Subversion Repositories test_project

/*

 * 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");