1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Data gathering module for Linux-VM Monitor Stream, Stage 1.
4*4882a593Smuzhiyun * Collects data related to memory management.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright IBM Corp. 2003, 2006
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/init.h>
13*4882a593Smuzhiyun #include <linux/errno.h>
14*4882a593Smuzhiyun #include <linux/kernel_stat.h>
15*4882a593Smuzhiyun #include <linux/pagemap.h>
16*4882a593Smuzhiyun #include <linux/swap.h>
17*4882a593Smuzhiyun #include <linux/slab.h>
18*4882a593Smuzhiyun #include <asm/io.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #include "appldata.h"
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun #define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /*
26*4882a593Smuzhiyun * Memory data
27*4882a593Smuzhiyun *
28*4882a593Smuzhiyun * This is accessed as binary data by z/VM. If changes to it can't be avoided,
29*4882a593Smuzhiyun * the structure version (product ID, see appldata_base.c) needs to be changed
30*4882a593Smuzhiyun * as well and all documentation and z/VM applications using it must be
31*4882a593Smuzhiyun * updated.
32*4882a593Smuzhiyun */
33*4882a593Smuzhiyun struct appldata_mem_data {
34*4882a593Smuzhiyun u64 timestamp;
35*4882a593Smuzhiyun u32 sync_count_1; /* after VM collected the record data, */
36*4882a593Smuzhiyun u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
37*4882a593Smuzhiyun same. If not, the record has been updated on
38*4882a593Smuzhiyun the Linux side while VM was collecting the
39*4882a593Smuzhiyun (possibly corrupt) data */
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun u64 pgpgin; /* data read from disk */
42*4882a593Smuzhiyun u64 pgpgout; /* data written to disk */
43*4882a593Smuzhiyun u64 pswpin; /* pages swapped in */
44*4882a593Smuzhiyun u64 pswpout; /* pages swapped out */
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun u64 sharedram; /* sharedram is currently set to 0 */
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun u64 totalram; /* total main memory size */
49*4882a593Smuzhiyun u64 freeram; /* free main memory size */
50*4882a593Smuzhiyun u64 totalhigh; /* total high memory size */
51*4882a593Smuzhiyun u64 freehigh; /* free high memory size */
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun u64 bufferram; /* memory reserved for buffers, free cache */
54*4882a593Smuzhiyun u64 cached; /* size of (used) cache, w/o buffers */
55*4882a593Smuzhiyun u64 totalswap; /* total swap space size */
56*4882a593Smuzhiyun u64 freeswap; /* free swap space */
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun // New in 2.6 -->
59*4882a593Smuzhiyun u64 pgalloc; /* page allocations */
60*4882a593Smuzhiyun u64 pgfault; /* page faults (major+minor) */
61*4882a593Smuzhiyun u64 pgmajfault; /* page faults (major only) */
62*4882a593Smuzhiyun // <-- New in 2.6
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun } __packed;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun /*
68*4882a593Smuzhiyun * appldata_get_mem_data()
69*4882a593Smuzhiyun *
70*4882a593Smuzhiyun * gather memory data
71*4882a593Smuzhiyun */
appldata_get_mem_data(void * data)72*4882a593Smuzhiyun static void appldata_get_mem_data(void *data)
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun /*
75*4882a593Smuzhiyun * don't put large structures on the stack, we are
76*4882a593Smuzhiyun * serialized through the appldata_ops_mutex and can use static
77*4882a593Smuzhiyun */
78*4882a593Smuzhiyun static struct sysinfo val;
79*4882a593Smuzhiyun unsigned long ev[NR_VM_EVENT_ITEMS];
