2 * collectd - src/memory.c
3 * Copyright (C) 2005 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 /* TODO #include <mach/vm-stuff*> */
28 #ifdef HAVE_MACH_KERN_RETURN_H
29 # include <mach/kern_return.h>
31 #ifdef HAVE_MACH_MACH_INIT_H
32 # include <mach/mach_init.h>
34 #ifdef HAVE_MACH_HOST_PRIV_H
35 # include <mach/host_priv.h>
38 #if defined (HOST_VM_INFO) || defined(KERNEL_LINUX) || defined(HAVE_LIBKSTAT)
39 # define MEMORY_HAVE_READ 1
41 # define MEMORY_HAVE_READ 0
44 #define MODULE_NAME "memory"
46 static char *memory_file = "memory.rrd";
48 /* 9223372036854775807 == LLONG_MAX */
49 static char *ds_def[] =
51 "DS:used:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
52 "DS:free:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
53 "DS:buffers:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
54 "DS:cached:GAUGE:"COLLECTD_HEARTBEAT":0:9223372036854775807",
57 static int ds_num = 4;
59 /* vm_statistics_data_t */
60 #if defined(HOST_VM_INFO)
61 static mach_port_t port_host;
62 static vm_size_t pagesize;
63 /* #endif HOST_VM_INFO */
65 #elif defined(KERNEL_LINUX)
66 /* no global variables */
67 /* #endif KERNEL_LINUX */
69 #elif defined(HAVE_LIBKSTAT)
72 #endif /* HAVE_LIBKSTAT */
74 static void memory_init (void)
76 #if defined(HOST_VM_INFO)
77 port_host = mach_host_self ();
78 host_page_size(port_host, &pagesize);
79 /* #endif HOST_VM_INFO */
81 #elif defined(KERNEL_LINUX)
83 /* #endif KERNEL_LINUX */
85 #elif defined(HAVE_LIBKSTAT)
86 /* getpagesize(3C) tells me this does not fail.. */
87 pagesize = getpagesize ();
88 if (get_kstat (&ksp, "unix", 0, "system_pages"))
90 #endif /* HAVE_LIBKSTAT */
95 static void memory_write (char *host, char *inst, char *val)
97 rrd_update_file (host, memory_file, val, ds_def, ds_num);
102 static void memory_submit (long long mem_used, long long mem_buffered,
103 long long mem_cached, long long mem_free)
107 if (snprintf (buf, BUFSIZE, "%u:%lli:%lli:%lli:%lli",
108 (unsigned int) curtime, mem_used, mem_free,
109 mem_buffered, mem_cached) >= BUFSIZE)
112 plugin_submit (MODULE_NAME, "-", buf);
116 static void memory_read (void)
118 #if defined(HOST_VM_INFO)
119 kern_return_t status;
120 vm_statistics_data_t vm_data;
121 mach_msg_type_number_t vm_data_len;
128 if (!port_host || !pagesize)
131 vm_data_len = sizeof (vm_data) / sizeof (natural_t);
132 if ((status = host_statistics (port_host, HOST_VM_INFO,
133 (host_info_t) &vm_data,
134 &vm_data_len)) != KERN_SUCCESS)
136 syslog (LOG_ERR, "memory-plugin: host_statistics failed and returned the value %i", (int) status);
141 * From <http://docs.info.apple.com/article.html?artnum=107918>:
144 * This information can't be cached to disk, so it must stay in RAM.
145 * The amount depends on what applications you are using.
148 * This information is currently in RAM and actively being used.
151 * This information is no longer being used and has been cached to
152 * disk, but it will remain in RAM until another application needs
153 * the space. Leaving this information in RAM is to your advantage if
154 * you (or a client of your computer) come back to it later.
157 * This memory is not being used.
160 wired = vm_data.wire_count * pagesize;
161 active = vm_data.active_count * pagesize;
162 inactive = vm_data.inactive_count * pagesize;
163 free = vm_stat.free_count * pagesize;
165 memory_submit (wired + active, -1, inactive, free);
166 /* #endif HOST_VM_INFO */
168 #elif defined(KERNEL_LINUX)
175 long long mem_used = 0;
176 long long mem_buffered = 0;
177 long long mem_cached = 0;
178 long long mem_free = 0;
180 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
182 syslog (LOG_WARNING, "memory: fopen: %s", strerror (errno));
186 while (fgets (buffer, 1024, fh) != NULL)
188 long long *val = NULL;
190 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
192 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
194 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
196 else if (strncasecmp (buffer, "Cached:", 7) == 0)
201 numfields = strsplit (buffer, fields, 8);
206 *val = atoll (fields[1]) * 1024LL;
210 syslog (LOG_WARNING, "memory: fclose: %s", strerror (errno));
212 if (mem_used >= (mem_free + mem_buffered + mem_cached))
214 mem_used -= mem_free + mem_buffered + mem_cached;
215 memory_submit (mem_used, mem_buffered, mem_cached, mem_free);
217 /* #endif defined(KERNEL_LINUX) */
219 #elif defined(HAVE_LIBKSTAT)
227 mem_used = get_kstat_value (ksp, "pagestotal");
228 mem_free = get_kstat_value (ksp, "pagesfree");
229 mem_lock = get_kstat_value (ksp, "pageslocked");
231 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
233 if (mem_used < (mem_free + mem_lock))
236 mem_used -= mem_free + mem_lock;
237 mem_used *= pagesize; /* If this overflows you have some serious */
238 mem_free *= pagesize; /* memory.. Why not call me up and give me */
239 mem_lock *= pagesize; /* some? ;) */
241 memory_submit (mem_used, mem_lock, 0LL, mem_free);
242 /* #endif defined(HAVE_LIBKSTAT) */
244 #elif defined(HAVE_LIBSTATGRAB)
247 if ((ios = sg_get_mem_stats ()) != NULL)
248 memory_submit (ios->used, 0LL, ios->cache, ios->free);
249 #endif /* HAVE_LIBSTATGRAB */
252 # define memory_read NULL
253 #endif /* MEMORY_HAVE_READ */
255 void module_register (void)
257 plugin_register (MODULE_NAME, memory_init, memory_read, memory_write);