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 IBM Corporation, IBM Deutschland Entwicklung GmbH.
9 * Author: Gerald Schaefer <geraldsc@de.ibm.com>
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/errno.h>
17 #include <linux/kernel_stat.h>
19 #include <linux/pagemap.h>
20 #include <linux/swap.h>
25 #define MY_PRINT_NAME "appldata_mem" /* for debug messages, etc. */
26 #define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
31 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
32 * the structure version (product ID, see appldata_base.c) needs to be changed
33 * as well and all documentation and z/VM applications using it must be
36 * The record layout is documented in the Linux for zSeries Device Drivers
38 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
40 struct appldata_mem_data {
42 u32 sync_count_1; /* after VM collected the record data, */
43 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
44 same. If not, the record has been updated on
45 the Linux side while VM was collecting the
46 (possibly corrupt) data */
48 u64 pgpgin; /* data read from disk */
49 u64 pgpgout; /* data written to disk */
50 u64 pswpin; /* pages swapped in */
51 u64 pswpout; /* pages swapped out */
53 u64 sharedram; /* sharedram is currently set to 0 */
55 u64 totalram; /* total main memory size */
56 u64 freeram; /* free main memory size */
57 u64 totalhigh; /* total high memory size */
58 u64 freehigh; /* free high memory size */
60 u64 bufferram; /* memory reserved for buffers, free cache */
61 u64 cached; /* size of (used) cache, w/o buffers */
62 u64 totalswap; /* total swap space size */
63 u64 freeswap; /* free swap space */
66 u64 pgalloc; /* page allocations */
67 u64 pgfault; /* page faults (major+minor) */
68 u64 pgmajfault; /* page faults (major only) */
71 } __attribute__((packed)) appldata_mem_data;
74 static inline void appldata_debug_print(struct appldata_mem_data *mem_data)
76 P_DEBUG("--- MEM - RECORD ---\n");
77 P_DEBUG("pgpgin = %8lu KB\n", mem_data->pgpgin);
78 P_DEBUG("pgpgout = %8lu KB\n", mem_data->pgpgout);
79 P_DEBUG("pswpin = %8lu Pages\n", mem_data->pswpin);
80 P_DEBUG("pswpout = %8lu Pages\n", mem_data->pswpout);
81 P_DEBUG("pgalloc = %8lu \n", mem_data->pgalloc);
82 P_DEBUG("pgfault = %8lu \n", mem_data->pgfault);
83 P_DEBUG("pgmajfault = %8lu \n", mem_data->pgmajfault);
84 P_DEBUG("sharedram = %8lu KB\n", mem_data->sharedram);
85 P_DEBUG("totalram = %8lu KB\n", mem_data->totalram);
86 P_DEBUG("freeram = %8lu KB\n", mem_data->freeram);
87 P_DEBUG("totalhigh = %8lu KB\n", mem_data->totalhigh);
88 P_DEBUG("freehigh = %8lu KB\n", mem_data->freehigh);
89 P_DEBUG("bufferram = %8lu KB\n", mem_data->bufferram);
90 P_DEBUG("cached = %8lu KB\n", mem_data->cached);
91 P_DEBUG("totalswap = %8lu KB\n", mem_data->totalswap);
92 P_DEBUG("freeswap = %8lu KB\n", mem_data->freeswap);
93 P_DEBUG("sync_count_1 = %u\n", mem_data->sync_count_1);
94 P_DEBUG("sync_count_2 = %u\n", mem_data->sync_count_2);
95 P_DEBUG("timestamp = %lX\n", mem_data->timestamp);
99 * appldata_get_mem_data()
103 static void appldata_get_mem_data(void *data)
106 * don't put large structures on the stack, we are
107 * serialized through the appldata_ops_lock and can use static
109 static struct sysinfo val;
110 static struct page_state ps;
111 struct appldata_mem_data *mem_data;
114 mem_data->sync_count_1++;
116 get_full_page_state(&ps);
117 mem_data->pgpgin = ps.pgpgin >> 1;
118 mem_data->pgpgout = ps.pgpgout >> 1;
119 mem_data->pswpin = ps.pswpin;
120 mem_data->pswpout = ps.pswpout;
121 mem_data->pgalloc = ps.pgalloc_high + ps.pgalloc_normal +
123 mem_data->pgfault = ps.pgfault;
124 mem_data->pgmajfault = ps.pgmajfault;
127 mem_data->sharedram = val.sharedram;
128 mem_data->totalram = P2K(val.totalram);
129 mem_data->freeram = P2K(val.freeram);
130 mem_data->totalhigh = P2K(val.totalhigh);
131 mem_data->freehigh = P2K(val.freehigh);
132 mem_data->bufferram = P2K(val.bufferram);
133 mem_data->cached = P2K(atomic_read(&nr_pagecache) - val.bufferram);
136 mem_data->totalswap = P2K(val.totalswap);
137 mem_data->freeswap = P2K(val.freeswap);
139 mem_data->timestamp = get_clock();
140 mem_data->sync_count_2++;
141 #ifdef APPLDATA_DEBUG
142 appldata_debug_print(mem_data);
147 static struct appldata_ops ops = {
148 .ctl_nr = CTL_APPLDATA_MEM,
150 .record_nr = APPLDATA_RECORD_MEM_ID,
151 .size = sizeof(struct appldata_mem_data),
152 .callback = &appldata_get_mem_data,
153 .data = &appldata_mem_data,
154 .owner = THIS_MODULE,
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");