1 /**
2 * collectd - src/memory.c
3 * Copyright (C) 2005 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 **/
23 #include "memory.h"
25 #if COLLECT_MEMORY
26 #define MODULE_NAME "memory"
28 #include "plugin.h"
29 #include "common.h"
31 static char *memory_file = "memory.rrd";
33 /* 9223372036854775807 == LLONG_MAX */
34 static char *ds_def[] =
35 {
36 "DS:used:GAUGE:25:0:9223372036854775807",
37 "DS:free:GAUGE:25:0:9223372036854775807",
38 "DS:buffers:GAUGE:25:0:9223372036854775807",
39 "DS:cached:GAUGE:25:0:9223372036854775807",
40 NULL
41 };
42 static int ds_num = 4;
44 #ifdef HAVE_LIBKSTAT
45 static int pagesize;
46 static kstat_t *ksp;
47 #endif /* HAVE_LIBKSTAT */
49 void memory_init (void)
50 {
51 #ifdef HAVE_LIBKSTAT
52 /* getpagesize(3C) tells me this does not fail.. */
53 pagesize = getpagesize ();
54 if (get_kstat (&ksp, "unix", 0, "system_pages"))
55 ksp = NULL;
56 #endif /* HAVE_LIBKSTAT */
58 return;
59 }
61 void memory_write (char *host, char *inst, char *val)
62 {
63 rrd_update_file (host, memory_file, val, ds_def, ds_num);
64 }
66 #define BUFSIZE 512
67 void memory_submit (long long mem_used, long long mem_buffered,
68 long long mem_cached, long long mem_free)
69 {
70 char buf[BUFSIZE];
72 if (snprintf (buf, BUFSIZE, "%u:%lli:%lli:%lli:%lli",
73 (unsigned int) curtime, mem_used, mem_free,
74 mem_buffered, mem_cached) >= BUFSIZE)
75 return;
77 plugin_submit (MODULE_NAME, "-", buf);
78 }
79 #undef BUFSIZE
81 void memory_read (void)
82 {
83 #ifdef KERNEL_LINUX
84 FILE *fh;
85 char buffer[1024];
87 char *fields[8];
88 int numfields;
90 long long mem_used = 0;
91 long long mem_buffered = 0;
92 long long mem_cached = 0;
93 long long mem_free = 0;
95 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
96 {
97 syslog (LOG_WARNING, "memory: fopen: %s", strerror (errno));
98 return;
99 }
101 while (fgets (buffer, 1024, fh) != NULL)
102 {
103 long long *val = NULL;
105 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
106 val = &mem_used;
107 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
108 val = &mem_free;
109 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
110 val = &mem_buffered;
111 else if (strncasecmp (buffer, "Cached:", 7) == 0)
112 val = &mem_cached;
113 else
114 continue;
116 numfields = strsplit (buffer, fields, 8);
118 if (numfields < 2)
119 continue;
121 *val = atoll (fields[1]) * 1024LL;
122 }
124 if (fclose (fh))
125 syslog (LOG_WARNING, "memory: fclose: %s", strerror (errno));
127 if (mem_used >= (mem_free + mem_buffered + mem_cached))
128 {
129 mem_used -= mem_free + mem_buffered + mem_cached;
130 memory_submit (mem_used, mem_buffered, mem_cached, mem_free);
131 }
132 /* #endif defined(KERNEL_LINUX) */
134 #elif defined(HAVE_LIBKSTAT)
135 long long mem_used;
136 long long mem_free;
137 long long mem_lock;
139 if (ksp == NULL)
140 return;
142 mem_used = get_kstat_value (ksp, "pagestotal");
143 mem_free = get_kstat_value (ksp, "pagesfree");
144 mem_lock = get_kstat_value (ksp, "pageslocked");
146 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
147 return;
148 if (mem_used < (mem_free + mem_lock))
149 return;
151 mem_used -= mem_free + mem_lock;
152 mem_used *= pagesize; /* If this overflows you have some serious */
153 mem_free *= pagesize; /* memory.. Why not call me up and give me */
154 mem_lock *= pagesize; /* some? ;) */
156 memory_submit (mem_used, mem_lock, 0LL, mem_free);
157 /* #endif defined(HAVE_LIBKSTAT) */
159 #elif defined(HAVE_LIBSTATGRAB)
160 sg_mem_stats *ios;
162 if ((ios = sg_get_mem_stats ()) != NULL)
163 memory_submit (ios->used, 0LL, ios->cache, ios->free);
164 #endif /* HAVE_LIBSTATGRAB */
165 }
167 void module_register (void)
168 {
169 plugin_register (MODULE_NAME, memory_init, memory_read, memory_write);
170 }
172 #undef MODULE_NAME
173 #endif /* COLLECT_MEMORY */