LXR linux/arch/s390/appldata/appldata

   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 */
  36struct 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 */
  75static 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_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
 117static 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 */
 132static 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 */
 152static void __exit appldata_mem_exit(void)
 153{
 154        appldata_unregister_ops(&ops);
 155        kfree(ops.data);
 156}
 157
 158
 159module_init(appldata_mem_init);
 160module_exit(appldata_mem_exit);
 161
 162MODULE_LICENSE("GPL");
 163MODULE_AUTHOR("Gerald Schaefer");
 164MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
 165