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) 2003,2006 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/slab.h>
  15 #include <linux/errno.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/pagemap.h>
  18 #include <linux/swap.h>
  19 #include <asm/io.h>
  20
  21 #include "appldata.h"
  22
  23
  24 #define P2K(x) ((x) << (PAGE_SHIFT - 10))       /* Converts #Pages to KB */
  25
  26 /*
  27  * Memory data
  28  *
  29  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  30  * the structure version (product ID, see appldata_base.c) needs to be changed
  31  * as well and all documentation and z/VM applications using it must be
  32  * updated.
  33  *
  34  * The record layout is documented in the Linux for zSeries Device Drivers
  35  * book:
  36  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  37  */
  38 static struct appldata_mem_data {
  39         u64 timestamp;
  40         u32 sync_count_1;       /* after VM collected the record data, */
  41         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  42                                    same. If not, the record has been updated on
  43                                    the Linux side while VM was collecting the
  44                                    (possibly corrupt) data */
  45
  46         u64 pgpgin;             /* data read from disk  */
  47         u64 pgpgout;            /* data written to disk */
  48         u64 pswpin;             /* pages swapped in  */
  49         u64 pswpout;            /* pages swapped out */
  50
  51         u64 sharedram;          /* sharedram is currently set to 0 */
  52
  53         u64 totalram;           /* total main memory size */
  54         u64 freeram;            /* free main memory size  */
  55         u64 totalhigh;          /* total high memory size */
  56         u64 freehigh;           /* free high memory size  */
  57
  58         u64 bufferram;          /* memory reserved for buffers, free cache */
  59         u64 cached;             /* size of (used) cache, w/o buffers */
  60         u64 totalswap;          /* total swap space size */
  61         u64 freeswap;           /* free swap space */
  62
  63 // New in 2.6 -->
  64         u64 pgalloc;            /* page allocations */
  65         u64 pgfault;            /* page faults (major+minor) */
  66         u64 pgmajfault;         /* page faults (major only) */
  67 // <-- New in 2.6
  68
  69 } __attribute__((packed)) appldata_mem_data;
  70
  71
  72 /*
  73  * appldata_get_mem_data()
  74  *
  75  * gather memory data
  76  */
  77 static void appldata_get_mem_data(void *data)
  78 {
  79         /*
  80          * don't put large structures on the stack, we are
  81          * serialized through the appldata_ops_mutex and can use static
  82          */
  83         static struct sysinfo val;
  84         unsigned long ev[NR_VM_EVENT_ITEMS];
  85         struct appldata_mem_data *mem_data;
  86
  87         mem_data = data;
  88         mem_data->sync_count_1++;
  89
  90         all_vm_events(ev);
  91         mem_data->pgpgin     = ev[PGPGIN] >> 1;
  92         mem_data->pgpgout    = ev[PGPGOUT] >> 1;
  93         mem_data->pswpin     = ev[PSWPIN];
  94         mem_data->pswpout    = ev[PSWPOUT];
  95         mem_data->pgalloc    = ev[PGALLOC_NORMAL];
  96 #ifdef CONFIG_ZONE_DMA
  97         mem_data->pgalloc    += ev[PGALLOC_DMA];
  98 #endif
  99         mem_data->pgfault    = ev[PGFAULT];
 100         mem_data->pgmajfault = ev[PGMAJFAULT];
 101
 102         si_meminfo(&val);
 103         mem_data->sharedram = val.sharedram;
 104         mem_data->totalram  = P2K(val.totalram);
 105         mem_data->freeram   = P2K(val.freeram);
 106         mem_data->totalhigh = P2K(val.totalhigh);
 107         mem_data->freehigh  = P2K(val.freehigh);
 108         mem_data->bufferram = P2K(val.bufferram);
 109         mem_data->cached    = P2K(global_page_state(NR_FILE_PAGES)
 110                                 - val.bufferram);
 111
 112         si_swapinfo(&val);
 113         mem_data->totalswap = P2K(val.totalswap);
 114         mem_data->freeswap  = P2K(val.freeswap);
 115
 116         mem_data->timestamp = get_clock();
 117         mem_data->sync_count_2++;
 118 }
 119
 120
 121 static struct appldata_ops ops = {
 122         .name      = "mem",
 123         .record_nr = APPLDATA_RECORD_MEM_ID,
 124         .size      = sizeof(struct appldata_mem_data),
 125         .callback  = &appldata_get_mem_data,
 126         .data      = &appldata_mem_data,
 127         .owner     = THIS_MODULE,
 128         .mod_lvl   = {0xF0, 0xF0},              /* EBCDIC "00" */
 129 };
 130
 131
 132 /*
 133  * appldata_mem_init()
 134  *
 135  * init_data, register ops
 136  */
 137 static int __init appldata_mem_init(void)
 138 {
 139         return appldata_register_ops(&ops);
 140 }
 141
 142 /*
 143  * appldata_mem_exit()
 144  *
 145  * unregister ops
 146  */
 147 static void __exit appldata_mem_exit(void)
 148 {
 149         appldata_unregister_ops(&ops);
 150 }
 151
 152
 153 module_init(appldata_mem_init);
 154 module_exit(appldata_mem_exit);
 155
 156 MODULE_LICENSE("GPL");
 157 MODULE_AUTHOR("Gerald Schaefer");
 158 MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");