arch/s390/appldata/appldata_mem.c

   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 IBM Corporation, IBM Deutschland Entwicklung GmbH.
   8  *
   9  * Author: Gerald Schaefer <geraldsc@de.ibm.com>
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/errno.h>
  17 #include <linux/kernel_stat.h>
  18 #include <asm/io.h>
  19 #include <linux/pagemap.h>
  20 #include <linux/swap.h>
  21
  22 #include "appldata.h"
  23
  24
  25 #define MY_PRINT_NAME "appldata_mem"            /* for debug messages, etc. */
  26 #define P2K(x) ((x) << (PAGE_SHIFT - 10))       /* Converts #Pages to KB */
  27
  28 /*
  29  * Memory data
  30  *
  31  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  32  * the structure version (product ID, see appldata_base.c) needs to be changed
  33  * as well and all documentation and z/VM applications using it must be
  34  * updated.
  35  *
  36  * The record layout is documented in the Linux for zSeries Device Drivers
  37  * book:
  38  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  39  */
  40 struct appldata_mem_data {
  41         u64 timestamp;
  42         u32 sync_count_1;       /* after VM collected the record data, */
  43         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  44                                    same. If not, the record has been updated on
  45                                    the Linux side while VM was collecting the
  46                                    (possibly corrupt) data */
  47
  48         u64 pgpgin;             /* data read from disk  */
  49         u64 pgpgout;            /* data written to disk */
  50         u64 pswpin;             /* pages swapped in  */
  51         u64 pswpout;            /* pages swapped out */
  52
  53         u64 sharedram;          /* sharedram is currently set to 0 */
  54
  55         u64 totalram;           /* total main memory size */
  56         u64 freeram;            /* free main memory size  */
  57         u64 totalhigh;          /* total high memory size */
  58         u64 freehigh;           /* free high memory size  */
  59
  60         u64 bufferram;          /* memory reserved for buffers, free cache */
  61         u64 cached;             /* size of (used) cache, w/o buffers */
  62         u64 totalswap;          /* total swap space size */
  63         u64 freeswap;           /* free swap space */
  64
  65 // New in 2.6 -->
  66         u64 pgalloc;            /* page allocations */
  67         u64 pgfault;            /* page faults (major+minor) */
  68         u64 pgmajfault;         /* page faults (major only) */
  69 // <-- New in 2.6
  70
  71 } appldata_mem_data;
  72
  73
  74 static inline void appldata_debug_print(struct appldata_mem_data *mem_data)
  75 {
  76         P_DEBUG("--- MEM - RECORD ---\n");
  77         P_DEBUG("pgpgin     = %8lu KB\n", mem_data->pgpgin);
  78         P_DEBUG("pgpgout    = %8lu KB\n", mem_data->pgpgout);
  79         P_DEBUG("pswpin     = %8lu Pages\n", mem_data->pswpin);
  80         P_DEBUG("pswpout    = %8lu Pages\n", mem_data->pswpout);
  81         P_DEBUG("pgalloc    = %8lu \n", mem_data->pgalloc);
  82         P_DEBUG("pgfault    = %8lu \n", mem_data->pgfault);
  83         P_DEBUG("pgmajfault = %8lu \n", mem_data->pgmajfault);
  84         P_DEBUG("sharedram  = %8lu KB\n", mem_data->sharedram);
  85         P_DEBUG("totalram   = %8lu KB\n", mem_data->totalram);
  86         P_DEBUG("freeram    = %8lu KB\n", mem_data->freeram);
  87         P_DEBUG("totalhigh  = %8lu KB\n", mem_data->totalhigh);
  88         P_DEBUG("freehigh   = %8lu KB\n", mem_data->freehigh);
