1 /* 2 * Data gathering module for Linux-VM Monitor Stream, Stage 1. 3 * Collects data related to memory management. 4 * 5 * Copyright IBM Corp. 2003, 2006 6 * 7 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/errno.h> 13 #include <linux/kernel_stat.h> 14 #include <linux/pagemap.h> 15 #include <linux/swap.h> 16 #include <linux/slab.h> 17 #include <asm/io.h> 18 19 #include "appldata.h" 20 21 22 #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 */ 36 struct appldata_mem_data { 37 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 67 } __packed; 68 69 70 /* 71 * appldata_get_mem_data() 72 * 73 * gather memory data 74 */ 75 static void appldata_get_mem_data(void *data) 76 { 77 /* 78 * don't put large structures on the stack, we are 79 * serialized through the appldata_ops_mutex and can use static 80 */ 81 static struct sysinfo val; 82 unsigned long ev[NR_VM_EVENT_ITEMS]; 83 struct appldata_mem_data *mem_data; 84 85 mem_data = data; 86 mem_data->sync_count_1++; 87 88 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]; 93 mem_data->pgalloc = ev[PGALLOC_NORMAL]; 94 mem_data->pgalloc += ev[PGALLOC_DMA]; 95 mem_data->pgfault = ev[PGFAULT]; 96 mem_data->pgmajfault = ev[PGMAJFAULT]; 97 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); 105 mem_data->cached = P2K(global_node_page_state(NR_FILE_PAGES) 106 - val.bufferram); 107 108 si_swapinfo(&val); 109 mem_data->totalswap = P2K(val.totalswap); 110 mem_data->freeswap = P2K(val.freeswap); 111 112 mem_data->timestamp = get_tod_clock(); 113 mem_data->sync_count_2++; 114 } 115 116 117 static struct appldata_ops ops = { 118 .name = "mem", 119 .record_nr = APPLDATA_RECORD_MEM_ID, 120 .size = sizeof(struct appldata_mem_data), 121 .callback = &appldata_get_mem_data, 122 .owner = THIS_MODULE, 123 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */ 124 }; 125 126 127 /* 128 * appldata_mem_init() 129 * 130 * init_data, register ops 131 */ 132 static int __init appldata_mem_init(void) 133 { 134 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; 145 } 146 147 /* 148 * appldata_mem_exit() 149 * 150 * unregister ops 151 */ 152 static void __exit appldata_mem_exit(void) 153 { 154 appldata_unregister_ops(&ops); 155 kfree(ops.data); 156 } 157 158 159 module_init(appldata_mem_init); 160 module_exit(appldata_mem_exit); 161 162 MODULE_LICENSE("GPL"); 163 MODULE_AUTHOR("Gerald Schaefer"); 164 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics"); 165