1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
  4 * Collects data related to memory management.
  5 *
  6 * Copyright IBM Corp. 2003, 2006
  7 *
  8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  9 */
 10
 11#include <linux/module.h>
 12#include <linux/init.h>
 13#include <linux/errno.h>
 14#include <linux/kernel_stat.h>
 15#include <linux/pagemap.h>
 16#include <linux/swap.h>
 17#include <linux/slab.h>
 18#include <asm/io.h>
 19
 20#include "appldata.h"
 21
 22
 23#define P2K(x) ((x) << (PAGE_SHIFT - 10))	/* Converts #Pages to KB */
 24
 25/*
 26 * Memory data
 27 *
 28 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 29 * the structure version (product ID, see appldata_base.c) needs to be changed
 30 * as well and all documentation and z/VM applications using it must be
 31 * updated.
 
 
 
 
 32 */
 33struct appldata_mem_data {
 34	u64 timestamp;
 35	u32 sync_count_1;       /* after VM collected the record data, */
 36	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
 37				   same. If not, the record has been updated on
 38				   the Linux side while VM was collecting the
 39				   (possibly corrupt) data */
 40
 41	u64 pgpgin;		/* data read from disk  */
 42	u64 pgpgout;		/* data written to disk */
 43	u64 pswpin;		/* pages swapped in  */
 44	u64 pswpout;		/* pages swapped out */
 45
 46	u64 sharedram;		/* sharedram is currently set to 0 */
 47
 48	u64 totalram;		/* total main memory size */
 49	u64 freeram;		/* free main memory size  */
 50	u64 totalhigh;		/* total high memory size */
 51	u64 freehigh;		/* free high memory size  */
 52
 53	u64 bufferram;		/* memory reserved for buffers, free cache */
 54	u64 cached;		/* size of (used) cache, w/o buffers */
 55	u64 totalswap;		/* total swap space size */
 56	u64 freeswap;		/* free swap space */
 57
 58// New in 2.6 -->
 59	u64 pgalloc;		/* page allocations */
 60	u64 pgfault;		/* page faults (major+minor) */
 61	u64 pgmajfault;		/* page faults (major only) */
 62// <-- New in 2.6
 63
 64} __packed;
 65
 66
 67/*
 68 * appldata_get_mem_data()
 69 *
 70 * gather memory data
 71 */
 72static void appldata_get_mem_data(void *data)
 73{
 74	/*
 75	 * don't put large structures on the stack, we are
 76	 * serialized through the appldata_ops_mutex and can use static
 77	 */
 78	static struct sysinfo val;
 79	unsigned long ev[NR_VM_EVENT_ITEMS];
 80	struct appldata_mem_data *mem_data;
 81
 82	mem_data = data;
 83	mem_data->sync_count_1++;
 84
 85	all_vm_events(ev);
 86	mem_data->pgpgin     = ev[PGPGIN] >> 1;
 87	mem_data->pgpgout    = ev[PGPGOUT] >> 1;
 88	mem_data->pswpin     = ev[PSWPIN];
 89	mem_data->pswpout    = ev[PSWPOUT];
 90	mem_data->pgalloc    = ev[PGALLOC_NORMAL];
 91	mem_data->pgalloc    += ev[PGALLOC_DMA];
 92	mem_data->pgfault    = ev[PGFAULT];
 93	mem_data->pgmajfault = ev[PGMAJFAULT];
 94
 95	si_meminfo(&val);
 96	mem_data->sharedram = val.sharedram;
 97	mem_data->totalram  = P2K(val.totalram);
 98	mem_data->freeram   = P2K(val.freeram);
 99	mem_data->totalhigh = P2K(val.totalhigh);
100	mem_data->freehigh  = P2K(val.freehigh);
101	mem_data->bufferram = P2K(val.bufferram);
102	mem_data->cached    = P2K(global_node_page_state(NR_FILE_PAGES)
103				- val.bufferram);
104
105	si_swapinfo(&val);
106	mem_data->totalswap = P2K(val.totalswap);
107	mem_data->freeswap  = P2K(val.freeswap);
108
109	mem_data->timestamp = get_tod_clock();
110	mem_data->sync_count_2++;
111}
112
113
114static struct appldata_ops ops = {
115	.name      = "mem",
116	.record_nr = APPLDATA_RECORD_MEM_ID,
117	.size	   = sizeof(struct appldata_mem_data),
118	.callback  = &appldata_get_mem_data,
119	.owner     = THIS_MODULE,
120	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
121};
122
123
124/*
125 * appldata_mem_init()
126 *
127 * init_data, register ops
128 */
129static int __init appldata_mem_init(void)
130{
131	int ret;
132
133	ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
134	if (!ops.data)
135		return -ENOMEM;
136
137	ret = appldata_register_ops(&ops);
138	if (ret)
139		kfree(ops.data);
140
141	return ret;
142}
143
144/*
145 * appldata_mem_exit()
146 *
147 * unregister ops
148 */
149static void __exit appldata_mem_exit(void)
150{
151	appldata_unregister_ops(&ops);
152	kfree(ops.data);
153}
154
155
156module_init(appldata_mem_init);
157module_exit(appldata_mem_exit);
158
159MODULE_LICENSE("GPL");
160MODULE_AUTHOR("Gerald Schaefer");
161MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");

