src/libstatgrab/memory_stats.c

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org
 * Copyright (C) 2000-2003 i-scream
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "statgrab.h"
#include "tools.h"
#ifdef SOLARIS
#include <unistd.h>
#include <kstat.h>
#endif
#ifdef LINUX
#include <stdio.h>
#include <string.h>
#endif
#ifdef FREEBSD
#include <sys/types.h>
#include <sys/sysctl.h>
#include <unistd.h>
#endif

mem_stat_t *get_memory_stats(){

        static mem_stat_t mem_stat;

#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        kstat_named_t *kn;
        long totalmem;
        int pagesize;
#endif
#ifdef LINUX
        char *line_ptr;
        unsigned long long value;
        FILE *f;
#endif
#ifdef FREEBSD
        int mib[2];
        u_long physmem;
        size_t size;
        u_int free_count;
        u_int cache_count;
        u_int inactive_count;
        int pagesize;
#endif
#ifdef NETBSD
        struct uvmexp *uvm;
#endif

#ifdef SOLARIS
        if((pagesize=sysconf(_SC_PAGESIZE)) == -1){
                return NULL;    
        }

        if((totalmem=sysconf(_SC_PHYS_PAGES)) == -1){
                return NULL;
        }

        if ((kc = kstat_open()) == NULL) {
                return NULL;
        }
        if((ksp=kstat_lookup(kc, "unix", 0, "system_pages")) == NULL){
                return NULL;
        }
        if (kstat_read(kc, ksp, 0) == -1) {
                return NULL;
        }
        if((kn=kstat_data_lookup(ksp, "freemem")) == NULL){
                return NULL;
        }
        kstat_close(kc);

        mem_stat.total = (long long)totalmem * (long long)pagesize;
        mem_stat.free = ((long long)kn->value.ul) * (long long)pagesize;
        mem_stat.used = mem_stat.total - mem_stat.free;
#endif

#ifdef LINUX
        if ((f = fopen("/proc/meminfo", "r")) == NULL) {
                return NULL;
        }

        while ((line_ptr = f_read_line(f, "")) != NULL) {
                if (sscanf(line_ptr, "%*s %llu kB", &value) != 1) {
                        continue;
                }
                value *= 1024;

                if (strncmp(line_ptr, "MemTotal:", 9) == 0) {
                        mem_stat.total = value;
                } else if (strncmp(line_ptr, "MemFree:", 8) == 0) {
                        mem_stat.free = value;
                } else if (strncmp(line_ptr, "Cached:", 7) == 0) {
                        mem_stat.cache = value;
                }
        }

        fclose(f);
        mem_stat.used = mem_stat.total - mem_stat.free;
#endif

#ifdef FREEBSD
        /* Returns bytes */
        mib[0] = CTL_HW;
        mib[1] = HW_PHYSMEM;
        size = sizeof physmem;
        if (sysctl(mib, 2, &physmem, &size, NULL, 0) < 0) {
                return NULL;
        }
        mem_stat.total = physmem;

        /*returns pages*/
        size = sizeof free_count;
        if (sysctlbyname("vm.stats.vm.v_free_count", &free_count, &size, NULL, 0) < 0){
                return NULL;
        }

        size = sizeof inactive_count;
        if (sysctlbyname("vm.stats.vm.v_inactive_count", &inactive_count , &size, NULL, 0) < 0){
                return NULL;
        }

        size = sizeof cache_count;
        if (sysctlbyname("vm.stats.vm.v_cache_count", &cache_count, &size, NULL, 0) < 0){
                return NULL;
        }

        /* Because all the vm.stats returns pages, I need to get the page size.
         * After that I then need to multiple the anything that used vm.stats to
         * get the system statistics by pagesize 
         */
        if ((pagesize=getpagesize()) == -1){
                return NULL;
        }

        mem_stat.cache=cache_count*pagesize;

        /* Of couse nothing is ever that simple :) And I have inactive pages to
         * deal with too. So I'm going to add them to free memory :)
         */
        mem_stat.free=(free_count*pagesize)+(inactive_count*pagesize);
        mem_stat.used=physmem-mem_stat.free;
#endif

#ifdef NETBSD
        if ((uvm = get_uvmexp()) == NULL) {
                return NULL;
        }
        mem_stat.total = uvm->pagesize * uvm->npages;
        mem_stat.cache = uvm->pagesize * (uvm->filepages + uvm->execpages);
        mem_stat.free = uvm->pagesize * (uvm->free + uvm->inactive);
        mem_stat.used = mem_stat.total - mem_stat.free;
#endif

