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>
47 # include <statgrab.h>
50 /* vm_statistics_data_t */
51 #if HAVE_HOST_STATISTICS
52 static mach_port_t port_host;
53 static vm_size_t pagesize;
54 /* #endif HAVE_HOST_STATISTICS */
56 #elif HAVE_SYSCTLBYNAME
57 /* no global variables */
58 /* #endif HAVE_SYSCTLBYNAME */
61 /* no global variables */
62 /* #endif KERNEL_LINUX */
67 /* #endif HAVE_LIBKSTAT */
69 #elif HAVE_LIBSTATGRAB
70 /* no global variables */
71 /* endif HAVE_LIBSTATGRAB */
74 # error "No applicable input method."
77 static int memory_init (void)
79 #if HAVE_HOST_STATISTICS
80 port_host = mach_host_self ();
81 host_page_size (port_host, &pagesize);
82 /* #endif HAVE_HOST_STATISTICS */
84 #elif HAVE_SYSCTLBYNAME
86 /* #endif HAVE_SYSCTLBYNAME */
88 #elif defined(KERNEL_LINUX)
90 /* #endif KERNEL_LINUX */
92 #elif defined(HAVE_LIBKSTAT)
93 /* getpagesize(3C) tells me this does not fail.. */
94 pagesize = getpagesize ();
95 if (get_kstat (&ksp, "unix", 0, "system_pages"))
97 #endif /* HAVE_LIBKSTAT */
100 } /* int memory_init */
102 static void memory_submit (const char *type_instance, gauge_t value)
105 value_list_t vl = VALUE_LIST_INIT;
107 values[0].gauge = value;
111 vl.time = time (NULL);
112 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
113 sstrncpy (vl.plugin, "memory", sizeof (vl.plugin));
114 strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
115 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
117 plugin_dispatch_values ("memory", &vl);
120 static int memory_read (void)
122 #if HAVE_HOST_STATISTICS
123 kern_return_t status;
124 vm_statistics_data_t vm_data;
125 mach_msg_type_number_t vm_data_len;
132 if (!port_host || !pagesize)
135 vm_data_len = sizeof (vm_data) / sizeof (natural_t);
136 if ((status = host_statistics (port_host, HOST_VM_INFO,
137 (host_info_t) &vm_data,
138 &vm_data_len)) != KERN_SUCCESS)
140 ERROR ("memory-plugin: host_statistics failed and returned the value %i", (int) status);
145 * From <http://docs.info.apple.com/article.html?artnum=107918>:
148 * This information can't be cached to disk, so it must stay in RAM.
149 * The amount depends on what applications you are using.
152 * This information is currently in RAM and actively being used.
155 * This information is no longer being used and has been cached to
156 * disk, but it will remain in RAM until another application needs
157 * the space. Leaving this information in RAM is to your advantage if
158 * you (or a client of your computer) come back to it later.
161 * This memory is not being used.
164 wired = vm_data.wire_count * pagesize;
165 active = vm_data.active_count * pagesize;
166 inactive = vm_data.inactive_count * pagesize;
167 free = vm_data.free_count * pagesize;
169 memory_submit ("wired", wired);
170 memory_submit ("active", active);
171 memory_submit ("inactive", inactive);
172 memory_submit ("free", free);
173 /* #endif HAVE_HOST_STATISTICS */
175 #elif HAVE_SYSCTLBYNAME
177 * vm.stats.vm.v_page_size: 4096
178 * vm.stats.vm.v_page_count: 246178
179 * vm.stats.vm.v_free_count: 28760
180 * vm.stats.vm.v_wire_count: 37526
181 * vm.stats.vm.v_active_count: 55239
182 * vm.stats.vm.v_inactive_count: 113730
183 * vm.stats.vm.v_cache_count: 10809
185 char *sysctl_keys[8] =
187 "vm.stats.vm.v_page_size",
188 "vm.stats.vm.v_page_count",
189 "vm.stats.vm.v_free_count",
190 "vm.stats.vm.v_wire_count",
191 "vm.stats.vm.v_active_count",
192 "vm.stats.vm.v_inactive_count",
193 "vm.stats.vm.v_cache_count",
196 double sysctl_vals[8];
200 for (i = 0; sysctl_keys[i] != NULL; i++)
203 size_t value_len = sizeof (value);
205 if (sysctlbyname (sysctl_keys[i], (void *) &value, &value_len,
208 sysctl_vals[i] = value;
209 DEBUG ("memory plugin: %26s: %6i", sysctl_keys[i], sysctl_vals[i]);
213 sysctl_vals[i] = NAN;
215 } /* for (sysctl_keys) */
217 /* multiply all all page counts with the pagesize */
218 for (i = 1; sysctl_keys[i] != NULL; i++)
219 if (!isnan (sysctl_vals[i]))
220 sysctl_vals[i] *= sysctl_vals[0];
222 memory_submit ("free", sysctl_vals[2]);
223 memory_submit ("wired", sysctl_vals[3]);
224 memory_submit ("active", sysctl_vals[4]);
225 memory_submit ("inactive", sysctl_vals[5]);
226 memory_submit ("cache", sysctl_vals[6]);
227 /* #endif HAVE_SYSCTLBYNAME */
236 long long mem_used = 0;
237 long long mem_buffered = 0;
238 long long mem_cached = 0;
239 long long mem_free = 0;
241 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
244 WARNING ("memory: fopen: %s",
245 sstrerror (errno, errbuf, sizeof (errbuf)));
249 while (fgets (buffer, 1024, fh) != NULL)
251 long long *val = NULL;
253 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
255 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
257 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
259 else if (strncasecmp (buffer, "Cached:", 7) == 0)
264 numfields = strsplit (buffer, fields, 8);
269 *val = atoll (fields[1]) * 1024LL;
275 WARNING ("memory: fclose: %s",
276 sstrerror (errno, errbuf, sizeof (errbuf)));
279 if (mem_used >= (mem_free + mem_buffered + mem_cached))
281 mem_used -= mem_free + mem_buffered + mem_cached;
282 memory_submit ("used", mem_used);
283 memory_submit ("buffered", mem_buffered);
284 memory_submit ("cached", mem_cached);
285 memory_submit ("free", mem_free);
287 /* #endif KERNEL_LINUX */
297 mem_used = get_kstat_value (ksp, "pagestotal");
298 mem_free = get_kstat_value (ksp, "pagesfree");
299 mem_lock = get_kstat_value (ksp, "pageslocked");
301 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
303 if (mem_used < (mem_free + mem_lock))
306 mem_used -= mem_free + mem_lock;
307 mem_used *= pagesize; /* If this overflows you have some serious */
308 mem_free *= pagesize; /* memory.. Why not call me up and give me */
309 mem_lock *= pagesize; /* some? ;) */
311 memory_submit ("used", mem_used);
312 memory_submit ("free", mem_free);
313 memory_submit ("locked", mem_lock);
314 /* #endif HAVE_LIBKSTAT */
316 #elif HAVE_LIBSTATGRAB
319 if ((ios = sg_get_mem_stats ()) != NULL)
321 memory_submit ("used", ios->used);
322 memory_submit ("cached", ios->cache);
323 memory_submit ("free", ios->free);
325 #endif /* HAVE_LIBSTATGRAB */
330 void module_register (void)
332 plugin_register_init ("memory", memory_init);
333 plugin_register_read ("memory", memory_read);
334 } /* void module_register */