 
  1/*
  2 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
  3 * Collects data related to memory management.
  4 *
  5 * Copyright IBM Corp. 2003, 2006
  6 *
  7 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  8 */
  9
 10#include <linux/module.h>
 11#include <linux/init.h>
 12#include <linux/errno.h>
 13#include <linux/kernel_stat.h>
 14#include <linux/pagemap.h>
 15#include <linux/swap.h>
 
 16#include <asm/io.h>
 17
 18#include "appldata.h"
 19
 20
 21#define P2K(x) ((x) << (PAGE_SHIFT - 10))	/* Converts #Pages to KB */
 22
 23/*
 24 * Memory data
 25 *
 26 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 27 * the structure version (product ID, see appldata_base.c) needs to be changed
 28 * as well and all documentation and z/VM applications using it must be
 29 * updated.
 30 *
 31 * The record layout is documented in the Linux for zSeries Device Drivers
 32 * book:
 33 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
 34 */
 35struct appldata_mem_data {
 36	u64 timestamp;
 37	u32 sync_count_1;       /* after VM collected the record data, */
 38	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
 39				   same. If not, the record has been updated on
 40				   the Linux side while VM was collecting the
 41				   (possibly corrupt) data */
 42
 43	u64 pgpgin;		/* data read from disk  */
 44	u64 pgpgout;		/* data written to disk */
 45	u64 pswpin;		/* pages swapped in  */
 46	u64 pswpout;		/* pages swapped out */
 47
 48	u64 sharedram;		/* sharedram is currently set to 0 */
 49
 50	u64 totalram;		/* total main memory size */
 51	u64 freeram;		/* free main memory size  */
 52	u64 totalhigh;		/* total high memory size */
 53	u64 freehigh;		/* free high memory size  */
 54
 55	u64 bufferram;		/* memory reserved for buffers, free cache */
 56	u64 cached;		/* size of (used) cache, w/o buffers */
 57	u64 totalswap;		/* total swap space size */
 58	u64 freeswap;		/* free swap space */
 59
 60// New in 2.6 -->
 61	u64 pgalloc;		/* page allocations */
 62	u64 pgfault;		/* page faults (major+minor) */
 63	u64 pgmajfault;		/* page faults (major only) */
 64// <-- New in 2.6
 65
 66} __packed;
 67
 68
 69/*
 70 * appldata_get_mem_data()
 71 *
 72 * gather memory data
 73 */
 74static void appldata_get_mem_data(void *data)
 75{
 76	/*
 77	 * don't put large structures on the stack, we are
 78	 * serialized through the appldata_ops_mutex and can use static
 79	 */
 80	static struct sysinfo val;
 81	unsigned long ev[NR_VM_EVENT_ITEMS];
 82	struct appldata_mem_data *mem_data;
 83
 84	mem_data = data;
 85	mem_data->sync_count_1++;
 86
 87	all_vm_events(ev);
 88	mem_data->pgpgin     = ev[PGPGIN] >> 1;
 89	mem_data->pgpgout    = ev[PGPGOUT] >> 1;
 90	mem_data->pswpin     = ev[PSWPIN];
 91	mem_data->pswpout    = ev[PSWPOUT];
 92	mem_data->pgalloc    = ev[PGALLOC_NORMAL];
 93	mem_data->pgalloc    += ev[PGALLOC_DMA];
 94	mem_data->pgfault    = ev[PGFAULT];
 95	mem_data->pgmajfault = ev[PGMAJFAULT];
 96
 97	si_meminfo(&val);
 98	mem_data->sharedram = val.sharedram;
 99	mem_data->totalram  = P2K(val.totalram);
100	mem_data->freeram   = P2K(val.freeram);
101	mem_data->totalhigh = P2K(val.totalhigh);
102	mem_data->freehigh  = P2K(val.freehigh);
103	mem_data->bufferram = P2K(val.bufferram);
104	mem_data->cached    = P2K(global_page_state(NR_FILE_PAGES)
105				- val.bufferram);
106
107	si_swapinfo(&val);
108	mem_data->totalswap = P2K(val.totalswap);
109	mem_data->freeswap  = P2K(val.freeswap);
110
111	mem_data->timestamp = get_tod_clock();
112	mem_data->sync_count_2++;
113}
114
115
116static struct appldata_ops ops = {
117	.name      = "mem",
118	.record_nr = APPLDATA_RECORD_MEM_ID,
119	.size	   = sizeof(struct appldata_mem_data),
120	.callback  = &appldata_get_mem_data,
121	.owner     = THIS_MODULE,
122	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
123};
124
125
126/*
127 * appldata_mem_init()
128 *
129 * init_data, register ops
130 */
131static int __init appldata_mem_init(void)
132{
133	int ret;
134
135	ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
136	if (!ops.data)
137		return -ENOMEM;
138
139	ret = appldata_register_ops(&ops);
140	if (ret)
141		kfree(ops.data);
142
143	return ret;
144}
145
146/*
147 * appldata_mem_exit()
148 *
149 * unregister ops
150 */
151static void __exit appldata_mem_exit(void)
152{
153	appldata_unregister_ops(&ops);
154	kfree(ops.data);
155}
156
157
158module_init(appldata_mem_init);
159module_exit(appldata_mem_exit);
160
161MODULE_LICENSE("GPL");
162MODULE_AUTHOR("Gerald Schaefer");
163MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");