src/libstatgrab/page_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"
#include <time.h>
#ifdef SOLARIS
#include <kstat.h>
#include <sys/sysinfo.h>
#include <string.h>
#endif
#ifdef LINUX
#include <stdio.h>
#include <string.h>
#endif
#ifdef FREEBSD
#include <sys/types.h>
#include <sys/sysctl.h>
#endif

static page_stat_t page_stats;
static int page_stats_uninit=1;

page_stat_t *get_page_stats(){
#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        cpu_stat_t cs;
#endif
#ifdef LINUX
        FILE *f;
        char *line_ptr;
#endif
#ifdef FREEBSD
        size_t size;
#endif
#ifdef NETBSD
        struct uvmexp *uvm;
#endif

        page_stats.systime = time(NULL);
        page_stats.pages_pagein=0;
        page_stats.pages_pageout=0;

#ifdef SOLARIS
        if ((kc = kstat_open()) == NULL) {
                return NULL;
        }
        for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
                if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
                if (kstat_read(kc, ksp, &cs) == -1) {
                        continue;
                }

                page_stats.pages_pagein+=(long long)cs.cpu_vminfo.pgpgin;
                page_stats.pages_pageout+=(long long)cs.cpu_vminfo.pgpgout;
        }

        kstat_close(kc);
#endif
#ifdef LINUX
        if ((f = fopen("/proc/vmstat", "r")) != NULL) {
                while ((line_ptr = f_read_line(f, "")) != NULL) {
                        long long value;

                        if (sscanf(line_ptr, "%*s %lld", &value) != 1) {
                                continue;
                        }

                        if (strncmp(line_ptr, "pgpgin ", 7) == 0) {
                                page_stats.pages_pagein = value;
                        } else if (strncmp(line_ptr, "pgpgout ", 8) == 0) {
                                page_stats.pages_pageout = value;
                        }
                }

                fclose(f);
        } else if ((f = fopen("/proc/stat", "r")) != NULL) {
                if ((line_ptr = f_read_line(f, "page")) == NULL) {
                        fclose(f);
                        return NULL;
                }

                if (sscanf(line_ptr, "page %lld %lld", &page_stats.pages_pagein, &page_stats.pages_pageout) != 2) {
                        return NULL;
                }

                fclose(f);
        } else {
                return NULL;
        }
#endif
#ifdef FREEBSD
        size = sizeof page_stats.pages_pagein;
        if (sysctlbyname("vm.stats.vm.v_swappgsin", &page_stats.pages_pagein, &size, NULL, 0) < 0){
                return NULL;
        }
        size = sizeof page_stats.pages_pageout;
        if (sysctlbyname("vm.stats.vm.v_swappgsout", &page_stats.pages_pageout, &size, NULL, 0) < 0){
                return NULL;
        }
#endif
#ifdef NETBSD
        if ((uvm = get_uvmexp()) == NULL) {
                return NULL;
        }
        page_stats.pages_pagein = uvm->pgswapin;
        page_stats.pages_pageout = uvm->pgswapout;
#endif

        return &page_stats;
}

page_stat_t *get_page_stats_diff(){
        page_stat_t *page_ptr;
        static page_stat_t page_stats_diff;

        if(page_stats_uninit){
                page_ptr=get_page_stats();
                if(page_ptr==NULL){
                        return NULL;
                }
                page_stats_uninit=0;
                return page_ptr;
        }

        page_stats_diff.pages_pagein=page_stats.pages_pagein;
        page_stats_diff.pages_pageout=page_stats.pages_pageout;
        page_stats_diff.systime=page_stats.systime;

        page_ptr=get_page_stats();
        if(page_ptr==NULL){
                return NULL;
        }

        page_stats_diff.pages_pagein=page_stats.pages_pagein-page_stats_diff.pages_pagein;
        page_stats_diff.pages_pageout=page_stats.pages_pageout-page_stats_diff.pages_pageout;
        page_stats_diff.systime=page_stats.systime-page_stats_diff.systime;
        
