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 #if defined (HOST_VM_INFO) || HAVE_SYSCTLBYNAME || KERNEL_LINUX || HAVE_LIBKSTAT
47 # define MEMORY_HAVE_READ 1
49 # define MEMORY_HAVE_READ 0
52 /* vm_statistics_data_t */
53 #if defined(HOST_VM_INFO)
54 static mach_port_t port_host;
55 static vm_size_t pagesize;
56 /* #endif HOST_VM_INFO */
58 #elif HAVE_SYSCTLBYNAME
59 /* no global variables */
60 /* #endif HAVE_SYSCTLBYNAME */
63 /* no global variables */
64 /* #endif KERNEL_LINUX */
69 #endif /* HAVE_LIBKSTAT */
72 static int memory_init (void)
74 #if defined(HOST_VM_INFO)
75 port_host = mach_host_self ();
76 host_page_size (port_host, &pagesize);
77 /* #endif HOST_VM_INFO */
79 #elif HAVE_SYSCTLBYNAME
81 /* #endif HAVE_SYSCTLBYNAME */
83 #elif defined(KERNEL_LINUX)
85 /* #endif KERNEL_LINUX */
87 #elif defined(HAVE_LIBKSTAT)
88 /* getpagesize(3C) tells me this does not fail.. */
89 pagesize = getpagesize ();
90 if (get_kstat (&ksp, "unix", 0, "system_pages"))
92 #endif /* HAVE_LIBKSTAT */
95 } /* int memory_init */
97 static void memory_submit (const char *type_instance, gauge_t value)
100 value_list_t vl = VALUE_LIST_INIT;
102 values[0].gauge = value;
106 vl.time = time (NULL);
107 strcpy (vl.host, hostname_g);
108 strcpy (vl.plugin, "memory");
109 strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
110 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
112 plugin_dispatch_values ("memory", &vl);
115 static int memory_read (void)
117 #if defined(HOST_VM_INFO)
118 kern_return_t status;
119 vm_statistics_data_t vm_data;
120 mach_msg_type_number_t vm_data_len;
127 if (!port_host || !pagesize)
130 vm_data_len = sizeof (vm_data) / sizeof (natural_t);
131 if ((status = host_statistics (port_host, HOST_VM_INFO,
132 (host_info_t) &vm_data,
133 &vm_data_len)) != KERN_SUCCESS)
135 ERROR ("memory-plugin: host_statistics failed and returned the value %i", (int) status);
140 * From <http://docs.info.apple.com/article.html?artnum=107918>:
143 * This information can't be cached to disk, so it must stay in RAM.
144 * The amount depends on what applications you are using.
147 * This information is currently in RAM and actively being used.
150 * This information is no longer being used and has been cached to
151 * disk, but it will remain in RAM until another application needs
152 * the space. Leaving this information in RAM is to your advantage if
153 * you (or a client of your computer) come back to it later.
156 * This memory is not being used.
