2 * collectd - src/memory.c
3 * Copyright (C) 2005-2007 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; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian octo Forster <octo at verplant.org>
26 #ifdef HAVE_SYS_SYSCTL_H
27 # include <sys/sysctl.h>
30 #ifdef HAVE_MACH_KERN_RETURN_H
31 # include <mach/kern_return.h>
33 #ifdef HAVE_MACH_MACH_INIT_H
34 # include <mach/mach_init.h>
36 #ifdef HAVE_MACH_MACH_HOST_H
37 # include <mach/mach_host.h>
39 #ifdef HAVE_MACH_HOST_PRIV_H
40 # include <mach/host_priv.h>
42 #ifdef HAVE_MACH_VM_STATISTICS_H
43 # include <mach/vm_statistics.h>
46 /* vm_statistics_data_t */
47 #if HAVE_HOST_STATISTICS
48 static mach_port_t port_host;
49 static vm_size_t pagesize;
50 /* #endif HAVE_HOST_STATISTICS */
52 #elif HAVE_SYSCTLBYNAME
53 /* no global variables */
54 /* #endif HAVE_SYSCTLBYNAME */
57 /* no global variables */
58 /* #endif KERNEL_LINUX */
63 /* #endif HAVE_LIBKSTAT */
66 # error "No applicable input method."
69 static int memory_init (void)
71 #if HAVE_HOST_STATISTICS
72 port_host = mach_host_self ();
73 host_page_size (port_host, &pagesize);
74 /* #endif HAVE_HOST_STATISTICS */
76 #elif HAVE_SYSCTLBYNAME
78 /* #endif HAVE_SYSCTLBYNAME */
80 #elif defined(KERNEL_LINUX)
82 /* #endif KERNEL_LINUX */
84 #elif defined(HAVE_LIBKSTAT)
85 /* getpagesize(3C) tells me this does not fail.. */
86 pagesize = getpagesize ();
87 if (get_kstat (&ksp, "unix", 0, "system_pages"))
89 #endif /* HAVE_LIBKSTAT */
92 } /* int memory_init */
94 static void memory_submit (const char *type_instance, gauge_t value)
97 value_list_t vl = VALUE_LIST_INIT;
99 values[0].gauge = value;
103 vl.time = time (NULL);
104 strcpy (vl.host, hostname_g);
105 strcpy (vl.plugin, "memory");
106 strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
107 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
109 plugin_dispatch_values ("memory", &vl);
112 static int memory_read (void)
114 #if HAVE_HOST_STATISTICS
115 kern_return_t status;
116 vm_statistics_data_t vm_data;
117 mach_msg_type_number_t vm_data_len;
124 if (!port_host || !pagesize)
127 vm_data_len = sizeof (vm_data) / sizeof (natural_t);
128 if ((status = host_statistics (port_host, HOST_VM_INFO,
129 (host_info_t) &vm_data,
130 &vm_data_len)) != KERN_SUCCESS)
132 ERROR ("memory-plugin: host_statistics failed and returned the value %i", (int) status);
137 * From <http://docs.info.apple.com/article.html?artnum=107918>:
140 * This information can't be cached to disk, so it must stay in RAM.
141 * The amount depends on what applications you are using.
144 * This information is currently in RAM and actively being used.
147 * This information is no longer being used and has been cached to
148 * disk, but it will remain in RAM until another application needs
149 * the space. Leaving this information in RAM is to your advantage if
150 * you (or a client of your computer) come back to it later.
153 * This memory is not being used.