        return &page_stats_diff;
}
Revision:	1.10
Committed:	Fri Oct 24 17:26:43 2003 UTC (20 years, 6 months ago) by ats
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+28 -9 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	1.6	* 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	pajs	1.2	#include "statgrab.h"
26	ats	1.9	#include "tools.h"
27	pajs	1.4	#include <time.h>
28	pajs	1.1	#ifdef SOLARIS
29			#include <kstat.h>
30			#include <sys/sysinfo.h>
31	pajs	1.2	#include <string.h>
32	pajs	1.1	#endif
33	pajs	1.4	#ifdef LINUX
34			#include <stdio.h>
35	ats	1.10	#include <string.h>
36	pajs	1.4	#endif
37	pajs	1.5	#ifdef FREEBSD
38			#include <sys/types.h>
39			#include <sys/sysctl.h>
40			#endif
41	pajs	1.3
42			static page_stat_t page_stats;
43			static int page_stats_uninit=1;
44
45	pajs	1.1	page_stat_t *get_page_stats(){
46	pajs	1.4	#ifdef SOLARIS
47	pajs	1.1	kstat_ctl_t *kc;
48			kstat_t *ksp;
49			cpu_stat_t cs;
50	pajs	1.4	#endif
51			#ifdef LINUX
52			FILE *f;
53			char *line_ptr;
54			#endif
55	pajs	1.5	#ifdef FREEBSD
56			size_t size;
57			#endif
58	ats	1.9	#ifdef NETBSD
59			struct uvmexp *uvm;
60			#endif
61	pajs	1.2
62	ats	1.9	page_stats.systime = time(NULL);
63	pajs	1.2	page_stats.pages_pagein=0;
64			page_stats.pages_pageout=0;
65	pajs	1.1
66	pajs	1.4	#ifdef SOLARIS
67	pajs	1.1	if ((kc = kstat_open()) == NULL) {
68			return NULL;
69			}
70			for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
71			if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
72			if (kstat_read(kc, ksp, &cs) == -1) {
73			continue;
74			}
75
76	pajs	1.2	page_stats.pages_pagein+=(long long)cs.cpu_vminfo.pgpgin;
77			page_stats.pages_pageout+=(long long)cs.cpu_vminfo.pgpgout;
78			}
79
80			kstat_close(kc);
81	pajs	1.4	#endif
82			#ifdef LINUX
83	ats	1.10	if ((f = fopen("/proc/vmstat", "r")) != NULL) {
84			while ((line_ptr = f_read_line(f, "")) != NULL) {
85			long long value;
86
87			if (sscanf(line_ptr, "%*s %lld", &value) != 1) {
88			continue;
89			}
90
91			if (strncmp(line_ptr, "pgpgin ", 7) == 0) {
92			page_stats.pages_pagein = value;
93			} else if (strncmp(line_ptr, "pgpgout ", 8) == 0) {
94			page_stats.pages_pageout = value;
95			}
96			}
97
98			fclose(f);
99			} else if ((f = fopen("/proc/stat", "r")) != NULL) {
100			if ((line_ptr = f_read_line(f, "page")) == NULL) {
101			fclose(f);
102			return NULL;
103			}
104
105			if (sscanf(line_ptr, "page %lld %lld", &page_stats.pages_pagein, &page_stats.pages_pageout) != 2) {
106			return NULL;
107			}
108
109	pajs	1.4	fclose(f);
110	ats	1.10	} else {
111	pajs	1.4	return NULL;
112			}
113	pajs	1.5	#endif
114			#ifdef FREEBSD
115	ats	1.8	size = sizeof page_stats.pages_pagein;
116	ats	1.7	if (sysctlbyname("vm.stats.vm.v_swappgsin", &page_stats.pages_pagein, &size, NULL, 0) < 0){
117	pajs	1.5	return NULL;
118			}
119	ats	1.8	size = sizeof page_stats.pages_pageout;
120	ats	1.7	if (sysctlbyname("vm.stats.vm.v_swappgsout", &page_stats.pages_pageout, &size, NULL, 0) < 0){
121	pajs	1.5	return NULL;
122			}
123	ats	1.9	#endif
124			#ifdef NETBSD
125			if ((uvm = get_uvmexp()) == NULL) {
126			return NULL;
127			}
128			page_stats.pages_pagein = uvm->pgswapin;
129			page_stats.pages_pageout = uvm->pgswapout;
130	pajs	1.4	#endif
131	pajs	1.1
132	pajs	1.2	return &page_stats;
133	pajs	1.3	}
134
135			page_stat_t *get_page_stats_diff(){
136			page_stat_t *page_ptr;
137			static page_stat_t page_stats_diff;
138
139			if(page_stats_uninit){
140			page_ptr=get_page_stats();
141			if(page_ptr==NULL){
142			return NULL;
143			}
144			page_stats_uninit=0;
145			return page_ptr;
146			}
147
148			page_stats_diff.pages_pagein=page_stats.pages_pagein;
149			page_stats_diff.pages_pageout=page_stats.pages_pageout;
150			page_stats_diff.systime=page_stats.systime;
151
152			page_ptr=get_page_stats();
153			if(page_ptr==NULL){
154			return NULL;
155			}
156
157			page_stats_diff.pages_pagein=page_stats.pages_pagein-page_stats_diff.pages_pagein;
158			page_stats_diff.pages_pageout=page_stats.pages_pageout-page_stats_diff.pages_pageout;
159			page_stats_diff.systime=page_stats.systime-page_stats_diff.systime;
160
161			return &page_stats_diff;
162	pajs	1.1	}