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appldata_mem.c

/*
 * arch/s390/appldata/appldata_mem.c
 *
 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
 * Collects data related to memory management.
 *
 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <asm/io.h>
#include <linux/pagemap.h>
#include <linux/swap.h>

#include "appldata.h"


#define MY_PRINT_NAME "appldata_mem"            /* for debug messages, etc. */
#define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */

/*
 * Memory data
 *
 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 * the structure version (product ID, see appldata_base.c) needs to be changed
 * as well and all documentation and z/VM applications using it must be
 * updated.
 *
 * The record layout is documented in the Linux for zSeries Device Drivers
 * book:
 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
 */
static struct appldata_mem_data {
      u64 timestamp;
      u32 sync_count_1;       /* after VM collected the record data, */
      u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
                           same. If not, the record has been updated on
                           the Linux side while VM was collecting the
                           (possibly corrupt) data */

      u64 pgpgin;       /* data read from disk  */
      u64 pgpgout;            /* data written to disk */
      u64 pswpin;       /* pages swapped in  */
      u64 pswpout;            /* pages swapped out */

      u64 sharedram;          /* sharedram is currently set to 0 */

      u64 totalram;           /* total main memory size */
      u64 freeram;            /* free main memory size  */
      u64 totalhigh;          /* total high memory size */
      u64 freehigh;           /* free high memory size  */

      u64 bufferram;          /* memory reserved for buffers, free cache */
      u64 cached;       /* size of (used) cache, w/o buffers */
      u64 totalswap;          /* total swap space size */
      u64 freeswap;           /* free swap space */

// New in 2.6 -->
      u64 pgalloc;            /* page allocations */
      u64 pgfault;            /* page faults (major+minor) */
      u64 pgmajfault;         /* page faults (major only) */
// <-- New in 2.6

} __attribute__((packed)) appldata_mem_data;


static inline void appldata_debug_print(struct appldata_mem_data *mem_data)
{
      P_DEBUG("--- MEM - RECORD ---\n");
      P_DEBUG("pgpgin     = %8lu KB\n", mem_data->pgpgin);
      P_DEBUG("pgpgout    = %8lu KB\n", mem_data->pgpgout);
      P_DEBUG("pswpin     = %8lu Pages\n", mem_data->pswpin);
      P_DEBUG("pswpout    = %8lu Pages\n", mem_data->pswpout);
      P_DEBUG("pgalloc    = %8lu \n", mem_data->pgalloc);
      P_DEBUG("pgfault    = %8lu \n", mem_data->pgfault);
      P_DEBUG("pgmajfault = %8lu \n", mem_data->pgmajfault);
      P_DEBUG("sharedram  = %8lu KB\n", mem_data->sharedram);
      P_DEBUG("totalram   = %8lu KB\n", mem_data->totalram);
      P_DEBUG("freeram    = %8lu KB\n", mem_data->freeram);
      P_DEBUG("totalhigh  = %8lu KB\n", mem_data->totalhigh);
      P_DEBUG("freehigh   = %8lu KB\n", mem_data->freehigh);
      P_DEBUG("bufferram  = %8lu KB\n", mem_data->bufferram);
      P_DEBUG("cached     = %8lu KB\n", mem_data->cached);
      P_DEBUG("totalswap  = %8lu KB\n", mem_data->totalswap);
      P_DEBUG("freeswap   = %8lu KB\n", mem_data->freeswap);
      P_DEBUG("sync_count_1 = %u\n", mem_data->sync_count_1);
      P_DEBUG("sync_count_2 = %u\n", mem_data->sync_count_2);
      P_DEBUG("timestamp    = %lX\n", mem_data->timestamp);
}

/*
 * appldata_get_mem_data()
 *
 * gather memory data
 */
static void appldata_get_mem_data(void *data)
{
      /*
       * don't put large structures on the stack, we are
       * serialized through the appldata_ops_lock and can use static
       */
      static struct sysinfo val;
      unsigned long ev[NR_VM_EVENT_ITEMS];
      struct appldata_mem_data *mem_data;

      mem_data = data;
      mem_data->sync_count_1++;

      all_vm_events(ev);
      mem_data->pgpgin     = ev[PGPGIN] >> 1;
      mem_data->pgpgout    = ev[PGPGOUT] >> 1;
      mem_data->pswpin     = ev[PSWPIN];
      mem_data->pswpout    = ev[PSWPOUT];
      mem_data->pgalloc    = ev[PGALLOC_NORMAL];
#ifdef CONFIG_ZONE_DMA
      mem_data->pgalloc    += ev[PGALLOC_DMA];
#endif
      mem_data->pgfault    = ev[PGFAULT];
      mem_data->pgmajfault = ev[PGMAJFAULT];

      si_meminfo(&val);
      mem_data->sharedram = val.sharedram;
      mem_data->totalram  = P2K(val.totalram);
      mem_data->freeram   = P2K(val.freeram);
      mem_data->totalhigh = P2K(val.totalhigh);
      mem_data->freehigh  = P2K(val.freehigh);
      mem_data->bufferram = P2K(val.bufferram);
      mem_data->cached    = P2K(global_page_state(NR_FILE_PAGES)
                        - val.bufferram);

      si_swapinfo(&val);
      mem_data->totalswap = P2K(val.totalswap);
      mem_data->freeswap  = P2K(val.freeswap);

      mem_data->timestamp = get_clock();
      mem_data->sync_count_2++;
#ifdef APPLDATA_DEBUG
      appldata_debug_print(mem_data);
#endif
}


static struct appldata_ops ops = {
      .name      = "mem",
      .record_nr = APPLDATA_RECORD_MEM_ID,
      .size    = sizeof(struct appldata_mem_data),
      .callback  = &appldata_get_mem_data,
      .data      = &appldata_mem_data,
      .owner     = THIS_MODULE,
      .mod_lvl   = {0xF0, 0xF0},          /* EBCDIC "00" */
};


/*
 * appldata_mem_init()
 *
 * init_data, register ops
 */
static int __init appldata_mem_init(void)
{
      int rc;

      P_DEBUG("sizeof(mem) = %lu\n", sizeof(struct appldata_mem_data));

      rc = appldata_register_ops(&ops);
      if (rc != 0) {
            P_ERROR("Error registering ops, rc = %i\n", rc);
      } else {
            P_DEBUG("%s-ops registered!\n", ops.name);
      }
      return rc;
}

/*
 * appldata_mem_exit()
 *
 * unregister ops
 */
static void __exit appldata_mem_exit(void)
{
      appldata_unregister_ops(&ops);
      P_DEBUG("%s-ops unregistered!\n", ops.name);
}


module_init(appldata_mem_init);
module_exit(appldata_mem_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gerald Schaefer");
MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");

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