LXR linux/arch/s390/appldata/appldata

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
   4 * Collects data related to memory management.
   5 *
   6 * Copyright IBM Corp. 2003, 2006
   7 *
   8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/init.h>
  13#include <linux/errno.h>
  14#include <linux/kernel_stat.h>
  15#include <linux/pagemap.h>
  16#include <linux/swap.h>
  17#include <linux/slab.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 */
  33struct appldata_mem_data {
  34        u64 timestamp;
  35        u32 sync_count_1;       /* after VM collected the record data, */
  36        u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  37                                   same. If not, the record has been updated on
  38                                   the Linux side while VM was collecting the
  39                                   (possibly corrupt) data */
  40
  41        u64 pgpgin;             /* data read from disk  */
  42        u64 pgpgout;            /* data written to disk */
  43        u64 pswpin;             /* pages swapped in  */
  44        u64 pswpout;            /* pages swapped out */
  45
  46        u64 sharedram;          /* sharedram is currently set to 0 */
  47
  48        u64 totalram;           /* total main memory size */
  49        u64 freeram;            /* free main memory size  */
  50        u64 totalhigh;          /* total high memory size */
  51        u64 freehigh;           /* free high memory size  */
  52
  53        u64 bufferram;          /* memory reserved for buffers, free cache */
  54        u64 cached;             /* size of (used) cache, w/o buffers */
  55        u64 totalswap;          /* total swap space size */
  56        u64 freeswap;           /* free swap space */
  57
  58// New in 2.6 -->
  59        u64 pgalloc;            /* page allocations */
  60        u64 pgfault;            /* page faults (major+minor) */
  61        u64 pgmajfault;         /* page faults (major only) */
  62// <-- New in 2.6
  63
  64} __packed;
  65
  66
  67/*
  68 * appldata_get_mem_data()
  69 *
  70 * gather memory data
  71 */
  72static void appldata_get_mem_data(void *data)
  73{
  74        /*
  75         * don't put large structures on the stack, we are
  76         * serialized through the appldata_ops_mutex and can use static
  77         */
  78        static struct sysinfo val;
  79        unsigned long ev[NR_VM_EVENT_ITEMS];
  80        struct appldata_mem_data *mem_data;
  81
  82        mem_data = data;
  83        mem_data->sync_count_1++;
  84
  85        all_vm_events(ev);
  86        mem_data->pgpgin     = ev[PGPGIN] >> 1;
  87        mem_data->pgpgout    = ev[PGPGOUT] >> 1;
  88        mem_data->pswpin     = ev[PSWPIN];
  89        mem_data->pswpout    = ev[PSWPOUT];
  90        mem_data->pgalloc    = ev[PGALLOC_NORMAL];
  91        mem_data->pgalloc    += ev[PGALLOC_DMA];
  92        mem_data->pgfault    = ev[PGFAULT];
  93        mem_data->pgmajfault = ev[PGMAJFAULT];
  94
  95        si_meminfo(&val);
  96        mem_data->sharedram = val.sharedram;
  97        mem_data->totalram  = P2K(val.totalram);
  98        mem_data->freeram   = P2K(val.freeram);
  99        mem_data->totalhigh = P2K(val.totalhigh);
 100        mem_data->freehigh  = P2K(val.freehigh);
 101        mem_data->bufferram = P2K(val.bufferram);
 102        mem_data->cached    = P2K(global_node_page_state(NR_FILE_PAGES)
 103                                - val.bufferram);
 104
 105        si_swapinfo(&val);
 106        mem_data->totalswap = P2K(val.totalswap);
 107        mem_data->freeswap  = P2K(val.freeswap);
 108
 109        mem_data->timestamp = get_tod_clock();
 110        mem_data->sync_count_2++;
 111}
 112
 113
 114static struct appldata_ops ops = {
 115        .name      = "mem",
 116        .record_nr = APPLDATA_RECORD_MEM_ID,
 117        .size      = sizeof(struct appldata_mem_data),
 118        .callback  = &appldata_get_mem_data,
 119        .owner     = THIS_MODULE,
 120        .mod_lvl   = {0xF0, 0xF0},              /* EBCDIC "00" */
 121};
 122
 123
 124/*
 125 * appldata_mem_init()
 126 *
 127 * init_data, register ops
 128 */
 129static int __init appldata_mem_init(void)
 130{
 131        int ret;
 132
 133        ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
 134        if (!ops.data)
 135                return -ENOMEM;
 136
 137        ret = appldata_register_ops(&ops);
 138        if (ret)
 139                kfree(ops.data);
 140
 141        return ret;
 142}
 143
 144/*
 145 * appldata_mem_exit()
 146 *
 147 * unregister ops
 148 */
 149static void __exit appldata_mem_exit(void)
 150{
 151        appldata_unregister_ops(&ops);
 152        kfree(ops.data);
 153}
 154
 155
 156module_init(appldata_mem_init);
 157module_exit(appldata_mem_exit);
 158
 159MODULE_LICENSE("GPL");
 160MODULE_AUTHOR("Gerald Schaefer");
 161MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
 162