80*4882a593Smuzhiyun struct appldata_mem_data *mem_data;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun mem_data = data;
83*4882a593Smuzhiyun mem_data->sync_count_1++;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun all_vm_events(ev);
86*4882a593Smuzhiyun mem_data->pgpgin = ev[PGPGIN] >> 1;
87*4882a593Smuzhiyun mem_data->pgpgout = ev[PGPGOUT] >> 1;
88*4882a593Smuzhiyun mem_data->pswpin = ev[PSWPIN];
89*4882a593Smuzhiyun mem_data->pswpout = ev[PSWPOUT];
90*4882a593Smuzhiyun mem_data->pgalloc = ev[PGALLOC_NORMAL];
91*4882a593Smuzhiyun mem_data->pgalloc += ev[PGALLOC_DMA];
92*4882a593Smuzhiyun mem_data->pgfault = ev[PGFAULT];
93*4882a593Smuzhiyun mem_data->pgmajfault = ev[PGMAJFAULT];
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun si_meminfo(&val);
96*4882a593Smuzhiyun mem_data->sharedram = val.sharedram;
97*4882a593Smuzhiyun mem_data->totalram = P2K(val.totalram);
98*4882a593Smuzhiyun mem_data->freeram = P2K(val.freeram);
99*4882a593Smuzhiyun mem_data->totalhigh = P2K(val.totalhigh);
100*4882a593Smuzhiyun mem_data->freehigh = P2K(val.freehigh);
101*4882a593Smuzhiyun mem_data->bufferram = P2K(val.bufferram);
102*4882a593Smuzhiyun mem_data->cached = P2K(global_node_page_state(NR_FILE_PAGES)
103*4882a593Smuzhiyun - val.bufferram);
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun si_swapinfo(&val);
106*4882a593Smuzhiyun mem_data->totalswap = P2K(val.totalswap);
107*4882a593Smuzhiyun mem_data->freeswap = P2K(val.freeswap);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun mem_data->timestamp = get_tod_clock();
110*4882a593Smuzhiyun mem_data->sync_count_2++;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun static struct appldata_ops ops = {
115*4882a593Smuzhiyun .name = "mem",
116*4882a593Smuzhiyun .record_nr = APPLDATA_RECORD_MEM_ID,
117*4882a593Smuzhiyun .size = sizeof(struct appldata_mem_data),
118*4882a593Smuzhiyun .callback = &appldata_get_mem_data,
119*4882a593Smuzhiyun .owner = THIS_MODULE,
120*4882a593Smuzhiyun .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
121*4882a593Smuzhiyun };
122*4882a593Smuzhiyun
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun /*
125*4882a593Smuzhiyun * appldata_mem_init()
126*4882a593Smuzhiyun *
127*4882a593Smuzhiyun * init_data, register ops
128*4882a593Smuzhiyun */
appldata_mem_init(void)129*4882a593Smuzhiyun static int __init appldata_mem_init(void)
130*4882a593Smuzhiyun {
131*4882a593Smuzhiyun int ret;
132*4882a593Smuzhiyun
133*4882a593Smuzhiyun ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
134*4882a593Smuzhiyun if (!ops.data)
135*4882a593Smuzhiyun return -ENOMEM;
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun ret = appldata_register_ops(&ops);
138*4882a593Smuzhiyun if (ret)
139*4882a593Smuzhiyun kfree(ops.data);
140*4882a593Smuzhiyun
141*4882a593Smuzhiyun return ret;
142*4882a593Smuzhiyun }
143*4882a593Smuzhiyun
144*4882a593Smuzhiyun /*
145*4882a593Smuzhiyun * appldata_mem_exit()
146*4882a593Smuzhiyun *
147*4882a593Smuzhiyun * unregister ops
148*4882a593Smuzhiyun */
appldata_mem_exit(void)149*4882a593Smuzhiyun static void __exit appldata_mem_exit(void)
150*4882a593Smuzhiyun {
151*4882a593Smuzhiyun appldata_unregister_ops(&ops);
152*4882a593Smuzhiyun kfree(ops.data);
153*4882a593Smuzhiyun }
154*4882a593Smuzhiyun
155*4882a593Smuzhiyun
156*4882a593Smuzhiyun module_init(appldata_mem_init);
157*4882a593Smuzhiyun module_exit(appldata_mem_exit);
158*4882a593Smuzhiyun
159*4882a593Smuzhiyun MODULE_LICENSE("GPL");
160*4882a593Smuzhiyun MODULE_AUTHOR("Gerald Schaefer");
161*4882a593Smuzhiyun MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
162