arch/s390/appldata/appldata_mem.c

   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 <asm/io.h>
  17
  18 #include "appldata.h"
  19
  20
  21 #define P2K(x) ((x) << (PAGE_SHIFT - 10))       /* Converts #Pages to KB */
  22
  23 /*
  24  * Memory data
  25  *
  26  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  27  * the structure version (product ID, see appldata_base.c) needs to be changed
  28  * as well and all documentation and z/VM applications using it must be
  29  * updated.
  30  *
  31  * The record layout is documented in the Linux for zSeries Device Drivers
  32  * book:
  33  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  34  */
  35 struct appldata_mem_data {
  36         u64 timestamp;
  37         u32 sync_count_1;       /* after VM collected the record data, */
  38         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  39                                    same. If not, the record has been updated on
  40                                    the Linux side while VM was collecting the
  41                                    (possibly corrupt) data */
  42
  43         u64 pgpgin;             /* data read from disk  */
  44         u64 pgpgout;            /* data written to disk */
  45         u64 pswpin;             /* pages swapped in  */
  46         u64 pswpout;            /* pages swapped out */
  47
  48         u64 sharedram;          /* sharedram is currently set to 0 */
  49
  50         u64 totalram;           /* total main memory size */
  51         u64 freeram;            /* free main memory size  */
  52         u64 totalhigh;          /* total high memory size */
  53         u64 freehigh;           /* free high memory size  */
  54
  55         u64 bufferram;          /* memory reserved for buffers, free cache */
  56         u64 cached;             /* size of (used) cache, w/o buffers */
  57         u64 totalswap;          /* total swap space size */
  58         u64 freeswap;           /* free swap space */
  59
  60 // New in 2.6 -->
  61         u64 pgalloc;            /* page allocations */
  62         u64 pgfault;            /* page faults (major+minor) */
  63         u64 pgmajfault;         /* page faults (major only) */
  64 // <-- New in 2.6
  65
  66 } __packed;
  67
  68
  69 /*
  70  * appldata_get_mem_data()
  71  *
  72  * gather memory data
  73  */
  74 static void appldata_get_mem_data(void *data)
  75 {
  76         /*
  77          * don't put large structures on the stack, we are
  78          * serialized through the appldata_ops_mutex and can use static
  79          */
  80         static struct sysinfo val;
  81         unsigned long ev[NR_VM_EVENT_ITEMS];
  82         struct appldata_mem_data *mem_data;
  83
  84         mem_data = data;
  85         mem_data->sync_count_1++;
  86
  87         all_vm_events(ev);
  88         mem_data->pgpgin     = ev[PGPGIN] >> 1;
  89         mem_data->pgpgout    = ev[PGPGOUT] >> 1;
  90         mem_data->pswpin     = ev[PSWPIN];
  91         mem_data->pswpout    = ev[PSWPOUT];
  92         mem_data->pgalloc    = ev[PGALLOC_NORMAL];
  93         mem_data->pgalloc    += ev[PGALLOC_DMA];
  94         mem_data->pgfault    = ev[PGFAULT];
  95         mem_data->pgmajfault = ev[PGMAJFAULT];
  96
  97         si_meminfo(&val);
  98         mem_data->sharedram = val.sharedram;
  99         mem_data->totalram  = P2K(val.totalram);
 100         mem_data->freeram   = P2K(val.freeram);
 101         mem_data->totalhigh = P2K(val.totalhigh);
 102         mem_data->freehigh  = P2K(val.freehigh);
 103         mem_data->bufferram = P2K(val.bufferram);
 104         mem_data->cached    = P2K(global_page_state(NR_FILE_PAGES)
 105                                 - val.bufferram);
 106
 107         si_swapinfo(&val);
 108         mem_data->totalswap = P2K(val.totalswap);
 109         mem_data->freeswap  = P2K(val.freeswap);
 110
 111         mem_data->timestamp = get_tod_clock();
 112         mem_data->sync_count_2++;
 113 }
 114
 115
 116 static struct appldata_ops ops = {
 117         .name      = "mem",
 118         .record_nr = APPLDATA_RECORD_MEM_ID,
 119         .size      = sizeof(struct appldata_mem_data),
 120         .callback  = &appldata_get_mem_data,
 121         .owner     = THIS_MODULE,
 122         .mod_lvl   = {0xF0, 0xF0},              /* EBCDIC "00" */
 123 };
 124
 125
 126 /*
 127  * appldata_mem_init()
 128  *
 129  * init_data, register ops
 130  */
 131 static int __init appldata_mem_init(void)
 132 {
 133         int ret;
 134
 135         ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
 136         if (!ops.data)
 137                 return -ENOMEM;
 138
 139         ret = appldata_register_ops(&ops);
 140         if (ret)
 141                 kfree(ops.data);
 142
 143         return ret;
 144 }
 145
 146 /*
 147  * appldata_mem_exit()
 148  *
 149  * unregister ops
 150  */
 151 static void __exit appldata_mem_exit(void)
 152 {
 153         appldata_unregister_ops(&ops);
 154         kfree(ops.data);
 155 }
 156
 157
 158 module_init(appldata_mem_init);
 159 module_exit(appldata_mem_exit);
 160
 161 MODULE_LICENSE("GPL");
 162 MODULE_AUTHOR("Gerald Schaefer");
 163 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");