #define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
30 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
31 * the structure version (product ID, see appldata_base.c) needs to be changed
32 * as well and all documentation and z/VM applications using it must be
35 * The record layout is documented in the Linux for zSeries Device Drivers
37 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
39 struct appldata_mem_data
{
41 u32 sync_count_1
; /* after VM collected the record data, */
42 u32 sync_count_2
; /* sync_count_1 and sync_count_2 should be the
43 same. If not, the record has been updated on
44 the Linux side while VM was collecting the
45 (possibly corrupt) data */
47 u64 pgpgin
; /* data read from disk */
48 u64 pgpgout
; /* data written to disk */
49 u64 pswpin
; /* pages swapped in */
50 u64 pswpout
; /* pages swapped out */
52 u64 sharedram
; /* sharedram is currently set to 0 */
54 u64 totalram
; /* total main memory size */
55 u64 freeram
; /* free main memory size */
56 u64 totalhigh
; /* total high memory size */
57 u64 freehigh
; /* free high memory size */
59 u64 bufferram
; /* memory reserved for buffers, free cache */
60 u64 cached
; /* size of (used) cache, w/o buffers */
61 u64 totalswap
; /* total swap space size */
62 u64 freeswap
; /* free swap space */
65 u64 pgalloc
; /* page allocations */
66 u64 pgfault
; /* page faults (major+minor) */
67 u64 pgmajfault
; /* page faults (major only) */
70 } __attribute__((packed
)) appldata_mem_data
;
73 static inline void appldata_debug_print(struct appldata_mem_data
*mem_data
)
75 P_DEBUG("--- MEM - RECORD ---\n");
76 P_DEBUG("pgpgin = %8lu KB\n", mem_data
->pgpgin
);
77 P_DEBUG("pgpgout = %8lu KB\n", mem_data
->pgpgout
);
78 P_DEBUG("pswpin = %8lu Pages\n", mem_data
->pswpin
);
79 P_DEBUG("pswpout = %8lu Pages\n", mem_data
->pswpout
);
80 P_DEBUG("pgalloc = %8lu \n", mem_data
->pgalloc
);
81 P_DEBUG("pgfault = %8lu \n", mem_data
->pgfault
);
82 P_DEBUG("pgmajfault = %8lu \n", mem_data
->pgmajfault
);
83 P_DEBUG("sharedram = %8lu KB\n", mem_data
->sharedram
);
84 P_DEBUG("totalram = %8lu KB\n", mem_data
->totalram
);
85 P_DEBUG("freeram = %8lu KB\n", mem_data
->freeram
);
86 P_DEBUG("totalhigh = %8lu KB\n", mem_data
->totalhigh
);
87 P_DEBUG("freehigh = %8lu KB\n", mem_data
->freehigh
);
88 P_DEBUG("bufferram = %8lu KB\n", mem_data
->bufferram
);
89 P_DEBUG("cached = %8lu KB\n", mem_data
->cached
);
90 P_DEBUG("totalswap = %8lu KB\n", mem_data
->totalswap
);
91 P_DEBUG("freeswap = %8lu KB\n", mem_data
->freeswap
);
92 P_DEBUG("sync_count_1 = %u\n", mem_data
->sync_count_1
);
93 P_DEBUG("sync_count_2 = %u\n", mem_data
->sync_count_2
);
94 P_DEBUG("timestamp = %lX\n", mem_data
->timestamp
);
98 * appldata_get_mem_data()
102 static void appldata_get_mem_data(void *data
)
105 * don't put large structures on the stack, we are
106 * serialized through the appldata_ops_lock and can use static
108 static struct sysinfo val
;
109 unsigned long ev
[NR_VM_EVENT_ITEMS
];
110 struct appldata_mem_data
*mem_data
;
113 mem_data
->sync_count_1
++;
116 mem_data
->pgpgin
= ev
[PGPGIN
] >> 1;
117 mem_data
->pgpgout
= ev
[PGPGOUT
] >> 1;
118 mem_data
->pswpin
= ev
[PSWPIN
];
119 mem_data
->pswpout
= ev
[PSWPOUT
];
120 mem_data
->pgalloc
= ev
[PGALLOC_NORMAL
] + ev
[PGALLOC_DMA
];
121 mem_data
->pgfault
= ev
[PGFAULT
];
122 mem_data
->pgmajfault
= ev
[PGMAJFAULT
];
125 mem_data
->sharedram
= val
.sharedram
;
126 mem_data
->totalram
= P2K(val
.totalram
);
127 mem_data
->freeram
= P2K(val
.freeram
);
128 mem_data
->totalhigh
= P2K(val
.totalhigh
);
129 mem_data
->freehigh
= P2K(val
.freehigh
);
130 mem_data
->bufferram
= P2K(val
.bufferram
);
131 mem_data
->cached
= P2K(global_page_state(NR_FILE_PAGES
)
135 mem_data
->totalswap
= P2K(val
.totalswap
);
136 mem_data
->freeswap
= P2K(val
.freeswap
);
138 mem_data
->timestamp
= get_clock();
139 mem_data
->sync_count_2
++;
140 #ifdef APPLDATA_DEBUG
141 appldata_debug_print(mem_data
);
146 static struct appldata_ops ops
= {
147 .ctl_nr
= CTL_APPLDATA_MEM
,
149 .record_nr
= APPLDATA_RECORD_MEM_ID
,
150 .size
= sizeof(struct appldata_mem_data
),
151 .callback
= &appldata_get_mem_data
,
152 .data
= &appldata_mem_data
,
153 .owner
= THIS_MODULE
,
154 .mod_lvl
= {0xF0, 0xF0}, /* EBCDIC "00" */
159 * appldata_mem_init()
161 * init_data, register ops
163 static int __init
appldata_mem_init(void)
167 P_DEBUG("sizeof(mem) = %lu\n", sizeof(struct appldata_mem_data
));
169 rc
= appldata_register_ops(&ops
);
171 P_ERROR("Error registering ops, rc = %i\n", rc
);
173 P_DEBUG("%s-ops registered!\n", ops
.name
);
179 * appldata_mem_exit()
183 static void __exit
appldata_mem_exit(void)
185 appldata_unregister_ops(&ops
);
186 P_DEBUG("%s-ops unregistered!\n", ops
.name
);
190 module_init(appldata_mem_init
);
191 module_exit(appldata_mem_exit
);
193 MODULE_LICENSE("GPL");
194 MODULE_AUTHOR("Gerald Schaefer");
195 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");