156 wired = vm_data.wire_count * pagesize;
157 active = vm_data.active_count * pagesize;
158 inactive = vm_data.inactive_count * pagesize;
159 free = vm_data.free_count * pagesize;
161 memory_submit ("wired", wired);
162 memory_submit ("active", active);
163 memory_submit ("inactive", inactive);
164 memory_submit ("free", free);
165 /* #endif HAVE_HOST_STATISTICS */
167 #elif HAVE_SYSCTLBYNAME
169 * vm.stats.vm.v_page_size: 4096
170 * vm.stats.vm.v_page_count: 246178
171 * vm.stats.vm.v_free_count: 28760
172 * vm.stats.vm.v_wire_count: 37526
173 * vm.stats.vm.v_active_count: 55239
174 * vm.stats.vm.v_inactive_count: 113730
175 * vm.stats.vm.v_cache_count: 10809
177 char *sysctl_keys[8] =
179 "vm.stats.vm.v_page_size",
180 "vm.stats.vm.v_page_count",
181 "vm.stats.vm.v_free_count",
182 "vm.stats.vm.v_wire_count",
183 "vm.stats.vm.v_active_count",
184 "vm.stats.vm.v_inactive_count",
185 "vm.stats.vm.v_cache_count",
188 double sysctl_vals[8];
192 for (i = 0; sysctl_keys[i] != NULL; i++)
195 size_t value_len = sizeof (value);
197 if (sysctlbyname (sysctl_keys[i], (void *) &value, &value_len,
200 sysctl_vals[i] = value;
201 DEBUG ("memory plugin: %26s: %6i", sysctl_keys[i], sysctl_vals[i]);
205 sysctl_vals[i] = NAN;
207 } /* for (sysctl_keys) */
209 /* multiply all all page counts with the pagesize */
210 for (i = 1; sysctl_keys[i] != NULL; i++)
211 if (!isnan (sysctl_vals[i]))
212 sysctl_vals[i] *= sysctl_vals[0];
214 memory_submit ("free", sysctl_vals[2]);
215 memory_submit ("wired", sysctl_vals[3]);
216 memory_submit ("active", sysctl_vals[4]);
217 memory_submit ("inactive", sysctl_vals[5]);
218 memory_submit ("cache", sysctl_vals[6]);
219 /* #endif HAVE_SYSCTLBYNAME */
221 #elif defined(KERNEL_LINUX)
228 long long mem_used = 0;
229 long long mem_buffered = 0;
230 long long mem_cached = 0;
231 long long mem_free = 0;
233 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
236 WARNING ("memory: fopen: %s",
237 sstrerror (errno, errbuf, sizeof (errbuf)));
241 while (fgets (buffer, 1024, fh) != NULL)
243 long long *val = NULL;
245 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
247 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
249 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
251 else if (strncasecmp (buffer, "Cached:", 7) == 0)
256 numfields = strsplit (buffer, fields, 8);
261 *val = atoll (fields[1]) * 1024LL;
267 WARNING ("memory: fclose: %s",
268 sstrerror (errno, errbuf, sizeof (errbuf)));
271 if (mem_used >= (mem_free + mem_buffered + mem_cached))
273 mem_used -= mem_free + mem_buffered + mem_cached;
274 memory_submit ("used", mem_used);
275 memory_submit ("buffered", mem_buffered);
276 memory_submit ("cached", mem_cached);
277 memory_submit ("free", mem_free);
279 /* #endif defined(KERNEL_LINUX) */
281 #elif defined(HAVE_LIBKSTAT)
289 mem_used = get_kstat_value (ksp, "pagestotal");
290 mem_free = get_kstat_value (ksp, "pagesfree");
291 mem_lock = get_kstat_value (ksp, "pageslocked");
293 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
295 if (mem_used < (mem_free + mem_lock))
298 mem_used -= mem_free + mem_lock;
299 mem_used *= pagesize; /* If this overflows you have some serious */
300 mem_free *= pagesize; /* memory.. Why not call me up and give me */
301 mem_lock *= pagesize; /* some? ;) */
303 memory_submit ("used", mem_used);
304 memory_submit ("free", mem_free);
305 memory_submit ("locked", mem_lock);
306 /* #endif defined(HAVE_LIBKSTAT) */
308 #elif defined(HAVE_LIBSTATGRAB)
311 if ((ios = sg_get_mem_stats ()) != NULL)
313 memory_submit ("used", ios->used);
314 memory_submit ("cached", ios->cached);
315 memory_submit ("free", ios->free);
317 #endif /* HAVE_LIBSTATGRAB */
322 void module_register (void)
324 plugin_register_init ("memory", memory_init);
325 plugin_register_read ("memory", memory_read);
326 } /* void module_register */