        return &mem_stat;
}
Revision:	1.16
Committed:	Fri Oct 24 17:26:43 2003 UTC (20 years, 6 months ago) by ats
Content type:	text/plain
Branch:	MAIN
Changes since 1.15:	+2 -3 lines
Log Message:	Support memory, swap and paging stats on Linux 2.6. For memory and swap, this just means reading the new-style data in /proc/meminfo (since it's present in 2.2 and 2.4 too); for paging, this means trying to read /proc/vmstat if it's available, else reading /proc/stat (for 2.2).
#	User	Rev	Content
1	pajs	1.1	/*
2			* i-scream central monitoring system
3	tdb	1.7	* http://www.i-scream.org
4			* Copyright (C) 2000-2003 i-scream
5	pajs	1.1	*
6			* This program is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19			*/
20
21			#ifdef HAVE_CONFIG_H
22			#include "config.h"
23			#endif
24
25			#include "statgrab.h"
26	ats	1.12	#include "tools.h"
27	pajs	1.1	#ifdef SOLARIS
28			#include <unistd.h>
29			#include <kstat.h>
30			#endif
31	pajs	1.5	#ifdef LINUX
32			#include <stdio.h>
33			#include <string.h>
34			#endif
35	pajs	1.6	#ifdef FREEBSD
36			#include <sys/types.h>
37			#include <sys/sysctl.h>
38			#include <unistd.h>
39			#endif
40	pajs	1.1
41			mem_stat_t *get_memory_stats(){
42
43			static mem_stat_t mem_stat;
44
45			#ifdef SOLARIS
46			kstat_ctl_t *kc;
47			kstat_t *ksp;
48			kstat_named_t *kn;
49			long totalmem;
50			int pagesize;
51			#endif
52	pajs	1.5	#ifdef LINUX
53			char *line_ptr;
54	ats	1.15	unsigned long long value;
55	pajs	1.5	FILE *f;
56			#endif
57	ats	1.14	#ifdef FREEBSD
58	ats	1.12	int mib[2];
59	ats	1.14	u_long physmem;
60			size_t size;
61	tdb	1.8	u_int free_count;
62			u_int cache_count;
63			u_int inactive_count;
64	ats	1.12	int pagesize;
65			#endif
66			#ifdef NETBSD
67			struct uvmexp *uvm;
68			#endif
69	pajs	1.1
70			#ifdef SOLARIS
71			if((pagesize=sysconf(_SC_PAGESIZE)) == -1){
72			return NULL;
73			}
74
75			if((totalmem=sysconf(_SC_PHYS_PAGES)) == -1){
76			return NULL;
77			}
78
79			if ((kc = kstat_open()) == NULL) {
80			return NULL;
81			}
82			if((ksp=kstat_lookup(kc, "unix", 0, "system_pages")) == NULL){
83			return NULL;
84			}
85			if (kstat_read(kc, ksp, 0) == -1) {
86			return NULL;
87			}
88			if((kn=kstat_data_lookup(ksp, "freemem")) == NULL){
89			return NULL;
90			}
91	pajs	1.2	kstat_close(kc);
92
93	pajs	1.1	mem_stat.total = (long long)totalmem * (long long)pagesize;
94			mem_stat.free = ((long long)kn->value.ul) * (long long)pagesize;
95			mem_stat.used = mem_stat.total - mem_stat.free;
96	pajs	1.5	#endif
97
98			#ifdef LINUX
99	ats	1.16	if ((f = fopen("/proc/meminfo", "r")) == NULL) {
100	pajs	1.5	return NULL;
101			}
102
103	ats	1.15	while ((line_ptr = f_read_line(f, "")) != NULL) {
104	ats	1.16	if (sscanf(line_ptr, "%*s %llu kB", &value) != 1) {
105	ats	1.15	continue;
106			}
107			value *= 1024;
108
109			if (strncmp(line_ptr, "MemTotal:", 9) == 0) {
110			mem_stat.total = value;
111			} else if (strncmp(line_ptr, "MemFree:", 8) == 0) {
112			mem_stat.free = value;
113			} else if (strncmp(line_ptr, "Cached:", 7) == 0) {
114			mem_stat.cache = value;
115			}
116	pajs	1.5	}
117
118			fclose(f);
119	ats	1.15	mem_stat.used = mem_stat.total - mem_stat.free;
120	pajs	1.6	#endif
121
122	ats	1.14	#ifdef FREEBSD
123	tdb	1.8	/* Returns bytes */
124	ats	1.12	mib[0] = CTL_HW;
125			mib[1] = HW_PHYSMEM;
126	ats	1.11	size = sizeof physmem;
127	ats	1.12	if (sysctl(mib, 2, &physmem, &size, NULL, 0) < 0) {
128	pajs	1.6	return NULL;
129	ats	1.12	}
130			mem_stat.total = physmem;
131	pajs	1.6
132			/returns pages/
133	ats	1.11	size = sizeof free_count;
134	ats	1.10	if (sysctlbyname("vm.stats.vm.v_free_count", &free_count, &size, NULL, 0) < 0){
135	pajs	1.6	return NULL;
136			}
137
138	ats	1.11	size = sizeof inactive_count;
139	ats	1.10	if (sysctlbyname("vm.stats.vm.v_inactive_count", &inactive_count , &size, NULL, 0) < 0){
140	pajs	1.6	return NULL;
141			}
142
143	ats	1.11	size = sizeof cache_count;
144	ats	1.10	if (sysctlbyname("vm.stats.vm.v_cache_count", &cache_count, &size, NULL, 0) < 0){
145	pajs	1.6	return NULL;
146			}
147
148	tdb	1.8	/* Because all the vm.stats returns pages, I need to get the page size.
149			* After that I then need to multiple the anything that used vm.stats to
150			* get the system statistics by pagesize
151	pajs	1.6	*/
152			if ((pagesize=getpagesize()) == -1){
153			return NULL;
154			}
155
156	tdb	1.8	mem_stat.cache=cache_count*pagesize;
157
158			/* Of couse nothing is ever that simple :) And I have inactive pages to
159			* deal with too. So I'm going to add them to free memory :)
160	pajs	1.6	*/
161	tdb	1.8	mem_stat.free=(free_countpagesize)+(inactive_countpagesize);
162			mem_stat.used=physmem-mem_stat.free;
163	ats	1.12	#endif
164	ats	1.14
165	ats	1.12	#ifdef NETBSD
166			if ((uvm = get_uvmexp()) == NULL) {
167			return NULL;
168			}
169	ats	1.14	mem_stat.total = uvm->pagesize * uvm->npages;
170	ats	1.12	mem_stat.cache = uvm->pagesize * (uvm->filepages + uvm->execpages);
171	ats	1.14	mem_stat.free = uvm->pagesize * (uvm->free + uvm->inactive);
172			mem_stat.used = mem_stat.total - mem_stat.free;
173	pajs	1.1	#endif
174
175			return &mem_stat;
176			}