LXR linux/arch/s390/appldata/appldata

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