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// SPDX-License-Identifier: GPL-2.0
/*
* Data gathering module for Linux-VM Monitor Stream, Stage 1.
* Collects data related to memory management.
*
* Copyright IBM Corp. 2003, 2006
*
* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <asm/io.h>
#include "appldata.h"
#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
*/
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
} __packed;
/*
* 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_mutex 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];
mem_data->pgalloc += ev[PGALLOC_DMA];
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_node_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_tod_clock();
mem_data->sync_count_2++;
}
static struct appldata_ops ops = {
.name = "mem",
.record_nr = APPLDATA_RECORD_MEM_ID,
.size = sizeof(struct appldata_mem_data),
.callback = &appldata_get_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 ret;
ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
if (!ops.data)
return -ENOMEM;
ret = appldata_register_ops(&ops);
if (ret)
kfree(ops.data);
return ret;
}
/*
* appldata_mem_exit()
*
* unregister ops
*/
static void __exit appldata_mem_exit(void)
{
appldata_unregister_ops(&ops);
kfree(ops.data);
}
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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