  89         P_DEBUG("bufferram  = %8lu KB\n", mem_data->bufferram);
  90         P_DEBUG("cached     = %8lu KB\n", mem_data->cached);
  91         P_DEBUG("totalswap  = %8lu KB\n", mem_data->totalswap);
  92         P_DEBUG("freeswap   = %8lu KB\n", mem_data->freeswap);
  93         P_DEBUG("sync_count_1 = %u\n", mem_data->sync_count_1);
  94         P_DEBUG("sync_count_2 = %u\n", mem_data->sync_count_2);
  95         P_DEBUG("timestamp    = %lX\n", mem_data->timestamp);
  96 }
  97
  98 /*
  99  * appldata_get_mem_data()
 100  *
 101  * gather memory data
 102  */
 103 static void appldata_get_mem_data(void *data)
 104 {
 105         /*
 106          * don't put large structures on the stack, we are
 107          * serialized through the appldata_ops_lock and can use static
 108          */
 109         static struct sysinfo val;
 110         static struct page_state ps;
 111         struct appldata_mem_data *mem_data;
 112
 113         mem_data = data;
 114         mem_data->sync_count_1++;
 115
 116         get_full_page_state(&ps);
 117         mem_data->pgpgin     = ps.pgpgin >> 1;
 118         mem_data->pgpgout    = ps.pgpgout >> 1;
 119         mem_data->pswpin     = ps.pswpin;
 120         mem_data->pswpout    = ps.pswpout;
 121         mem_data->pgalloc    = ps.pgalloc_high + ps.pgalloc_normal +
 122                                ps.pgalloc_dma;
 123         mem_data->pgfault    = ps.pgfault;
 124         mem_data->pgmajfault = ps.pgmajfault;
 125
 126         si_meminfo(&val);
 127         mem_data->sharedram = val.sharedram;
 128         mem_data->totalram  = P2K(val.totalram);
 129         mem_data->freeram   = P2K(val.freeram);
 130         mem_data->totalhigh = P2K(val.totalhigh);
 131         mem_data->freehigh  = P2K(val.freehigh);
 132         mem_data->bufferram = P2K(val.bufferram);
 133         mem_data->cached    = P2K(atomic_read(&nr_pagecache) - val.bufferram);
 134
 135         si_swapinfo(&val);
 136         mem_data->totalswap = P2K(val.totalswap);
 137         mem_data->freeswap  = P2K(val.freeswap);
 138
 139         mem_data->timestamp = get_clock();
 140         mem_data->sync_count_2++;
 141 #ifdef APPLDATA_DEBUG
 142         appldata_debug_print(mem_data);
 143 #endif
 144 }
 145
 146
 147 static struct appldata_ops ops = {
 148         .ctl_nr    = CTL_APPLDATA_MEM,
 149         .name      = "mem",
 150         .record_nr = APPLDATA_RECORD_MEM_ID,
 151         .size      = sizeof(struct appldata_mem_data),
 152         .callback  = &appldata_get_mem_data,
 153         .data      = &appldata_mem_data,
 154         .owner     = THIS_MODULE,
 155 };
 156
 157
 158 /*
 159  * appldata_mem_init()
 160  *
 161  * init_data, register ops
 162  */
 163 static int __init appldata_mem_init(void)
 164 {
 165         int rc;
 166
 167         P_DEBUG("sizeof(mem) = %lu\n", sizeof(struct appldata_mem_data));
 168
 169         rc = appldata_register_ops(&ops);
 170         if (rc != 0) {
 171                 P_ERROR("Error registering ops, rc = %i\n", rc);
 172         } else {
 173                 P_DEBUG("%s-ops registered!\n", ops.name);
 174         }
 175         return rc;
 176 }
 177
 178 /*
 179  * appldata_mem_exit()
 180  *
 181  * unregister ops
 182  */
 183 static void __exit appldata_mem_exit(void)
 184 {
 185         appldata_unregister_ops(&ops);
 186         P_DEBUG("%s-ops unregistered!\n", ops.name);
 187 }
 188
 189
 190 module_init(appldata_mem_init);
 191 module_exit(appldata_mem_exit);
 192
 193 MODULE_LICENSE("GPL");
 194 MODULE_AUTHOR("Gerald Schaefer");
 195 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");