1 /* 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 * 7 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH. 8 * 9 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> 10 */ 11 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> 18 #include <asm/io.h> 19 #include <linux/pagemap.h> 20 #include <linux/swap.h> 21 22 #include "appldata.h" 23 24 25 #define MY_PRINT_NAME "appldata_mem" /* for debug messages, etc. */ 26 #define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */ 27 28 /* 29 * Memory data 30 * 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 34 * updated. 35 * 36 * The record layout is documented in the Linux for zSeries Device Drivers 37 * book: 38 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml 39 */ 40 struct appldata_mem_data { 41 u64 timestamp; 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 */ 47 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 */ 52 53 u64 sharedram; /* sharedram is currently set to 0 */ 54 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 */ 59 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 */ 64 65 // New in 2.6 --> 66 u64 pgalloc; /* page allocations */ 67 u64 pgfault; /* page faults (major+minor) */ 68 u64 pgmajfault; /* page faults (major only) */ 69 // <-- New in 2.6 70 71 } __attribute__((packed)) appldata_mem_data; 72 73 74 static inline void appldata_debug_print(struct appldata_mem_data *mem_data) 75 { 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); 96 } 97 98 /* 99 * appldata_get_mem_data() 100 * 101 * gather memory data 102 */ 103 static void appldata_get_mem_data(void *data) 104 { 105 /* 106 * don't put large structures on the stack, we are 107 * serialized through the appldata_ops_lock and can use static 108 */ 109 static struct sysinfo val; 110 unsigned long ev[NR_VM_EVENT_ITEMS]; 111 struct appldata_mem_data *mem_data; 112 113 mem_data = data; 114 mem_data->sync_count_1++; 115 116 all_vm_events(ev); 117 mem_data->pgpgin = ev[PGPGIN] >> 1; 118 mem_data->pgpgout = ev[PGPGOUT] >> 1; 119 mem_data->pswpin = ev[PSWPIN]; 120 mem_data->pswpout = ev[PSWPOUT]; 121 mem_data->pgalloc = ev[PGALLOC_HIGH] + ev[PGALLOC_NORMAL] + 122 ev[PGALLOC_DMA]; 123 mem_data->pgfault = ev[PGFAULT]; 124 mem_data->pgmajfault = ev[PGMAJFAULT]; 125 126 si_meminfo(&val); 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(global_page_state(NR_FILE_PAGES) 134 - val.bufferram); 135 136 si_swapinfo(&val); 137 mem_data->totalswap = P2K(val.totalswap); 138 mem_data->freeswap = P2K(val.freeswap); 139 140 mem_data->timestamp = get_clock(); 141 mem_data->sync_count_2++; 142 #ifdef APPLDATA_DEBUG 143 appldata_debug_print(mem_data); 144 #endif 145 } 146 147 148 static struct appldata_ops ops = { 149 .ctl_nr = CTL_APPLDATA_MEM, 150 .name = "mem", 151 .record_nr = APPLDATA_RECORD_MEM_ID, 152 .size = sizeof(struct appldata_mem_data), 153 .callback = &appldata_get_mem_data, 154 .data = &appldata_mem_data, 155 .owner = THIS_MODULE, 156 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */ 157 }; 158 159 160 /* 161 * appldata_mem_init() 162 * 163 * init_data, register ops 164 */ 165 static int __init appldata_mem_init(void) 166 { 167 int rc; 168 169 P_DEBUG("sizeof(mem) = %lu\n", sizeof(struct appldata_mem_data)); 170 171 rc = appldata_register_ops(&ops); 172 if (rc != 0) { 173 P_ERROR("Error registering ops, rc = %i\n", rc); 174 } else { 175 P_DEBUG("%s-ops registered!\n", ops.name); 176 } 177 return rc; 178 } 179 180 /* 181 * appldata_mem_exit() 182 * 183 * unregister ops 184 */ 185 static void __exit appldata_mem_exit(void) 186 { 187 appldata_unregister_ops(&ops); 188 P_DEBUG("%s-ops unregistered!\n", ops.name); 189 } 190 191 192 module_init(appldata_mem_init); 193 module_exit(appldata_mem_exit); 194 195 MODULE_LICENSE("GPL"); 196 MODULE_AUTHOR("Gerald Schaefer"); 197 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics"); 198