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 <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 */
  35struct 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 */
  74static 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
 116static 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 */
 131static 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 */
 151static void __exit appldata_mem_exit(void)
 152{
 153        appldata_unregister_ops(&ops);
 154        kfree(ops.data);
 155}
 156
 157
 158module_init(appldata_mem_init);
 159module_exit(appldata_mem_exit);
 160
 161MODULE_LICENSE("GPL");
 162MODULE_AUTHOR("Gerald Schaefer");
 163MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
 164