2 * collectd - src/memory.c
3 * Copyright (C) 2005,2006 Florian octo Forster
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.
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.
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
20 * Florian octo Forster <octo at verplant.org>
27 #ifdef HAVE_MACH_KERN_RETURN_H
28 # include <mach/kern_return.h>
30 #ifdef HAVE_MACH_MACH_INIT_H
31 # include <mach/mach_init.h>
33 #ifdef HAVE_MACH_MACH_HOST_H
34 # include <mach/mach_host.h>
36 #ifdef HAVE_MACH_HOST_PRIV_H
37 # include <mach/host_priv.h>
39 #ifdef MACH_VM_STATISTICS_H
40 # include <mach/vm_statistics.h>
43 #if defined (HOST_VM_INFO) || defined(KERNEL_LINUX) || defined(HAVE_LIBKSTAT)
44 # define MEMORY_HAVE_READ 1
46 # define MEMORY_HAVE_READ 0
49 #define MODULE_NAME "memory"
51 static char *memory_file = "memory.rrd";
53 /* 9223372036854775807 == LLONG_MAX */
54 static char *ds_def[] =
56 "DS:used:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
57 "DS:free:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
58 "DS:buffers:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
59 "DS:cached:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
62 static int ds_num = 4;
64 /* vm_statistics_data_t */
65 #if defined(HOST_VM_INFO)
66 static mach_port_t port_host;
67 static vm_size_t pagesize;
68 /* #endif HOST_VM_INFO */
70 #elif defined(KERNEL_LINUX)
71 /* no global variables */
72 /* #endif KERNEL_LINUX */
74 #elif defined(HAVE_LIBKSTAT)
77 #endif /* HAVE_LIBKSTAT */
79 static void memory_init (void)
81 #if defined(HOST_VM_INFO)
82 port_host = mach_host_self ();
83 host_page_size (port_host, &pagesize);
84 /* #endif HOST_VM_INFO */
86 #elif defined(KERNEL_LINUX)
88 /* #endif KERNEL_LINUX */
90 #elif defined(HAVE_LIBKSTAT)
91 /* getpagesize(3C) tells me this does not fail.. */
92 pagesize = getpagesize ();
93 if (get_kstat (&ksp, "unix", 0, "system_pages"))
95 #endif /* HAVE_LIBKSTAT */
100 static void memory_write (char *host, char *inst, char *val)
102 rrd_update_file (host, memory_file, val, ds_def, ds_num);
107 static void memory_submit (long long mem_used, long long mem_buffered,
108 long long mem_cached, long long mem_free)
112 if (snprintf (buf, BUFSIZE, "%u:%lli:%lli:%lli:%lli",
113 (unsigned int) curtime, mem_used, mem_free,
114 mem_buffered, mem_cached) >= BUFSIZE)
117 plugin_submit (MODULE_NAME, "-", buf);
121 static void memory_read (void)
123 #if defined(HOST_VM_INFO)
124 kern_return_t status;
125 vm_statistics_data_t vm_data;
126 mach_msg_type_number_t vm_data_len;
133 if (!port_host || !pagesize)
136 vm_data_len = sizeof (vm_data) / sizeof (natural_t);
137 if ((status = host_statistics (port_host, HOST_VM_INFO,
138 (host_info_t) &vm_data,
139 &vm_data_len)) != KERN_SUCCESS)
141 syslog (LOG_ERR, "memory-plugin: host_statistics failed and returned the value %i", (int) status);
146 * From <http://docs.info.apple.com/article.html?artnum=107918>:
149 * This information can't be cached to disk, so it must stay in RAM.
150 * The amount depends on what applications you are using.
153 * This information is currently in RAM and actively being used.
156 * This information is no longer being used and has been cached to
157 * disk, but it will remain in RAM until another application needs
158 * the space. Leaving this information in RAM is to your advantage if
159 * you (or a client of your computer) come back to it later.
162 * This memory is not being used.
165 wired = vm_data.wire_count * pagesize;
166 active = vm_data.active_count * pagesize;
167 inactive = vm_data.inactive_count * pagesize;
168 free = vm_data.free_count * pagesize;
170 memory_submit (wired + active, -1, inactive, free);
171 /* #endif HOST_VM_INFO */
173 #elif defined(KERNEL_LINUX)
180 long long mem_used = 0;
181 long long mem_buffered = 0;
182 long long mem_cached = 0;
183 long long mem_free = 0;
185 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
187 syslog (LOG_WARNING, "memory: fopen: %s", strerror (errno));
191 while (fgets (buffer, 1024, fh) != NULL)
193 long long *val = NULL;
195 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
197 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
199 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
201 else if (strncasecmp (buffer, "Cached:", 7) == 0)
206 numfields = strsplit (buffer, fields, 8);
211 *val = atoll (fields[1]) * 1024LL;
215 syslog (LOG_WARNING, "memory: fclose: %s", strerror (errno));
217 if (mem_used >= (mem_free + mem_buffered + mem_cached))
219 mem_used -= mem_free + mem_buffered + mem_cached;
220 memory_submit (mem_used, mem_buffered, mem_cached, mem_free);
222 /* #endif defined(KERNEL_LINUX) */
224 #elif defined(HAVE_LIBKSTAT)
232 mem_used = get_kstat_value (ksp, "pagestotal");
233 mem_free = get_kstat_value (ksp, "pagesfree");
234 mem_lock = get_kstat_value (ksp, "pageslocked");
236 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
238 if (mem_used < (mem_free + mem_lock))
241 mem_used -= mem_free + mem_lock;
242 mem_used *= pagesize; /* If this overflows you have some serious */
243 mem_free *= pagesize; /* memory.. Why not call me up and give me */
244 mem_lock *= pagesize; /* some? ;) */
246 memory_submit (mem_used, mem_lock, 0LL, mem_free);
247 /* #endif defined(HAVE_LIBKSTAT) */
249 #elif defined(HAVE_LIBSTATGRAB)
252 if ((ios = sg_get_mem_stats ()) != NULL)
253 memory_submit (ios->used, 0LL, ios->cache, ios->free);
254 #endif /* HAVE_LIBSTATGRAB */
257 # define memory_read NULL
258 #endif /* MEMORY_HAVE_READ */
260 void module_register (void)
262 plugin_register (MODULE_NAME, memory_init, memory_read, memory_write);