159 wired = vm_data.wire_count * pagesize;
160 active = vm_data.active_count * pagesize;
161 inactive = vm_data.inactive_count * pagesize;
162 free = vm_data.free_count * pagesize;
164 memory_submit ("wired", wired);
165 memory_submit ("active", active);
166 memory_submit ("inactive", inactive);
167 memory_submit ("free", free);
168 /* #endif HOST_VM_INFO */
170 #elif HAVE_SYSCTLBYNAME
172 * vm.stats.vm.v_page_size: 4096
173 * vm.stats.vm.v_page_count: 246178
174 * vm.stats.vm.v_free_count: 28760
175 * vm.stats.vm.v_wire_count: 37526
176 * vm.stats.vm.v_active_count: 55239
177 * vm.stats.vm.v_inactive_count: 113730
178 * vm.stats.vm.v_cache_count: 10809
180 char *sysctl_keys[8] =
182 "vm.stats.vm.v_page_size",
183 "vm.stats.vm.v_page_count",
184 "vm.stats.vm.v_free_count",
185 "vm.stats.vm.v_wire_count",
186 "vm.stats.vm.v_active_count",
187 "vm.stats.vm.v_inactive_count",
188 "vm.stats.vm.v_cache_count",
191 double sysctl_vals[8];
196 for (i = 0; sysctl_keys[i] != NULL; i++)
199 size_t value_len = sizeof (value);
201 if (sysctlbyname (sysctl_keys[i], (void *) &value, &value_len,
204 sysctl_vals[i] = value;
205 DEBUG ("memory plugin: %26s: %6i", sysctl_keys[i], sysctl_vals[i]);
209 sysctl_vals[i] = NAN;
211 } /* for (sysctl_keys) */
213 /* multiply all all page counts with the pagesize */
214 for (i = 1; sysctl_keys[i] != NULL; i++)
215 if (!isnan (sysctl_vals[i]))
216 sysctl_vals[i] *= sysctl_vals[0];
218 memory_submit ("free", sysctl_vals[2]);
219 memory_submit ("wired", sysctl_vals[3]);
220 memory_submit ("active", sysctl_vals[4]);
221 memory_submit ("inactive", sysctl_vals[5]);
222 memory_submit ("cache", sysctl_vals[6]);
223 /* #endif HAVE_SYSCTLBYNAME */
225 #elif defined(KERNEL_LINUX)
232 long long mem_used = 0;
233 long long mem_buffered = 0;
234 long long mem_cached = 0;
235 long long mem_free = 0;
237 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
240 WARNING ("memory: fopen: %s",
241 sstrerror (errno, errbuf, sizeof (errbuf)));
245 while (fgets (buffer, 1024, fh) != NULL)
247 long long *val = NULL;
249 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
251 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
253 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
255 else if (strncasecmp (buffer, "Cached:", 7) == 0)
260 numfields = strsplit (buffer, fields, 8);
265 *val = atoll (fields[1]) * 1024LL;
271 WARNING ("memory: fclose: %s",
272 sstrerror (errno, errbuf, sizeof (errbuf)));
275 if (mem_used >= (mem_free + mem_buffered + mem_cached))
277 mem_used -= mem_free + mem_buffered + mem_cached;
278 memory_submit ("used", mem_used);
279 memory_submit ("buffered", mem_buffered);
280 memory_submit ("cached", mem_cached);
281 memory_submit ("free", mem_free);
283 /* #endif defined(KERNEL_LINUX) */
285 #elif defined(HAVE_LIBKSTAT)
293 mem_used = get_kstat_value (ksp, "pagestotal");
294 mem_free = get_kstat_value (ksp, "pagesfree");
295 mem_lock = get_kstat_value (ksp, "pageslocked");
297 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
299 if (mem_used < (mem_free + mem_lock))
302 mem_used -= mem_free + mem_lock;
303 mem_used *= pagesize; /* If this overflows you have some serious */
304 mem_free *= pagesize; /* memory.. Why not call me up and give me */
305 mem_lock *= pagesize; /* some? ;) */
307 memory_submit ("used", mem_used);
308 memory_submit ("free", mem_free);
309 memory_submit ("locked", mem_locked);
310 /* #endif defined(HAVE_LIBKSTAT) */
312 #elif defined(HAVE_LIBSTATGRAB)
315 if ((ios = sg_get_mem_stats ()) != NULL)
317 memory_submit ("used", ios->used);
318 memory_submit ("cached", ios->cached);
319 memory_submit ("free", ios->free);
321 #endif /* HAVE_LIBSTATGRAB */
325 #endif /* MEMORY_HAVE_READ */
327 void module_register (void)
330 plugin_register_init ("memory", memory_init);
331 plugin_register_read ("memory", memory_read);
332 #endif /* MEMORY_HAVE_READ */
333 } /* void module_register */